JP5969268B2 - Geothermal heat pump device - Google Patents

Description

  The present invention relates to a geothermal heat pump that collects geothermal heat and performs air conditioning and the like.

  In recent years, in order to prevent global warming, an apparatus in which a refrigeration cycle apparatus that circulates a refrigerant by a compressor is combined with a geothermal heat collecting apparatus that uses geothermal heat has been developed. This device is configured by circulating a heat medium such as water or brine between the underground heat collection pipe buried in the ground and the use side heat exchanger provided indoors, etc. The heat medium cooled by radiating heat into the ground with the heat heat collection pipe absorbs heat from the air ventilated to the use side heat exchanger, thereby exerting a cooling action (cooling).

  Further, during heating, the heat medium absorbs heat in the evaporator of the refrigeration cycle apparatus, so that the underground heat is used for heating (for example, see Patent Document 1 and Patent Document 2). This is particularly effective in the winter in cold regions where the underground temperature is higher than the outside air temperature.

JP-A-2005-106384 JP 2010-216783 A

  However, in the above-mentioned Patent Document 1, the refrigeration cycle apparatus and the geothermal heat collecting apparatus using the geothermal heat exchange heat only with the evaporator of the refrigeration cycle apparatus, and in Patent Document 2, the evaporator of the refrigeration cycle apparatus during heating. Since the heat exchange is performed only with the condenser of the refrigeration cycle apparatus at the time of cooling (both are heat-use heat exchangers 31), there is a problem that the underground heat cannot be effectively used for the refrigeration cycle apparatus. Further improvement in operating efficiency, cooling and heating performance has been desired.

  The present invention has been made to solve the conventional technical problems, and provides a heat pump device using geothermal heat capable of improving operation efficiency and performance by effectively using geothermal heat. Is.

In order to solve the above-described problems, a heat pump device using ground heat according to the invention of claim 1 includes a compressor, a radiator, an expansion mechanism, a refrigeration cycle device having a refrigerant circuit including an evaporator, It was installed in a heat exchange relationship with a buried underground heat collection tube, a ground heat transfer device provided in a heat exchange relationship with an evaporator, a use side heat exchanger for air conditioning, and a heat sink. User side heat exchangers, these underground heat collection tubes, underground heat exchangers, user side heat exchangers, heat medium circulation devices that control the flow of heat medium to the user side heat exchangers, and refrigeration The control device controls the cycle device and the heat medium circulation device, and the control device is configured by the heat medium circulation device to use the underground heat collection pipe, the underground heat transfer device, the use side heat exchanger, and the use side transfer. The heat medium is circulated in the order of the heater .

  According to a second aspect of the present invention, there is provided a heat pump device using ground heat, a compressor, a radiator, an expansion mechanism, a refrigeration cycle device having a refrigerant circuit including an evaporator, and underground heat embedded in the ground. A heat collection tube, a ground heat exchanger provided in a heat exchange relationship with the evaporator, a use side heat exchanger for performing air conditioning, and a use side heat exchanger provided in a heat exchange relationship with the radiator. , These underground heat collection tubes, underground heat exchangers, use side heat exchangers, heat medium circulation devices that control the flow of the heat medium to the use side heat transfer devices, refrigeration cycle devices, and heat medium circulations And a control device for controlling the device. The control device circulates the heat medium between the geothermal heat collecting pipe and the geothermal heat exchanger by the heat medium circulation device, and uses the heat exchanger with the use side heat exchanger. Ground heat collection using the first operation mode for circulating the heat medium to and from the side heat exchanger and the heat medium circulating device , Underground heat heat transfer device, the usage-side heat exchanger, and characterized by having a second operating mode for circulating the heat medium in the order of the usage-side heat transfer unit.

  According to a third aspect of the present invention, there is provided a heat pump device using ground heat, a compressor, a radiator, an expansion mechanism, a refrigeration cycle device having a refrigerant circuit including an evaporator, and underground heat embedded in the ground. The heat collection tube, the underground heat exchanger provided in a heat exchange relationship with the evaporator, the first and second use side heat exchangers for air conditioning, and the heat exchanger provided in a heat exchange relationship A heat transfer device that controls the flow of the heat medium to the use side heat transfer device, and these underground heat collection tubes, the underground heat transfer device, the two use side heat exchangers, and the use side heat transfer device, A control device for controlling the refrigeration cycle device and the heat medium circulation device is provided. The control device circulates the heat medium between the underground heat collection pipe and the underground heat transfer device by the heat medium circulation device, A first operation mode for circulating a heat medium between the first user-side heat exchanger and the user-side heat exchanger, and heat medium circulation; It has the 2nd operation mode which circulates a heat carrier in order of a geothermal heat collection pipe, a geothermal heat exchanger, a 2nd use side heat exchanger, and a use side heat exchanger. And

  According to a fourth aspect of the present invention, there is provided a ground heat utilization heat pump device according to the first aspect, wherein the control device diverts a part of the heat medium exiting the utilization side heat transfer device by the heat medium circulation device. After flowing through the side heat exchanger, it has a third operation mode in which the second utilization side heat exchanger is joined to the heat medium that has exited.

  The ground heat utilization heat pump device of the invention of claim 5 is provided for the first compressor and the first radiator, the expansion mechanism, the evaporator, the first compressor and the first radiator. And a refrigeration cycle apparatus having a refrigerant circuit including a second compressor and a second radiator provided in a high-level side of the two-way connection or a rear-stage side of the two-stage connection, and embedded in the ground A heat exchanging tube, a geothermal heat exchanger provided in a heat exchange relationship with the evaporator, a use side heat exchanger for air conditioning, and a first heat radiator. The first use side heat transfer device, the second use side heat transfer device provided in a heat exchange relationship with the second heat radiator, and these underground heat collection tubes, the underground heat transfer device, and the use side Heat exchanger, first use side heat transfer device, heat medium circulation device for controlling circulation of heat medium to second use side heat transfer device, refrigeration cycle device, and heat medium A control device for controlling the ring device, and the control device circulates the heat medium between the geothermal heat collecting pipe and the geothermal heat exchanger by the heat medium circulation device, The first operation mode in which the heat medium is circulated between the first and second user-side heat exchangers and the heat medium circulating device, the underground heat collection pipe, the underground heat exchanger, and the user-side heat exchange. And a second operation mode in which the heat medium is circulated in the order of the heat exchanger and the first user-side heat exchanger.

  The ground heat utilization heat pump device of the invention of claim 6 relates to the first compressor and the first radiator, the expansion mechanism, the evaporator, the first compressor and the first radiator. And a refrigeration cycle apparatus having a refrigerant circuit including a second compressor and a second radiator provided in a high-level side of the two-way connection or a rear-stage side of the two-stage connection, and embedded in the ground Underground heat collection tubes, underground heat exchangers provided in a heat exchange relationship with the evaporator, first and second use side heat exchangers for air conditioning, and first for performing hot water supply 3 utilization side heat exchangers, a first utilization side heat exchanger provided in a heat exchange relationship with the first radiator, and a second utilization side provided in a heat exchange relationship with the second radiator. Heat transfer devices, heat transfer pipes to these underground heat collection tubes, underground heat transfer devices, each use-side heat exchanger, first use-side heat transfer device, and second use-side heat transfer device Flow And a control device for controlling the refrigeration cycle device and the heat medium circulation device. The control device uses the heat medium circulation device to connect the underground heat collection pipe and the underground heat transfer device. The first heat medium is circulated between the first utilization side heat exchanger and the third utilization side heat exchanger, and the first and second utilization side heat exchangers. Circulate the heat medium in the order of the operation mode and the underground heat collection pipe, the underground heat exchanger, the second usage side heat exchanger, and the second usage side heat exchanger by the heat medium circulation device; And it has the 2nd operation mode which circulates a heat carrier between the 3rd use side heat exchanger and the 1st use side heat exchanger, It is characterized by the above-mentioned.

According to a seventh aspect of the present invention, there is provided a heat pump device using ground heat, wherein the refrigerant flowing through the evaporator and the heat medium flowing through the ground heat transfer device are opposed to each other, and the refrigerant flowing through the radiator and the use-side transmission Heat medium flowing through the heater, refrigerant flowing through the first radiator and heat medium flowing through the first user-side heat exchanger, refrigerant flowing through the second radiator, and second user-side heat exchanger The heat medium flowing through is a counter flow.

Moreover, the heat pump apparatus using the ground heat according to the invention of claim 8 is the above-mentioned invention, wherein the control device is a ground heat collection pipe, a ground heat heat exchanger, a use side heat exchanger, and a use side heat exchanger. One of the cooling load, temperature, humidity, outside air temperature, humidity, or a combination thereof , or the air-conditioned space in the second operation mode in a state where the heat medium is circulated in this order The operation of the refrigeration cycle apparatus is controlled based on one of cooling load, temperature, humidity, outside air temperature, humidity, or a combination thereof.

Moreover, the heat pump apparatus using the ground heat according to the invention of claim 9 is the above-mentioned invention, wherein the control device is a ground heat collection pipe, a ground heat heat exchanger, a use side heat exchanger, and a use side heat exchanger. in the state for circulating the heat medium in the order, or, in a second operating mode, characterized by having a control state of stopping the refrigerating cycle apparatus.

  A ground heat utilization heat pump device according to a tenth aspect of the present invention is characterized in that, in each of the above inventions, carbon dioxide is sealed as a refrigerant in the refrigerant circuit of the refrigeration cycle apparatus.

