JPH05288428A - Air conditioner - Google Patents

Abstract

(57) [Summary] [Object] To provide an air conditioner refrigeration cycle capable of performing heating operation, cooling operation, and dehumidifying operation, and improving comfort and energy saving in each operation. [Structure] A cycle in which a refrigerant circulates through an intermediate heat exchanger 5 and a cycle in which a second medium circulates are combined, and a bypass pipe 9 provided with a flow rate control valve 10 bypasses the first utilization side heat exchanger 3. And a cycle configuration
In each of heating, cooling, and dehumidifying operations, the first and second utilization side heat exchangers are controlled to different temperature levels suitable for each air-conditioning system and air-conditioning system. [Effect] The air-conditioning system and the air-conditioning system having different temperature levels of the radiation system can be used individually or in combination, and the comfort can be improved and the energy can be saved.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air conditioner to which a heat pump cycle is applied, and in particular, a heat pump provided with a plurality of heat exchangers on the use side that can be controlled at different temperature levels in order to improve comfort and save energy. The present invention relates to an air conditioner to which a cycle is applied.

[0002]

2. Description of the Related Art Recent air conditioners using a refrigerating cycle are mainly heat pumps that can be used as air conditioners for heating and cooling operations and can be used as air conditioners throughout the year. A cycle configuration has been proposed in which a plurality of exchangers are provided and floor heating is enabled during heating operation.

For example, as shown in FIG. 8, the structure disclosed in Japanese Patent Laid-Open No. 62-276371 has a compressor, a four-way valve,
The outdoor heat exchanger, the decompression device, and the indoor heat exchanger are sequentially connected by a refrigerant pipe, and a radiation panel is provided between the four-way valve and the indoor heat exchanger. In this cycle configuration, during heating operation, high temperature refrigerant discharged from the compressor is made to flow from the radiant panel to the indoor heat exchanger, and both indoor heat exchanger and radiant panel are used to improve comfort during heating. There is.

[0004]

By the way, the comfort of the air conditioner needs to be comprehensively considered during each operation of heating, cooling and dehumidifying, and at the same time, it must be satisfied in a form compatible with energy saving. The conventional refrigeration cycle provided with the two use-side heat exchangers having different temperatures has the following problems.

The refrigeration cycle shown in FIG. 8 has a cycle configuration for performing heating operation and cooling operation, but the radiant panel provided between the four-way valve and the indoor heat exchanger has a high temperature gas region during heating operation. It is set to a higher temperature than the indoor heat exchanger that uses the condensation area. Further, during the cooling operation, the low-temperature refrigerant flows through the radiation panel, but is not effectively used. Therefore, it has not been sufficiently considered in terms of energy saving.

The object of the present invention is to solve the above-mentioned problems of the prior art and to combine a plurality of air-conditioning systems having different temperature levels with a relatively simple cycle structure to provide a comfortable operation mainly in heating operation and dehumidifying operation. It is an object of the present invention to provide a heat pump cycle that can improve the efficiency or save energy.

[0007]

In order to achieve the above object, the air conditioner of the present invention is an air conditioner having a first use side heat exchanger and a second use side heat exchanger in a room.
The compressor, the first use side heat exchanger, the first expansion device, the intermediate heat exchanger for exchanging heat between the refrigerant and the second medium, the second expansion device, the heat source side heat exchanger are sequentially connected to circulate the refrigerant. And connecting a pipe provided with a flow rate control valve so as to bypass the first use side heat exchanger, and connecting the second use side heat exchanger via the intermediate heat exchanger. It is arranged such that the second medium is circulated in the second utilization side heat exchanger.

Further, in an air conditioner having a first utilization side heat exchanger and a second utilization side heat exchanger in a room, a compressor, a first utilization side heat exchanger, a first expansion device, a refrigerant and a second medium. The intermediate heat exchanger for exchanging heat, the second expansion device, and the heat source side heat exchanger are sequentially connected to constitute a cycle for circulating the refrigerant, and the reservoir provided with two-way valves on both sides is the first The second heat utilization side heat exchanger is connected to bypass the first expansion device and the intermediate heat exchanger, and the second heat utilization side heat exchanger is connected to the second heat utilization side heat exchanger via the intermediate heat exchanger. The second medium is circulated to circulate the second medium.

Further, a compressor, a first utilization side heat exchanger, a rectifying device for keeping a flowing direction of the refrigerant to the expansion device to the intermediate heat exchanger for exchanging heat between the refrigerant and the second medium,
The intermediate heat exchanger, the expansion device, and the heat source side heat exchanger are sequentially connected via the rectifying device to form a cycle for circulating the refrigerant, and the second utilization side heat exchanger is connected via the intermediate heat exchanger. It is connected and is connected to the second utilization side heat exchanger so as to circulate the second medium.

Further, a rectifying device for making the flowing direction of the refrigerant to the compressor, the first use side heat exchanger, the intermediate heat exchanger for exchanging heat between the refrigerant and the second medium constant, and the rectifying device. The intermediate heat exchanger, the expansion device, and the heat source side heat exchanger are sequentially connected through the device to form a cycle for circulating the refrigerant, and the pipe provided with the flow rate control valve bypasses the first use side heat exchanger. And the second use side heat exchanger is connected via the intermediate heat exchanger, and the second medium is circulated through the second use side heat exchanger.