According to the ground heat utilization heat pump device of the present invention, a compressor, a radiator, an expansion mechanism, a refrigeration cycle device having a refrigerant circuit including an evaporator, and a underground heat collection pipe buried in the ground, , evaporator and the underground heat heat transfer device provided in heat exchange relation, the utilization-side heat exchanger for performing air conditioning and, radiator and the usage-side heat transfer unit provided in the heat exchange relationship, these locations Medium heat collection tube, underground heat exchanger, use side heat exchanger, heat medium circulation device for controlling the flow of heat medium to the use side heat transfer device, control of the refrigeration cycle device and the heat medium circulation device The control device is provided with a heat medium circulation device, and the heat medium is arranged in the order of the underground heat collection pipe, the underground heat transfer device, the use side heat exchanger, and the use side heat transfer device. In the ground, especially when performing cooling (second operation mode) with the use side heat exchanger. The heat medium radiated into the ground through the heat collection pipe flows into the underground heat exchanger, exchanges heat with the evaporator of the refrigeration cycle device, and further cools by the evaporator, and then flows into the use side heat exchanger. Will do. Thereby, the cooling performance by the utilization side heat exchanger can be improved.

  The heat medium that has exited the use side heat exchanger then flows into the use side heat exchanger, heat exchanges with the radiator of the refrigeration cycle device, and after the temperature rises, returns to the underground heat collection pipe again. Also, heat exchange efficiency in the ground is improved.

  On the other hand, the refrigerant in the refrigeration cycle device dissipates heat to the heat medium flowing through the use side heat transfer device with a radiator, and then is squeezed by an expansion mechanism and flows into the evaporator and flows through the underground heat transfer device. Since the circulation of absorbing heat from the medium is repeated, the operation efficiency of the refrigeration cycle apparatus is also improved.

  As a result, according to the heat pump device using ground heat of the present invention, it is possible to realize a cooling operation with extremely high performance with high efficiency.

  According to the invention of claim 2, the control device circulates the heat medium between the underground heat collection pipe and the underground heat transfer device by the heat medium circulation device, and the use side heat exchanger and the use side. The first operation mode for circulating the heat medium to and from the heat transfer unit and the heat medium circulation device, the underground heat collection pipe, the underground heat transfer unit, the use side heat exchanger, and the use side heat transfer If there is a second operation mode in which the heat medium is circulated in the order of the coolers, the cooling operation as described above is executed by the use side heat exchanger in the second operation mode, and the first operation mode Then, the heat sucked up by the underground heat collection pipe is transferred to the underground heat transfer device by the heat medium and transferred to the evaporator of the refrigeration cycle apparatus, and this heat is further passed through the refrigerant to the radiator of the refrigeration cycle apparatus. And can be sucked up by the heat medium flowing through the use side heat transfer device.

  Thereby, it becomes possible to realize highly efficient heating operation and hot water supply operation using geothermal heat in the first operation mode with high efficiency.

  In this case, the first and second use side heat exchangers for air conditioning are provided as in the invention of claim 3, and the control device uses the heat medium circulation device to provide the underground heat collection pipe and the underground heat transfer. A first operation mode in which the heat medium is circulated between the heat exchanger and the heat medium is circulated between the first user-side heat exchanger and the user-side heat exchanger; It is good also as having the 2nd operation mode which circulates a heat carrier in order of a heat heat collection pipe, a subsurface heat exchanger, a 2nd use side heat exchanger, and a use side heat exchanger. In that case, heating operation or hot water supply operation is performed in the first use side heat exchanger, and cooling operation is performed in the second use side heat exchanger.

  Further, at that time, after the control device, like the invention of claim 4, divides a part of the heat medium that has exited the use side heat exchanger by the heat medium circulation device, it flows to the first use side heat exchanger. If it has the 3rd operation mode which joins the heat medium which came out of the 2nd use side heat exchanger, it will be the 1st use side heat exchanger while cooling with the 2nd use side heat exchanger. Thus, it is possible to realize a so-called dehumidifying operation in which heating is performed.

  Further, as in the invention of claim 5, the refrigeration cycle apparatus is provided with respect to the first compressor and the first radiator, the expansion mechanism, the evaporator, the first compressor and the first radiator. It has a refrigerant circuit including a second compressor and a second radiator provided in a high-side side of the original connection or a rear-stage side of the two-stage connection, and has a heat exchange relationship with the first radiator. A first use side heat transfer device provided in the second heat sink and a second use side heat transfer device provided in a heat exchange relationship with the second heat dissipator. A first operation for circulating the heat medium between the heat collection tube and the underground heat exchanger and circulating the heat medium between the use side heat exchanger and the first and second use side heat exchangers The heat medium is circulated in the order of the underground heat collection tube, the underground heat transfer device, the use side heat exchanger, and the first use side heat transfer device by the mode and the heat transfer device. If the second operation mode is selected, carbon dioxide, which is a natural refrigerant, is used as the refrigerant of the refrigeration cycle apparatus as in the invention of claim 10, and the high pressure side of the refrigerant circuit of the refrigeration cycle apparatus is set to a supercritical pressure or higher. It is particularly effective when used.

  According to the sixth aspect of the present invention, a third usage-side heat exchanger for performing hot water supply is provided as in the invention of claim 6, and the control device uses a heat medium circulation device to connect the underground heat collection pipe and the underground heat exchanger. The first heat medium is circulated between the first utilization side heat exchanger and the third utilization side heat exchanger, and the first and second utilization side heat exchangers. Circulate the heat medium in the order of the operation mode and the underground heat collection pipe, the underground heat exchanger, the second usage side heat exchanger, and the second usage side heat exchanger by the heat medium circulation device; The same applies to the case where the second operation mode in which the heat medium is circulated between the third user-side heat exchanger and the first user-side heat exchanger is provided. In this case, hot water can be supplied in the third usage-side heat exchanger while cooling in the second usage-side heat exchanger.

In addition, the refrigerant flowing through the evaporator and the heat medium flowing through the underground heat exchanger are opposed to each other as in the invention of claim 7, and the refrigerant flowing through the radiator and the heat medium flowing through the user-side heat exchanger , or the first The refrigerant flowing through the radiator and the heat medium flowing through the first use-side heat transfer device, or the refrigerant flowing through the second heat radiator and the heat medium flowing through the second use-side heat transfer device are opposed to each other. By doing so, it is possible to increase the refrigerant temperature difference at the inlet and outlet of the evaporator , radiator, first radiator, or second radiator, and further improve the refrigeration capacity and operating efficiency. It becomes possible.

Further, as in the invention of claim 8, the control device is in a state in which the heat medium is circulated in the order of the underground heat collection pipe, the underground heat exchanger, the use side heat exchanger, and the use side heat exchanger. Cooling load, temperature, humidity, outside air temperature, humidity in the air-conditioned space, or a combination thereof , or cooling load, temperature, humidity, outside air temperature in the air-conditioned space in the second operation mode If the operation of the refrigeration cycle apparatus is controlled based on one of the humidity or a combination thereof, the refrigeration cycle apparatus is appropriately operated according to the season and environment, and an efficient heat pump operation is performed. It can be realized.

In this case, in particular, as in the ninth aspect of the invention, the control device circulates the heat medium in the order of the underground heat collection tube, the underground heat transfer device, the use side heat exchanger, and the use side heat transfer device. in, or, in a second operating mode, when to have a control state of stopping the refrigeration cycle apparatus, unnecessary the operation of the refrigeration cycle apparatus, for example in spring or autumn stop the refrigeration cycle device ground It is also possible to realize cooling and heating only by heat.

It is a block diagram (2nd operation mode) of one Example of the geothermal heat utilization heat pump apparatus to which this invention is applied (Example 1). It is a block diagram explaining the 1st operation mode of the geothermal heat utilization heat pump apparatus of FIG. It is a flowchart explaining the example of control by the control apparatus of the geothermal heat utilization heat pump apparatus of FIG. It is a block diagram which shows the state which stopped the refrigerating-cycle apparatus with the geothermal heat utilization heat pump apparatus of FIG. (Example 2) which is the block diagram explaining the other example of control in the 2nd operation mode of the geothermal heat utilization heat pump apparatus of FIG. It is a flowchart explaining the example of control by the control apparatus in FIG. FIG. 12 is a configuration diagram illustrating still another control example in the second operation mode of the geothermal heat pump device of FIG. 1 (Example 3). It is a flowchart explaining the example of control by the control apparatus in FIG. (Example 4) which is a figure which shows the other structural example of the geothermal heat utilization heat pump apparatus of FIG. It is a block diagram (2nd operation mode, 3rd operation mode) of the other Example of the geothermal heat utilization heat pump apparatus to which this invention is applied (Example 5). It is a block diagram explaining the 1st operation mode of the geothermal heat utilization heat pump apparatus of FIG. It is a block diagram (2nd operation mode) of other Example of the geothermal heat utilization heat pump apparatus to which this invention is applied (Example 6). It is a block diagram explaining the 1st operation mode of the geothermal heat utilization heat pump apparatus of FIG. It is a block diagram (2nd operation mode) of other Example of the geothermal heat utilization heat pump apparatus to which this invention is applied (Example 7). It is a block diagram explaining the 1st operation mode of the geothermal heat utilization heat pump apparatus of FIG. FIG. 14 is a ph diagram of the geothermal heat pump device of FIGS. 12 and 13 (Example 6).

  Hereinafter, embodiments of the present invention will be described in detail.

  1, 2, and 4 show a configuration diagram of a geothermal heat pump device 1 according to an embodiment of the present invention, and FIG. 3 shows a flowchart of a control example. In each figure, the geothermal heat pump device 1 is composed of a refrigeration cycle device 2, a geothermal heat collecting device 3, and a control device 4 for controlling them.

  The refrigeration cycle apparatus 2 includes a refrigerant circuit 10 in which a compressor 6, a radiator (gas cooler) 7, an expansion mechanism (electronic expansion valve) 8, and an evaporator 9 are sequentially connected in a ring shape by a pipe 11. In the refrigerant circuit 10, carbon dioxide is sealed as a refrigerant in the embodiment.

  The geothermal heat collecting device 3 includes a geothermal heat collecting pipe 12 embedded in the ground, a geothermal heat transfer device 13 provided in a heat exchange relationship with the evaporator 9, a circulation pump 14, A three-way valve (channel control means) 16, a use side heat exchanger 17 for air conditioning provided in an air-conditioned space such as a house interior, and a use side transmission provided in a heat exchange relationship with the radiator 7. A heater 18, a three-way valve (flow path control means) 19, and another circulation pump 21 are provided, and the underground heat collection pipe 12, the underground heat transfer device 13, the circulation pump 14, and the three-way A second outlet 16B of the valve 16 is annularly connected by a pipe 22, and a use side heat exchanger 17, a use side heat exchanger 18, a second outlet 19B of the three-way valve 19, and a circulation pump 21 are piped. 23 is connected in a ring shape.

  Furthermore, the piping 23 between the circulation pump 21 and the use side heat exchanger 17 and the first outlet 16A of the three-way valve 16 are connected by a bypass pipe 24, and the second outlet 16B of the three-way valve 16 and the underground The pipe 22 between the heat collecting pipe 12 and the first outlet 19 </ b> A of the three-way valve 19 are connected by another bypass pipe 26. The circulation pumps 14 and 21, the three-way valves 16 and 19, the pipes 22 and 23, and the bypass pipes 24 and 26 constitute a heat medium circulation device 27 in the present invention. In the geothermal heat collecting device 3, water or brine is sealed as a heat medium in the embodiment.

  Moreover, the control apparatus 4 is comprised by the general purpose microcomputer, The compressor 6, the expansion mechanism 8, each circulation pump 14, 21 and the three-way valves 16 and 19 are connected to the output. Further, the input of the control device 4 includes a discharge temperature sensor 28 that detects a discharge temperature (discharge refrigerant temperature) of the compressor 6, and an indoor temperature sensor 29 that detects an indoor temperature (indoor temperature) that is an air-conditioned space. The outside air temperature sensor 30 for detecting the outside air temperature and the heat medium inlet temperature sensor 31 for detecting the heat medium inlet temperature of the use side heat exchanger 17 are connected. Based on the temperatures detected by these sensors 28 to 31 and the command input (mode switching, indoor set temperature, etc.), the control device 4 determines the rotational speeds of the compressor 6 and the circulation pumps 14 and 21 and opens the expansion mechanism 8. The three-way valves 16 and 19 are switched by controlling the degree.

  Next, the operation of the heat pump apparatus 1 using the underground heat according to the present invention will be described. First, the cooling operation (second operation mode) of the geothermal heat pump device 1 will be described with reference to the flowchart of FIG. For example, when the cooling operation (second operation mode) is started by a command input from a mode changeover switch (not shown) from spring to summer, the control device 4 controls the three-way valves 16 and 19 to control the first Open outlets 16A, 19A. Further, in step S1 in FIG. 3, the outside temperature or the room temperature detected by the outside temperature sensor 30 or the room temperature sensor 29 is detected, and a difference (temperature difference) from the indoor set temperature as the air-conditioned space is calculated.

  And the control apparatus 4 judges whether the difference (temperature difference) calculated by step S2 is 10 degreeC or more. For example, if the difference (temperature difference) is 10 ° C. or more in summer, for example, the control device 4 determines that the indoor cooling load is large and proceeds to step S3. In this step S3, the cooling operation (cooling in the HP operation) for operating the compressor 6 of the refrigeration cycle apparatus 2 is performed, and in step S4, the rotational speed and discharge temperature of the compressor 6 are set by the difference (temperature difference). To do. That is, when the difference (temperature difference) is large and the cooling load is larger, the rotation speed of the compressor 6 is increased and the set discharge temperature is also increased, thereby increasing the refrigeration capacity of the refrigeration cycle apparatus 2. Conversely, if the difference (temperature difference) is 10 ° C. or more, but is relatively small, the refrigerating capacity of the refrigeration cycle apparatus 2 is reduced by lowering the rotational speed and the set discharge temperature. Further, the control device 4 controls the valve opening degree of the expansion mechanism 8 so that the discharge temperature of the compressor 6 detected by the discharge temperature sensor 28 in step S5 becomes the set discharge temperature.

  Further, the control device 4 sets the target heat medium inlet temperature based on the difference (temperature difference) in step S6, and the heat medium inlet temperature of the use side heat exchanger 17 detected by the heat medium inlet temperature sensor 31 is the target heat medium. The number of rotations of the circulation pump 14 is controlled so as to reach the inlet temperature (the circulation pump 21 is stopped). That is, when the temperature of the heat medium flowing into the use side heat exchanger 17 detected by the heat medium inlet temperature sensor 31 (heat medium inlet temperature) is higher than the target heat medium inlet temperature and the difference is large, the circulation pump 14 Reduce the speed.

  When the compressor 6 of the refrigeration cycle apparatus 2 is operated, the supercritical carbon dioxide refrigerant discharged from the compressor 6 flows into the radiator 7, where it dissipates heat and reaches the expansion mechanism 8, where liquid / gas mixing occurs. It enters a state and flows into the evaporator 9. Therefore, the refrigerant evaporates to exhibit an endothermic effect, and repeats circulation that is sucked into the compressor 6.

  On the other hand, when the circulation pump 14 of the geothermal heat collecting device 3 is operated, the geothermal heat collecting pipe 12 radiates heat to the ground at a temperature of, for example, about 15 ° C. (that is, is cooled in the ground) to 40 ° C. However, the heat medium whose temperature has dropped to about 20 ° C. is sucked from the underground heat collecting pipe 12 and flows into the underground heat exchanger 13 through the pipe 22. Here, heat is radiated to the evaporator 9 of the refrigeration cycle device 2 (the evaporator 9 absorbs heat) and further cooled to about 7 ° C., passes through the bypass pump 24 and the three-way valve 16, passes through the bypass pipe 24, and uses-side heat exchange. Flows into the vessel 17.

  Since indoor air is circulated by a blower (not shown) in the usage-side heat exchanger 17, the heat medium flowing into the usage-side heat exchanger 17 absorbs heat from the indoor air and rises to about 12 ° C. On the other hand, since the indoor air is cooled by the heat medium, the room (the air-conditioned space) is cooled. The heat medium exiting from the use side heat exchanger 17 then enters the use side heat exchanger 18. Since the refrigerant of about 70 ° C. flows into the radiator 7 of the refrigeration cycle apparatus 2, the heat medium passing through the use side heat transfer device 18 absorbs heat, and the refrigerant passing through the radiator 7 is cooled. Then, the refrigerant is cooled to about 15 ° C., flows out of the radiator 7, and goes to the expansion mechanism 8. The temperature of the heat medium rises to about 40 ° C., passes through the three-way valve 19 and the bypass pipe 26, and returns to the underground heat collection pipe 12. In the geothermal heat collecting pipe 12, the heat medium again radiates heat into the ground (about 15 ° C.) and repeats circulation toward the underground heat exchanger 13.

  Thus, the heat medium radiated into the ground by the underground heat collecting pipe 12 of the underground heat collecting device 3 flows into the underground heat transfer device 13 and exchanges heat with the evaporator 9 of the refrigeration cycle device 2. After being further cooled by the evaporator 9, it flows into the use side heat exchanger 17, so that the cooling performance by the use side heat exchanger 17 can be improved. Then, the heat medium that has exited the use side heat exchanger 17 flows into the use side heat transfer device 18 and exchanges heat with the radiator 7 of the refrigeration cycle apparatus 2 to increase the temperature. Since it returns to the heat pipe 12, the heat exchange efficiency in the ground is also improved.

  On the other hand, the refrigerant of the refrigeration cycle apparatus 2 dissipates heat to the heat medium flowing through the use side heat transfer device 18 by the radiator 7, and then is squeezed by the expansion mechanism 8 and flows into the evaporator 9 to enter the underground heat transfer. Since the circulation of absorbing heat from the heat medium flowing through the heater 9 is repeated, the operation efficiency of the refrigeration cycle apparatus 2 is also improved. Accordingly, the geothermal heat pump device 1 can achieve highly efficient cooling operation with high efficiency.

  On the other hand, if the difference (temperature difference) between the outside air temperature or the room temperature and the room set temperature is less than 10 ° C. in the spring, the control device 4 determines that the cooling load is small and proceeds from step S2 to step S7. In this step S7, as shown in FIG. 4, the compressor 6 of the refrigeration cycle apparatus 2 is stopped and the cooling operation (cooling with underground cooling) is performed by cooling only with the underground heat, and the difference ( The rotational speed of the circulation pump 14 is determined and controlled by the temperature difference (circulation pump 21 is stopped). That is, the rotational speed of the circulation pump 14 is increased when the difference (temperature difference) is relatively large although it is less than 10 ° C., and the rotational speed is decreased when the difference is small.

  In this case, since the refrigeration cycle apparatus 2 is stopped, the heat medium cooled by the underground heat collection pipe 12 by the operation of the circulation pump 14 is circulated to the use side heat exchanger 17, and the heat absorption action causes the room to It will be cooled. That is, since the cooling is performed only by underground heat, the power consumption of the refrigeration cycle apparatus 2 becomes zero, and cooling with significantly reduced energy is realized.

  Next, when the heating operation (first operation mode) is started by the command input from the mode change switch described above in autumn or winter, the control device 4 controls the three-way valves 16 and 19, as shown in FIG. Open the respective second outlets 16B, 19B. Then, the compressor 6 and the circulation pumps 14 and 21 are operated. When the compressor 6 of the refrigeration cycle apparatus 2 is operated, the supercritical carbon dioxide refrigerant discharged from the compressor 6 flows into the radiator 7 as described above, where it dissipates heat and reaches the expansion mechanism 8. / The gas is mixed and flows into the evaporator 9. Therefore, the refrigerant evaporates to exhibit an endothermic effect, and repeats circulation that is sucked into the compressor 6.

  On the other hand, when the circulation pump 14 of the geothermal heat collecting device 3 is operated, the geothermal heat collecting pipe 12 absorbs heat from the ground at a temperature of about 15 ° C. (ie, warms in the ground), 10 ° C. The heat medium whose temperature has risen to the extent is sucked from the underground heat collecting pipe 12 and flows into the underground heat exchanger 13 through the pipe 22. Here, heat is radiated to the evaporator 9 of the refrigeration cycle apparatus 2 (the refrigerant in the evaporator 9 absorbs heat and becomes about 5 to 8 ° C.) and is cooled to about 7 ° C., and the circulation pump 14 and the three-way valve 16 is returned to the underground heat collecting pipe 12 and the circulation of absorbing heat is repeated.

  When the circulation pump 21 is operated, the heat medium that has absorbed heat from the refrigerant (about 80 ° C.) flowing through the radiator 7 in the use side heat transfer device 18 and has risen in temperature to about 50 ° C. (the refrigerant is 45 ° C. It cools to a certain extent), enters the use-side heat exchanger 17 through the pipe 23, radiates heat there, reaches about 40 ° C., and then repeats circulation to flow into the use-side heat exchanger 18 again. Since indoor air is circulated by a blower (not shown) in the use-side heat exchanger 17, the indoor air is heated by the heat medium in the use-side heat exchanger 17, thereby heating the room (the air-conditioned space). .

  In this way, in the heating operation, the heat sucked up from the ground by the underground heat collecting pipe 12 is transferred to the underground heat transfer device 13 by the heat medium and transferred to the evaporator 9 of the refrigeration cycle apparatus 2, and this heat Is further conveyed through the refrigerant to the radiator 7 of the refrigeration cycle apparatus 2 and sucked up by the heat medium flowing through the use side heat transfer device 18. Thereby, it becomes possible to realize highly efficient heating operation using geothermal heat with high efficiency.

  In this heating operation as well, the control device 4 controls the compressor 6 and the circulation pumps 14 and 21 based on the outside air temperature or the difference between the room temperature and the room set temperature (temperature difference) as described above. Then, when the difference (temperature difference) is similarly reduced in the autumn season or the like, it is determined that the heating load is small, the refrigeration cycle apparatus 2 is stopped, and the three-way valves 16 and 19 are switched to the state shown in FIG. Therefore, at this time, heating using only underground heat is performed, and an energy saving effect is exhibited particularly in the autumn season in a cold region.

  In the embodiment, in each of the above operating states, the refrigerant flowing through the evaporator 9 of the refrigeration cycle apparatus 2 and the heat medium flowing through the geothermal heat exchanger 13 of the geothermal heat collecting apparatus 3 are counterflows, and the radiator 7 The refrigerant flowing through and the heat medium flowing through the use-side heat transfer device 18 are opposed to each other (the same applies to the following embodiments). Thereby, the refrigerant | coolant temperature difference in the inlet_port | entrance and exit of the evaporator 9 or the heat radiator 7 can be taken large, and it becomes possible to improve refrigerating capacity and operating efficiency further.

  In the above embodiment, the mode changeover switch is used to switch between cooling and heating. However, the present invention is not limited to this, and the auto mode is set, and the cooling operation is automatically performed according to the outside air temperature or the like (geothermal heat collection in the spring season). Cooling only by geothermal heat by the device 3, cooling by the refrigeration cycle device 2 and the geothermal heat sampling device 3 in summer, and heating operation (in the autumn season, heating by geothermal heat only by the geothermal heat sampling device 3, winter season) In this case, heating by the refrigeration cycle apparatus 2 and the geothermal heat collecting apparatus 3 may be performed.

  Next, FIG. 5 and FIG. 6 show another control example by the control device 4 of the geothermal heat pump device 1 of FIG. In the case of this embodiment, as shown in the block diagram of FIG. 5, in addition to the case of FIG. 1, a heat medium outlet temperature sensor 32 for detecting the heat medium outlet temperature of the use side heat exchanger 17 is provided and controlled. Connected to the input of the device 4. In this case, the control device 4 predicts and controls the cooling load based on the difference between the outside air temperature or the room temperature and the room set temperature, and the heat medium inlet / outlet temperature difference.

  That is, when the cooling operation (second operation mode) is started, the control device 4 detects the outside air temperature or the room temperature in step S9 of the flowchart of FIG. 6, and calculates a difference ΔT from the indoor set temperature. In step S10, the rotational speed and discharge temperature of the compressor 6 are set to predetermined initial values based on the difference ΔT, and the operation is started. After a predetermined time, the difference ΔT is calculated again in step S11, and the difference Δt between the heat medium inlet temperature and the heat medium outlet temperature detected by the heat medium outlet temperature sensor 32 is detected in step S12.

  In step S13, ON / OFF of the compressor 6 is set based on the difference ΔT and the difference Δt. That is, when the difference ΔT and the difference Δt are equal to or greater than the respective predetermined threshold values (cooling load is large), the process proceeds to step S14, and when it is less than the threshold value (cooling load is small), the process is set to OFF. Proceed to S18. In step S14, cooling operation (cooling in HP operation) for operating the compressor 6 of the refrigeration cycle apparatus 2 is performed, and in step S15, the rotation speed and discharge temperature of the compressor 6 are set by the difference ΔT and the difference Δt. That is, for example, when the room temperature is higher than the indoor set temperature and heat exchange is actively performed in the use side heat exchanger 17 and the temperature difference between the heat medium inlet and the outlet is large (the difference ΔT and the difference Δt are large), the cooling is performed. Since the load is larger, the rotation speed of the compressor 6 is increased and the set discharge temperature is also increased, thereby increasing the refrigeration capacity of the refrigeration cycle apparatus 2. On the contrary, when the difference ΔT and the difference Δt are equal to or larger than the threshold values but are relatively small, the rotational speed and the set discharge temperature are lowered to reduce the refrigeration capacity of the refrigeration cycle apparatus 2. Further, the control device 4 controls the valve opening degree of the expansion mechanism 8 so that the discharge temperature of the compressor 6 detected by the discharge temperature sensor 28 in step S16 becomes the set discharge temperature.

  Further, in step S17, the control device 4 sets a target heat medium inlet temperature based on the differences ΔT and Δt, and the heat medium inlet temperature of the use side heat exchanger 17 detected by the heat medium inlet temperature sensor 31 is the target heat medium inlet temperature. The rotational speed of the circulation pump 14 is controlled so as to reach a temperature (the circulation pump 21 is stopped). That is, when the temperature of the heat medium flowing into the use side heat exchanger 17 detected by the heat medium inlet temperature sensor 31 (heat medium inlet temperature) is higher than the target heat medium inlet temperature and the difference is large, the circulation pump 14 Reduce the speed.

  On the other hand, if the difference ΔT and the difference Δt are less than the predetermined threshold values in spring, the control device 4 determines that the cooling load is small, sets the compressor 6 to OFF in step S13, and proceeds to step S18. . In this step S18, as shown in FIG. 4, the compressor 6 of the refrigeration cycle apparatus 2 is stopped and the cooling operation (cooling with underground cooling) is performed by cooling only with the underground heat. In step S19, the difference ΔT The rotational speed of the circulation pump 14 is determined and controlled by the difference Δt (circulation pump 21 is stopped). That is, when the difference ΔT and the difference Δt are relatively large, although less than the threshold value, the rotational speed of the circulation pump 14 is increased, and when the difference is small, the rotational speed is decreased.

  As described above, the cooling load is determined by adding the difference ΔT between the outside air temperature or the indoor temperature and the indoor set temperature in Example 1 to the heat medium inlet / outlet temperature difference (Δt) of the use side heat exchanger 17. Thus, the compressor 6, the expansion mechanism 8, and the circulation pump 14 can be controlled by predicting the cooling load more accurately.

  Next, FIG. 7 and FIG. 8 show still another control example by the control device 4 of the geothermal heat pump device 1 of FIG. In the case of this embodiment, as shown in the configuration diagram of FIG. 7, in addition to the case of FIG. 5 (Embodiment 2), a radiator outlet temperature sensor 33 for detecting the outlet temperature of the radiator 7 is provided and controlled. Connected to the input of the device 4. In this case, the control device 4 predicts the cooling load based on the difference between the outside air temperature or the room temperature and the indoor set temperature, and the heat medium inlet / outlet temperature difference, and also considers the outlet temperature of the radiator 7 of the refrigeration cycle apparatus 2. And control.

  That is, when the cooling operation (second operation mode) is started, the control device 4 detects the outside air temperature or the room temperature in step S20 of the flowchart of FIG. 8, and calculates a difference ΔT from the indoor set temperature. In step S21, the rotation speed and discharge temperature of the compressor 6 are set to predetermined initial values based on the difference ΔT, and the operation is started. After a predetermined time, the difference ΔT is calculated again in step S22, and the difference Δt between the heat medium inlet temperature and the heat medium outlet temperature is detected in step S23.

  In step S24, ON / OFF of the compressor 6 is set based on the difference ΔT and the difference Δt. That is, when the difference ΔT and the difference Δt are equal to or larger than the respective predetermined threshold values (cooling load is large), it is set to ON, and the process proceeds to step S25. Proceed to S29. In step S25, the cooling operation (cooling in the HP operation) for operating the compressor 6 of the refrigeration cycle apparatus 2 is performed. In step S26, the rotational speed and discharge temperature of the compressor 6 and the heat radiation are calculated based on the difference ΔT and the difference Δt. Set the outlet temperature. That is, for example, when the room temperature is higher than the indoor set temperature and the heat exchange between the use side heat exchanger 17 and the air is actively performed and the temperature difference between the heat medium inlet and the outlet is large (the difference ΔT and the difference Δt are large). Since the cooling load is larger, the number of revolutions of the compressor 6 is increased and the set discharge temperature is also increased to increase the refrigeration capacity of the refrigeration cycle apparatus 2. In addition, the set radiator outlet temperature is also increased to suppress the decrease in efficiency. On the contrary, when the difference ΔT and the difference Δt are equal to or larger than the threshold values but are relatively small, the rotational speed and the set discharge temperature are lowered to reduce the refrigeration capacity of the refrigeration cycle apparatus 2. The set radiator outlet temperature is also lowered. Further, the control device 4 expands the discharge temperature of the compressor 6 detected by the discharge temperature sensor 28 in step S27, and the expansion mechanism so that the radiator outlet temperature sensor 33 becomes the set discharge temperature and the set radiator outlet temperature. 8 valve opening is controlled.

  Further, the control device 4 sets a target heat medium inlet temperature based on the differences ΔT and Δt in step S28, and the heat medium inlet temperature of the use side heat exchanger 17 detected by the heat medium inlet temperature sensor 31 is the target heat medium inlet temperature. The rotational speed of the circulation pump 14 is controlled so as to reach a temperature (the circulation pump 21 is stopped). That is, when the temperature of the heat medium flowing into the use side heat exchanger 17 detected by the heat medium inlet temperature sensor 31 (heat medium inlet temperature) is higher than the target heat medium inlet temperature and the difference is large, the circulation pump 14 Reduce the speed.

  On the other hand, if the difference ΔT and the difference Δt are less than the predetermined threshold values in spring, the control device 4 determines that the cooling load is small, sets the compressor 6 to OFF in step S24, and proceeds to step S29. . In step S29, as shown in FIG. 4, the compressor 6 of the refrigeration cycle apparatus 2 is stopped and cooling operation (cooling with underground heat) is performed by cooling only with the underground heat. In step S30, the difference ΔT The rotational speed of the circulation pump 14 is determined and controlled by the difference Δt (circulation pump 21 is stopped). That is, when the difference ΔT and the difference Δt are relatively large, although less than the threshold value, the rotational speed of the circulation pump 14 is increased, and when the difference is small, the rotational speed is decreased.

  As described above, in addition to determining the cooling load based on the difference ΔT between the outside air temperature or the indoor temperature and the indoor set temperature in Example 2 and the heat medium inlet / outlet temperature difference (Δt) of the use side heat exchanger 17. The efficiency of the refrigeration cycle apparatus 2 can be improved by controlling the valve opening of the expansion mechanism 8 in consideration of the radiator outlet temperature.

  In addition, FIG. 9 has shown the other structural example of the geothermal heat utilization heat pump apparatus 1 of FIG. 1 (Example 4). In addition, what is shown with the same code | symbol as FIG. 1 shall show | play the same or the same function. In this case, the circulation pump 14 is provided in the pipe 23 between the use side heat exchanger 17 and the use side heat exchanger 18, and the circulation pump 21 is provided in the pipe 22 on the downstream side of the second outlet 16B of the three-way valve 16. ing. The control is the same as in the case of FIG. 1, and the present invention is also effective for such an arrangement of the circulation pump.

  Next, FIG. 10, FIG. 11 has shown the structure of the heat pump apparatus 1 using geothermal heat of the further another Example of this invention. 1 and 2 denote the same or similar functions. In this case, the bypass pipe 24 is not between the piping 23 between the circulation pump 21 and the use side heat exchanger 17 and the first outlet 16A of the three-way valve 16, but the use side heat exchanger (first use side heat). Exchanger) 17 is connected between pipe 23 between user side heat exchanger 18 and first outlet 16A of three-way valve 16, and second bypass side heat exchanger 34 is connected to this bypass pipe 24. Is provided. Therefore, the use side heat exchanger 17 is a first use side heat exchanger. And the 2nd utilization side heat exchanger 34 is provided in the air inflow side of the 1st utilization side heat exchanger 17, for example.

  Thus, the heating operation (first operation mode) is the same as in FIG. 2, but when the circulation pump 14 of the geothermal heat collection device 3 is operated during the cooling operation (second operation mode), The heat medium radiated into the ground at a temperature of about 15 ° C. (for example, cooled in the ground) by the medium heat collecting pipe 12, and the heat medium whose temperature has dropped to about 20 ° C. is sucked from the ground heat collecting pipe 12 and is piped 22 and flows into the underground heat transfer device 13 where heat is radiated to the evaporator 9 of the refrigeration cycle apparatus 2 (the evaporator 9 absorbs heat) and further cooled to about 7 ° C., and the circulation pump 14 and It passes through the bypass pipe 24 via the three-way valve 16 and flows into the second use side heat exchanger 34.

  As described above, the indoor air is also circulated by the blower (not shown) in the second usage-side heat exchanger 34, so that the heat medium flowing into the second usage-side heat exchanger 34 absorbs heat from the indoor air and is about 12 ° C. The temperature rises. On the other hand, since the indoor air is cooled by the heat medium, the room (the air-conditioned space) is cooled. The heat medium exiting from the use side heat exchanger 17 then enters the use side heat exchanger 18. Since the refrigerant of about 70 ° C. flows into the radiator 7 of the refrigeration cycle apparatus 2, the heat medium passing through the use side heat transfer device 18 absorbs heat, and the refrigerant passing through the radiator 7 is cooled. Then, the refrigerant is cooled to about 15 ° C., flows out of the radiator 7, and goes to the expansion mechanism 8. The temperature of the heat medium rises to about 40 ° C., passes through the three-way valve 19 and the bypass pipe 26, and returns to the underground heat collection pipe 12. In the underground heat collecting pipe 12, the heat medium again radiates heat into the ground (about 15 ° C.), and repeats circulation toward the underground heat exchanger 13.

  That is, in the case of the fifth embodiment, cooling is performed separately by the second usage-side heat exchanger 34 and heating is performed separately by the first usage-side heat exchanger 17. Therefore, in the cooling operation state of FIG. 10, for example, the control device 4 opens the second outlet 19B of the three-way valve 19 slightly (duty control for selectively opening the first outlet 19A and the second outlet 19B, Alternatively, the opening degree of the first outlet 19A is kept as it is, and the second outlet 19B is also slightly opened), and a part of the heat medium exiting the use side heat exchanger 18 is diverted by the three-way valve 19, After flowing through the use side heat exchanger 17, the second use side heat exchanger 34 may be joined to the heat medium that has exited.

  As described above, the temperature of the heat medium that has exited the use side heat exchanger 18 has increased to about 40 ° C. Therefore, by performing such control, the room air is passed through the second use side heat exchanger 34. After being cooled, the first use side heat exchanger 17 is heated. That is, after the moisture in the air is removed by the second use side heat exchanger 34, the temperature can be increased by the first use side heat exchanger 17 and then blown out into the room. Realized (third operation mode). This dehumidifying operation is also performed by command input to the control device 4 by a mode changeover switch (not shown).

  Next, FIG. 12, FIG. 13 has shown the structure of the geothermal heat utilization heat pump apparatus 1 of the further another Example of this invention. 1 and 2 denote the same or similar functions. In this case, the refrigeration cycle apparatus 2 includes another radiator (third radiator) 36 in the refrigerant circuit 10 between the refrigeration cycle 7 and the expansion mechanism 8 on the downstream side of the radiator 7. In addition, another second refrigerant circuit 37 that is on the higher side with respect to the refrigerant circuit 10 is provided. Therefore, the refrigerant circuit 10 is the first refrigerant circuit in this case. The second refrigerant circuit 37 is configured by sequentially connecting a second compressor 38, a second radiator 39, a second expansion mechanism 41, and a second evaporator 42 in an annular manner. Therefore, in this case, the compressor 6 is a first compressor, the radiator 7 is a first radiator, the expansion mechanism 8 is a first expansion mechanism, and the evaporator 9 is a first evaporator. Then, the radiator 36 of the first refrigerant circuit 10 and the second evaporator 42 of the second refrigerant circuit 37 are cascade-connected, so that both the refrigerant circuits 10 and 37 have two second refrigerant circuits 37. The high-reduction side of the original connection and the first refrigerant circuit 10 constitute a binary refrigerating apparatus that becomes the low-source side of the binary connection.

  A three-way valve 43 is provided in the outlet side pipe 23 of the use side heat exchanger 17, and a first outlet 43 </ b> A of the three-way valve 43 is connected to the use side heat exchanger 18 through the pipe 23. Further, the second outlet 43B of the three-way valve 43 is connected to an inlet of a second use side heat exchanger 46 provided in a heat exchange relationship with the second radiator 39 via a pipe 44. Therefore, in this case, the use side heat transfer device 18 becomes the first use side heat transfer device. A three-way valve 47 is connected to the outlet of the second usage side heat transfer unit 46, and a first outlet 47A of the three-way valve 47 is connected to a hot water supply heat exchanger 49 via a pipe 48, and this hot water supply heat is supplied. The outlet of the exchanger 49 is also connected to the inlet of the circulation pump 51 by a pipe 48, and the outlet of the circulation pump 51 is connected to the inlet of the second usage side heat exchanger 46 by a pipe 48. The second outlet 47B of the three-way valve 47 is connected to the inlet of the three-way valve 19 by a pipe 52. The hot water supply heat exchanger 49 heats water in a hot water storage tank (not shown). And since the same heat medium is enclosed also in this piping 52, the heat medium circulation apparatus 27 in this case is the circulation pumps 14, 21, 51, the three-way valves 16, 19, 43, 47, the piping 22, 23. , 44, 48, 52 and bypass pipes 24, 26. Also in this case, the same control device 4 as described above is provided to control the refrigeration cycle device 2 and the heat medium circulation device 27.

  Next, the operation of the heat pump apparatus 1 using geothermal heat according to this embodiment will be described. First, the cooling operation (second operation mode) will be described. Similarly, when the cooling operation (second operation mode) is started by a command input from a mode changeover switch (not shown) from the spring season to the summer season, the control device 4 causes the three-way valves 16, 19, 43, 47 to be opened as shown in FIG. Control and open the respective first outlets 16A, 19A, 43A, 47A. Then, the first compressor 6 and the second compressor 38 are operated, and the circulation pumps 14 and 51 are operated (the circulation pump 21 is stopped).

  When the second compressor 38 of the refrigeration cycle apparatus 2 is operated, the high-temperature and high-pressure refrigerant discharged from the second compressor 38 flows into the second radiator 39, where it dissipates heat and the second expansion. The mechanism 41 is reached, and the pressure is reduced and flows into the second evaporator 42. Therefore, the refrigerant evaporates and exhibits an endothermic effect, and repeats circulation that is sucked into the second compressor 38.

  On the other hand, when the first compressor 6 is operated, the supercritical carbon dioxide refrigerant discharged from the first compressor 6 sequentially flows into the first radiator 7 and further to the radiator 36 at the next stage. Then, they dissipate heat to reach the first expansion mechanism 8, enter a liquid / gas mixed state, and flow into the first evaporator 9. Therefore, the refrigerant evaporates and exhibits an endothermic effect, and repeats circulation that is sucked into the first compressor 6. At this time, since the radiator 36 of the refrigerant circuit 10 and the second evaporator 42 of the refrigerant circuit 37 are cascade-connected, the carbon dioxide refrigerant flowing into the first expansion mechanism 8 is supercooled. The first and second high pressures of the first refrigerant circuit 10 and the second refrigerant circuit 37 are substantially equal at the supercritical pressure, as shown in the ph diagram of FIG. Are controlled by the expansion mechanisms 8 and 41. Therefore, it becomes a heat medium of the same temperature range, and the total efficiency of the 1st and 2nd refrigerant circuits 10 and 37 can be improved. By setting the second refrigerant circuit 37 to a predetermined refrigerant filling amount, the low pressure becomes the optimum pressure and the efficiency is improved.

  On the other hand, when the circulation pump 14 of the geothermal heat collecting device 3 is operated, the geothermal heat collecting pipe 12 radiates heat to the ground at a temperature of, for example, about 15 ° C. (that is, is cooled in the ground), and 20 ° C. The heat medium whose temperature has decreased to the extent is sucked from the underground heat collecting pipe 12 and flows into the underground heat exchanger 13 through the pipe 22. Here, the first evaporator 9 of the refrigerant circuit 10 dissipates heat (the evaporator 9 absorbs heat) and is further cooled to about 7 ° C., passes through the bypass pump 24 and the three-way valve 16, passes through the bypass pipe 24, and is used. It flows into the heat exchanger 17.

  Since indoor air is circulated by a blower (not shown) in the usage-side heat exchanger 17, the heat medium flowing into the usage-side heat exchanger 17 absorbs heat from the indoor air and rises to about 12 ° C. On the other hand, since the indoor air is cooled by the heat medium, the room (the air-conditioned space) is cooled. The heat medium exiting from the use side heat exchanger 17 then enters the first use side heat exchanger 18 via the three-way valve 43. Since the refrigerant of about 70 ° C. flows into the first radiator 7 of the refrigerant circuit 10, the heat medium passing through the first use side heat transfer device 18 absorbs heat and passes through the first radiator 7. Is cooled. Then, the refrigerant is cooled to about 15 ° C., flows out of the first radiator 7, and travels to the first expansion mechanism 8. The temperature of the heat medium rises to about 40 ° C., passes through the three-way valve 19 and the bypass pipe 26, and returns to the underground heat collection pipe 12. In the geothermal heat collecting pipe 12, the heat medium again radiates heat into the ground (about 15 ° C.) and repeats circulation toward the underground heat exchanger 13.

  Also in this case, the heat medium radiated into the ground by the geothermal heat collecting pipe 12 of the geothermal heat collecting apparatus 3 flows into the underground heat transfer device 13 and the first evaporator 9 of the refrigerant circuit 10. After heat exchange and further cooling by the evaporator 9, the heat flows into the use side heat exchanger 17, so that the cooling performance by the use side heat exchanger 17 can be improved. And after the heat medium which exited the use side heat exchanger 17 flows into the 1st use side heat exchanger 18, it heat-exchanges with the 1st radiator 7 of the refrigerant circuit 10, and after temperature rises, Since it returns to the underground heat collecting pipe 12 again, the heat exchange efficiency in the ground is also improved.

  On the other hand, the refrigerant in the refrigerant circuit 10 radiates heat to the heat medium flowing through the first usage-side heat exchanger 18 by the first radiator 7 and radiates heat to the second evaporator 42 by the radiator 36. Then, the circulation of the refrigerant circuit 10 is repeated because it is squeezed by the first expansion mechanism 8 and repeatedly circulates by absorbing heat from the heat medium flowing into the first evaporator 9 and flowing through the underground heat exchanger 9. It becomes good.

  When the circulation pump 51 is operated, the heat medium heated by the second radiator 39 in the refrigerant circuit 37 in the second usage-side heat exchanger 46 flows into the hot water supply heat exchanger 49. Then, after the heat is radiated, the circulation to return to the second use side heat exchanger 46 is repeated, so that the hot water supply heat exchanger 49 can heat the water in the hot water storage tank and supply hot water. Become. As a result, the geothermal heat pump device 1 can achieve highly efficient cooling operation with high efficiency while supplying hot water. In this case as well, the heat medium flowing through the hot water supply heat exchanger 49 and the refrigerant flowing through the second heat radiator 39 are similarly opposed.

  Next, when the heating operation (first operation mode) is started by the command input from the mode change switch described above in autumn or winter, the control device 4 controls the three-way valves 16 and 19, as shown in FIG. Open the respective second outlets 16B, 19B. For the three-way valve 43 and the three-way valve 47, both the first and second outlets 43A and 43B and 47A and 47B are opened. Then, the first compressor 6, the second compressor 38, and the circulation pumps 14, 21, 51 are operated. The operations of the first refrigerant circuit 10 and the second refrigerant circuit 37 are the same as described above.

  On the other hand, when the circulation pump 14 of the geothermal heat collecting device 3 is operated, the geothermal heat collecting pipe 12 absorbs heat from the ground at a temperature of about 15 ° C. (ie, warms in the ground), 10 ° C. The heat medium whose temperature has risen to the extent is sucked from the underground heat collecting pipe 12 and flows into the underground heat exchanger 13 through the pipe 22. Here, heat is radiated to the first evaporator 9 of the refrigerant circuit 10 (the refrigerant in the evaporator 9 absorbs heat and becomes about 5 to 8 ° C.) and is cooled to about 7 ° C., and the circulation pump 14 and It returns to the underground heat collecting pipe 12 through the three-way valve 16 and repeats the cycle of absorbing heat again.

  Further, when the circulation pump 21 is operated, the refrigerant that flows in the first radiator 7 and the second radiator 39 in the first usage-side heat transfer device 18 and the second usage-side heat transfer device 46 is used. The heat medium that has absorbed heat and has risen in temperature passes through the pipe 23, the three-way valve 47, and the pipe 52, enters the use-side heat exchanger 17, and then radiates heat. 18, The circulation which flows into the 2nd utilization side heat exchanger 46 is repeated. Since indoor air is circulated by a blower (not shown) in the use-side heat exchanger 17, the indoor air is heated by the heat medium in the use-side heat exchanger 17, thereby heating the room (the air-conditioned space). .

  When the circulation pump 51 is operated, the heat medium heated by the heat radiation from the second radiator 39 of the refrigerant circuit 37 in the second use side heat transfer device 46 passes through the three-way valve 47 to exchange heat for hot water supply. Since the heat is radiated there and then circulated back to the second user-side heat exchanger 46 again, the water in the hot water storage tank 49 is heated in the hot water supply heat exchanger 49, and the hot water is supplied. Can be done. As a result, the heat pump device 1 using the underground heat in this case can realize a highly efficient heating operation with high efficiency while supplying hot water.

  Next, FIG. 14, FIG. 15 has shown the structure of the heat pump 1 using a geothermal heat of the further another Example of this invention. In addition, what is shown with the same code | symbol as FIG. 12, FIG. 13 shall show | play the same or similar function. Also in this case, the refrigeration cycle apparatus 2 includes another radiator (third radiator) 36 in the refrigerant circuit 10 between the refrigeration cycle 7 and the expansion mechanism 8 on the downstream side of the radiator 7. Further, a second refrigerant circuit 37 is provided as another high-side for the refrigerant circuit 10. Therefore, the refrigerant circuit 10 is the first refrigerant circuit in this case. The second refrigerant circuit 37 is configured by sequentially connecting a second compressor 38, a second radiator 39, a second expansion mechanism 41, and a second evaporator 42 in an annular manner. Therefore, in this case, the compressor 6 is a first compressor, the radiator 7 is a first radiator, the expansion mechanism 8 is a first expansion mechanism, and the evaporator 9 is a first evaporator. Then, the radiator 36 of the first refrigerant circuit 10 and the second evaporator 42 of the second refrigerant circuit 37 are cascade-connected, so that both the refrigerant circuits 10 and 37 have two second refrigerant circuits 37. The high-reduction side of the original connection and the first refrigerant circuit 10 constitute a binary refrigerating apparatus that becomes the low-source side of the binary connection.

  The bypass pipe 24 connects the first outlet 16 </ b> A of the three-way valve 16 and the inlet pipe of the second usage side heat exchanger 46, and the second usage side heat exchanger 53 is provided in the bypass 24. It has been. Similarly, the second use side heat transfer device 46 is provided in a heat exchange relationship with the second heat radiator 39 of the second refrigerant circuit 37. In addition, the outlet of the second use side heat exchanger 46 is connected to the inlet of the three-way valve 19 by a pipe 61, and the first outlet 19 </ b> A of the three-way valve 19 is connected to the inlet of the underground heat collection pipe 12 by the bypass pipe 26. It is connected.

  Similarly, the first user-side heat exchanger 18 is provided in a heat exchange relationship with the first radiator 7 of the refrigerant circuit 10, and the inlet of the first user-side heat exchanger 18 is connected to the pipe 62. To the first outlet 54A of the three-way valve 54. The second outlet 54 </ b> B of the three-way valve 54 is connected to the inlet of the second usage side heat transfer unit 46 through the pipe 63. The second outlet 19 </ b> B of the three-way valve 19 is connected to the inlet of the circulation pump 56 by a pipe 64, and the outlet of the first usage-side heat exchanger 18 is connected to the pipe 64 by a pipe 66.

  The outlet of the circulation pump 56 is connected to the inlet of the three-way valve 57 by a pipe 67, and the first outlet 57 </ b> A of the three-way valve 57 is connected to the inlet of the third usage side heat exchanger 68. Further, the second outlet 57 </ b> B of the three-way valve 57 is connected to the inlet of the first use side heat exchanger 58. The outlets of these use side heat exchangers 68 and 58 are joined together and connected to the inlet of the three-way valve 54 via a pipe 69.

  In this case, the heat medium circulation device 27 includes the circulation pumps 14 and 56, the three-way valves 16, 19, 54, and 57, the piping 22, 61, 62, 63, 64, 66, 67, and 69, and the bypass tubes 24 and 26. Etc. Also in this case, the same control device 4 as described above is provided to control the refrigeration cycle device 2 and the heat medium circulation device 27. The third use side heat exchanger 68 is provided in a heat exchange relationship with the hot water supply heat exchanger 71, and the hot water supply heat exchanger 71 is supplied with water in the hot water storage tank 73 through a circulation circuit 74 by a circulation pump 72. Is circulated.

  Next, the operation of the heat pump apparatus 1 using geothermal heat according to this embodiment will be described. First, the cooling operation (second operation mode) will be described. Similarly, when the cooling operation (second operation mode) is started by a command input from a mode changeover switch (not shown) from the spring season to the summer season, the control device 4 opens the three-way valves 16, 19, 54, 57 as shown in FIG. Control and open the respective first outlets 16A, 19A, 54A, 57A. Then, the first compressor 6 and the second compressor 38 are operated, and the circulation pumps 14, 56, 72 are operated. The operations of the first and second refrigerant circuits 10 and 37 are the same as described above.

  When the circulation pump 14 of the geothermal heat collecting apparatus 3 is operated, the geothermal heat collecting pipe 12 radiates heat to the ground at a temperature of, for example, about 15 ° C. (that is, is cooled in the ground), and reaches about 20 ° C. The heat medium having a lowered temperature is sucked from the underground heat collecting pipe 12 and flows into the underground heat exchanger 13 through the pipe 22. Here, heat is dissipated to the first evaporator 9 of the refrigerant circuit 10 (the evaporator 9 absorbs heat) and further cooled to about 7 ° C., passes through the bypass pump 24 and the three-way valve 16, passes through the bypass pipe 24, To the use side heat exchanger 53.

  Since the indoor air is also circulated by the blower (not shown) in the second usage-side heat exchanger 53, the heat medium flowing into the second usage-side heat exchanger 53 absorbs heat from the indoor air and has a temperature of about 12 ° C. To rise. On the other hand, since the indoor air is cooled by the heat medium, the room (the air-conditioned space) is cooled. The heat medium that has exited from the second usage side heat exchanger 53 then enters the second usage side heat exchanger 46. Since the high-temperature refrigerant flows into the second radiator 39 of the refrigerant circuit 37, the heat medium passing through the second usage-side heat exchanger 46 absorbs heat, and the refrigerant passing through the second radiator 39 is cooled. Is done. In this case as well, the heat medium flowing through the second usage-side heat exchanger 46 and the refrigerant flowing through the second radiator 39 are opposed to each other. Then, the refrigerant flows out from the second radiator 39 and moves toward the second expansion mechanism 41. The temperature of the heat medium rises to about 40 ° C., passes through the three-way valve 19 and the bypass pipe 26, and returns to the underground heat collection pipe 12. In the geothermal heat collecting pipe 12, the heat medium again radiates heat into the ground (about 15 ° C.) and repeats circulation toward the underground heat exchanger 13.

  Also in this case, the heat medium radiated into the ground by the geothermal heat collecting pipe 12 of the geothermal heat collecting apparatus 3 flows into the underground heat transfer device 13 and the first evaporator 9 of the refrigerant circuit 10. After heat exchange and further cooling by the evaporator 9, the refrigerant flows into the second usage-side heat exchanger 53, so that the cooling performance by the second usage-side heat exchanger 53 can be improved. . Then, the heat medium exiting the second use side heat exchanger 53 flows into the second use side heat exchanger 46 and exchanges heat with the second radiator 39 of the refrigerant circuit 37 to increase the temperature. After that, since it returns to the underground heat collecting pipe 12, the heat exchange efficiency in the ground is also improved.

  On the other hand, the refrigerant in the refrigerant circuit 37 radiates heat to the heat medium flowing through the second usage-side heat exchanger 46 by the second radiator 39, and is then throttled by the second expansion mechanism 41, Since the circulation of absorbing heat from the refrigerant flowing into the evaporator 42 and flowing through the radiator 36 is repeated, the operation efficiency of the refrigerant circuits 37 and 10 is also improved.

  When the circulation pump 56 is operated, the heat medium heated by the heat radiation from the first radiator 7 of the refrigerant circuit 10 by the first usage-side heat transfer device 18 is the piping 66, the circulation pump 56, the piping. 67, flows into the third usage side heat exchanger 68 through the three-way valve 57, radiates heat, and then returns to the first usage side heat exchanger 18 through the pipe 69, the three-way valve 54, and the pipe 62. Since it repeats, it becomes possible to heat the water in the hot water storage tank 73 circulated by the heat exchanger 71 for hot water supply, and to perform hot water supply here. As a result, the geothermal heat pump device 1 can achieve highly efficient cooling operation with high efficiency while supplying hot water.

  Next, when the heating operation (first operation mode) is started by the command input from the mode change switch described above in autumn or winter, the control device 4 controls the three-way valves 16 and 19, as shown in FIG. Open the respective second outlets 16B, 19B. For the three-way valve 54 and the three-way valve 57, both the first and second outlets 54A and 54B and 57A and 57B are opened. Then, the first compressor 6, the second compressor 38, and the circulation pumps 14, 56, 72 are operated. The operations of the first refrigerant circuit 10 and the second refrigerant circuit 37 are the same as described above.

  On the other hand, when the circulation pump 14 of the geothermal heat collecting device 3 is operated, the geothermal heat collecting pipe 12 absorbs heat from the ground at a temperature of about 15 ° C. (ie, warms in the ground), 10 ° C. The heat medium whose temperature has risen to the extent is sucked from the underground heat collecting pipe 12 and flows into the underground heat exchanger 13 through the pipe 22. Here, heat is radiated to the first evaporator 9 of the first refrigerant circuit 10 (the refrigerant in the evaporator 9 absorbs heat and becomes about 5 to 8 ° C.) and is cooled to about 7 ° C. It returns to the underground heat collecting pipe 12 through the pump 14 and the three-way valve 16 and repeats the cycle of absorbing heat again.

  In addition, when the circulation pump 56 is operated, the refrigerant that flows in the first radiator 7 and the second radiator 39 in the first user-side heat transfer device 18 and the second user-side heat transfer device 46 is used. The heat medium that has absorbed the temperature and has risen in temperature passes through the pipes 66, 61, 64, the three-way valve 19, the circulation pump 56, the pipe 67, and the three-way valve 57, and then the first use side heat exchanger 58 or the third use side heat. After entering the exchanger 68 and radiating heat with them, the circulation which flows into the 1st utilization side heat exchanger 18 and the 2nd utilization side heat exchanger 46 again through the three-way valve 54 and the piping 62 and 63 is repeated. Since the indoor air is also circulated by the blower (not shown) in the first usage-side heat exchanger 58, the indoor air is heated by the heat medium in the first usage-side heat exchanger 58. The space is heated.

  Moreover, since the water in the hot water storage tank 73 circulated to the hot water supply heat exchanger 71 can also be heated and hot water can be supplied, the geothermal heat pump device 1 can perform extremely hot performance while supplying hot water. It is possible to realize a good heating operation with high efficiency.

  In each of the above-described embodiments, the refrigeration cycle device 2 and the geothermal heat collecting device 3 are controlled by the outside air temperature, the room temperature, and the room set temperature, but not limited thereto, based on the outside air temperature humidity or the room humidity, or The cooling load may be determined by considering them in addition to the temperature, and may be controlled by the control device 4.

  In addition, the operating state in which the refrigeration cycle apparatus 2 is stopped is effective in all the above embodiments. In the case of FIGS. 11 and 15, the use side heat exchangers 17 and 58 may be heat exchangers for floor heating or the like. Good. Furthermore, in the case of FIG. 12 to FIG. 5, the refrigeration cycle apparatus 2 is configured by a so-called binary refrigeration apparatus including the first refrigerant circuit 10 and the second refrigerant circuit 37. It is also effective to divide the downstream side of the radiator 7 and incorporate the second compressor 38 on one side and join the outlet of the second radiator 39 at the inlet of the expansion mechanism 8. In that case, the second compressor 38 and the second radiator 39 are on the rear stage side of the first compressor 6 and the first radiator 7, and both constitute a so-called two-stage refrigeration apparatus. Become.

  Further, in each of the above embodiments, the geothermal heat pump device 1 that can perform the heating operation has been described. However, the invention is not limited thereto, and the invention of claim 1 is effective even in an apparatus that can perform only the cooling operation. is there.

DESCRIPTION OF SYMBOLS 1 Heat pump apparatus using geothermal heat 2 Refrigerating cycle apparatus 3 Geothermal heat collecting apparatus 4 Control apparatus 6, 38 Compressor 7, 36, 39 Radiator 8, 41 Expansion mechanism 9, 42 Evaporator 10, 37 Refrigerant circuit 12 Ground Medium heat collection pipe 13 Geothermal heat exchanger 14, 21, 51, 56, 72 Circulation pump 16, 19, 43, 47, 54, 57 Three-way valve 17, 34, 53, 58, 68 Usage side heat exchanger 18 , 46 Utilization side heat transfer device 24, 26 Bypass pipe 27 Heat medium circulation device

Claims (10)

A refrigeration cycle apparatus having a compressor, a radiator, an expansion mechanism, and a refrigerant circuit including an evaporator;
A underground heat collecting pipe buried in the ground,
An underground heat exchanger provided in a heat exchange relationship with the evaporator;
A user-side heat exchanger for air conditioning;
A use side heat exchanger provided in a heat exchange relationship with the radiator;
These underground heat collection tubes, underground heat exchangers, use side heat exchangers, and heat medium circulation devices that control the flow of the heat medium to the use side heat exchangers ,
A control device for controlling the refrigeration cycle device and the heat medium circulation device;
The control device causes the heat medium circulation device to circulate the heat medium in the order of the underground heat collection pipe, the underground heat transfer device, the use side heat exchanger, and the use side heat transfer device. A heat pump device using underground heat. A refrigeration cycle apparatus having a compressor, a radiator, an expansion mechanism, and a refrigerant circuit including an evaporator;
A underground heat collecting pipe buried in the ground,
An underground heat exchanger provided in a heat exchange relationship with the evaporator;
A user-side heat exchanger for air conditioning;
A use side heat exchanger provided in a heat exchange relationship with the radiator;
These underground heat collection tubes, underground heat exchangers, use side heat exchangers, and heat medium circulation devices that control the flow of the heat medium to the use side heat exchangers,
A control device for controlling the refrigeration cycle device and the heat medium circulation device;
The control device circulates the heat medium between the underground heat collection pipe and the underground heat transfer device by the heat medium circulation device, and also uses the use side heat exchanger and the use side heat transfer. A first operation mode in which the heat medium is circulated with a container;
A second operation in which the heat medium is circulated in the order of the underground heat collection pipe, the underground heat exchanger, the use side heat exchanger, and the use side heat exchanger by the heat medium circulation device. A heat pump device using geothermal heat, characterized by having a mode. A refrigeration cycle apparatus having a compressor, a radiator, an expansion mechanism, and a refrigerant circuit including an evaporator;
A underground heat collecting pipe buried in the ground,
An underground heat exchanger provided in a heat exchange relationship with the evaporator;
First and second use side heat exchangers for air conditioning;
A use side heat exchanger provided in a heat exchange relationship with the radiator;
These underground heat collection tubes, underground heat exchangers, both use side heat exchangers, and a heat medium circulation device that controls the flow of the heat medium to the use side heat exchangers,
A control device for controlling the refrigeration cycle device and the heat medium circulation device;
The control device circulates the heat medium between the underground heat collection pipe and the underground heat exchanger by the heat medium circulation device, and also uses the first use-side heat exchanger and the use. A first operation mode in which the heat medium is circulated with a side heat exchanger;
The heat medium circulating device circulates the heat medium in the order of the underground heat collection pipe, the underground heat exchanger, the second usage side heat exchanger, and the usage side heat exchanger. A heat pump device using geothermal heat, characterized by having two operation modes.   The controller uses the heat medium circulation device to divert a part of the heat medium that has exited the use side heat transfer device, and to flow to the first use side heat exchanger. The geothermal heat utilization heat pump device according to claim 3, further comprising a third operation mode in which the heat medium exiting the side heat exchanger is joined. The first compressor and the first radiator, the expansion mechanism, the evaporator, the high-side side of the binary connection to the first compressor and the first radiator, or the two-stage connection A refrigeration cycle apparatus having a refrigerant circuit including a second compressor and a second radiator provided in a relation on the rear stage side;
A underground heat collecting pipe buried in the ground,
An underground heat exchanger provided in a heat exchange relationship with the evaporator;
A user-side heat exchanger for air conditioning;
A first user-side heat exchanger provided in a heat exchange relationship with the first radiator;
A second user-side heat exchanger provided in a heat exchange relationship with the second radiator;
A heat medium that controls the flow of the heat medium to these underground heat collection tubes, underground heat exchangers, use-side heat exchangers, first use-side heat transfer units, and second use-side heat transfer units A circulation device;
A control device for controlling the refrigeration cycle device and the heat medium circulation device;
The control device circulates the heat medium between the geothermal heat collection pipe and the geothermal heat exchanger by the heat medium circulation device, and the use side heat exchanger and the first and first A first operation mode in which the heat medium is circulated between the two use side heat exchangers;
The heat medium circulating device circulates the heat medium in the order of the underground heat collecting pipe, the underground heat exchanger, the use side heat exchanger, and the first use side heat exchanger. A heat pump device using geothermal heat, characterized by having two operation modes. The first compressor and the first radiator, the expansion mechanism, the evaporator, the high-side side of the binary connection to the first compressor and the first radiator, or the two-stage connection A refrigeration cycle apparatus having a refrigerant circuit including a second compressor and a second radiator provided in a relation on the rear stage side;
A underground heat collecting pipe buried in the ground,
An underground heat exchanger provided in a heat exchange relationship with the evaporator;
First and second use side heat exchangers for air conditioning;
A third user-side heat exchanger for supplying hot water;
A first user-side heat exchanger provided in a heat exchange relationship with the first radiator;
A second user-side heat exchanger provided in a heat exchange relationship with the second radiator;
Heat that controls the flow of the heat medium to these underground heat collection tubes, underground heat exchangers, each use-side heat exchanger, first use-side heat transfer, and second use-side heat transfer A medium circulation device;
A control device for controlling the refrigeration cycle device and the heat medium circulation device;
The control device circulates the heat medium between the underground heat collection pipe and the underground heat exchanger by the heat medium circulation device, and also includes the first use side heat exchanger and the third heat exchanger. A first operation mode for circulating the heat medium between the use side heat exchanger and the first and second use side heat exchangers;
The heat medium is circulated in the order of the underground heat collection pipe, the underground heat exchanger, the second usage side heat exchanger, and the second usage side heat exchanger by the heating medium circulation device. And a geothermal heat utilization heat pump characterized by having a second operation mode for circulating the heat medium between the third utilization side heat exchanger and the first utilization side heat exchanger. apparatus. The refrigerant flowing through the evaporator and the heat medium flowing through the underground heat exchanger are opposed to each other, and the refrigerant flowing through the radiator and the heat medium flowing through the user-side heat exchanger , or the first heat dissipation. The refrigerant flowing through the heater and the heat medium flowing through the first user-side heat transfer device, or the refrigerant flowing through the second heat radiator and the heat medium flowing through the second user-side heat transfer device are opposed to each other. The heat pump apparatus using geothermal heat according to any one of claims 1 to 6. The control device is a cooling load and temperature of the air-conditioned space in a state where the heat medium is circulated in the order of the underground heat collection pipe, the underground heat exchanger, the use side heat exchanger, and the use side heat exchanger. , humidity, outside air temperature, one of the humidity, or combinations thereof, or, wherein in the second operating mode cooling load of the air-conditioned space, temperature, humidity, outside air temperature, one of the humidity The operation of the said refrigerating-cycle apparatus is controlled based on one or those combinations, The geothermal heat pump apparatus in any one of the Claims 1 thru | or 7 characterized by the above-mentioned. The control device, the underground heat Tonetsu tube, underground heat heat transfer device, the usage-side heat exchanger, and, in a state in which the heat medium is circulated in the order of the usage-side heat transfer unit, or the second operating The geothermal heat pump device according to any one of claims 1 to 8 , wherein in the mode, the refrigeration cycle device is controlled to stop. The ground heat utilization heat pump device according to any one of claims 1 to 9, wherein carbon dioxide is enclosed as a refrigerant in a refrigerant circuit of the refrigeration cycle apparatus.

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