Further, a compressor, a first utilization side heat exchanger, an intermediate heat exchanger and a rectifying device for making the flow direction of the refrigerant to the expansion device constant, an intermediate heat exchanger and an expansion device via the rectification device, and a heat source. A side heat exchanger is sequentially connected, and a reservoir equipped with two-way valves on both sides is connected so as to bypass the first use side heat exchanger and the intermediate heat exchanger, and a cycle for circulating the refrigerant is performed. A pipe that is configured to connect the second use side heat exchanger through an intermediate heat exchanger that exchanges heat between the refrigerant and the second medium and circulate the second medium through the second use side heat exchanger. Is.

Further, the pipe provided with the flow rate control valve, the first expansion device, the intermediate heat exchanger, and the second utilization side heat exchanger are removed,
It is set to be attachable.

Further, the reservoir provided with the two-way valves on both sides, the first expansion device, the intermediate heat exchanger, and the second utilization side heat exchanger are detachable and attachable.

Further, by changing the opening of the first expansion device, the state of the refrigerant flowing into the intermediate heat exchanger during the heating operation can be varied within the range from the gas-liquid mixed two-phase flow to the superheated gas. ..

[0015]

With the above-mentioned configuration, for example, the first utilization side heat exchanger can be used as an air flow air conditioning unit and the second utilization side heat exchanger can be used as a radiation air conditioning unit. During heating operation, one or two expansion devices should be fully opened or appropriately throttled.When using the second heat exchanger on the second use side, heat exchange on the second user side via the intermediate heat exchanger. The second medium can be circulated in the vessel (the second medium is not circulated when the second utilization side heat exchanger is not used). At this time, in a configuration in which a bypass pipe provided with a flow rate control valve in the middle is connected, the opening of the flow rate control valve is adjusted according to operating conditions, and in a configuration in which a reservoir with two-way valves on both sides is connected, Open and close two two-way valves according to operating conditions. As a result, it becomes possible to perform air conditioning by air flow alone or air flow radiation combined.

During the cooling operation, when one or two expansion devices are fully opened or appropriately throttled and the second utilization side heat exchanger is used, the second utilization side heat is passed through the intermediate heat exchanger. A second medium can be circulated in the exchanger. (When the second use side heat exchanger is not used, the second medium is not circulated.) At this time, if a bypass pipe provided with a flow rate control valve is connected in the middle, the flow rate control valve should be fully closed. Also, when a reservoir having two-way valves on both sides is connected, the two two-way valves are opened and closed according to the operating conditions. As a result, it becomes possible to perform air conditioning by air flow alone or air flow radiation combined. At this time, the second use side heat exchanger circulates the second medium and radiates heat to the room when the lower part of the room is too cold, and thus cooling operation can be performed without the room being too cold.

During the dehumidifying operation, one or two throttle devices are fully opened or appropriately throttled to suppress the air flow rate of the air conditioning, and the second heat exchanger of the second use side is connected to the second heat exchanger of the second side via the intermediate heat exchanger. Circulate the two media. At this time, if a bypass pipe with a flow rate control valve is connected in the middle, the flow rate control valve should be fully closed, and the operating conditions should also be met when a reservoir with two-way valves on both sides is connected. Since the two two-way valves are opened and closed in accordance with the above, the second heat exchanger on the use side can radiate heat equivalent to the heat exchange amount in the intermediate heat exchanger, enabling dehumidifying operation without overcooling the room. Become.

As described above, there are various air-conditioning methods such as airflow and radiation, and there are temperature levels suitable for each air-conditioning method. However, a plurality of air-conditioners having different temperature levels are appropriately combined. By doing so, it becomes possible to realize comfort and energy saving at the same time.

[0019]

Embodiments of the present invention will be described below with reference to the drawings. 1 to 4 show a first embodiment of the present invention. FIG. 1 is a cycle configuration diagram, FIG. 2 is a Mollier diagram during heating operation in the cycle configuration of FIG. 1, and FIG. FIG. 4 is a Mollier diagram during the cooling operation in the cycle configuration, and FIG. 4 is a Mollier diagram during the dehumidifying operation in the cycle configuration in FIG.

In FIG. 1, 1 is a compressor, 2 is a four-way valve,
3 is a first heat exchanger on the use side, 4 is a first expansion device having functions of restricting bidirectional flow and capable of fully opened state, 5 is an intermediate heat exchanger for exchanging heat between the refrigerant and the second medium, and 6 is bidirectional A second throttle device having a function capable of controlling the flow throttle and fully opening, 7 is a heat source side heat exchanger, 8 is an accumulator for preventing liquid return to the compressor, 9 is a flow rate that can be fully closed halfway It is a bypass pipe provided with a control valve 10 (acting as a two-way valve) and connected so as to bypass the first utilization side heat exchanger 3 and the first expansion device 4. A cycle that circulates is configured.
Further, 12 is a second utilization side heat exchanger, 11 is a pump, which is connected to the intermediate heat exchanger 5 through a pipe and constitutes a cycle for circulating the second medium. That is,
This is a cycle configuration in which the cycles in which the refrigerant of the pump and the second medium circulate are combined so as to exchange heat via the intermediate heat exchanger 5.

Next, the operation during the heating operation, the cooling operation and the dehumidifying operation in the first embodiment configured as described above will be described with reference to the Mollier diagrams shown in FIGS. 2 to 4. To do. First, during the heating operation, when the second utilization side heat exchanger 12 is used when the first expansion device 4 is fully opened and the second expansion device 6 is appropriately throttled, that is, in the state of an appropriate opening degree. The flow control valve 10 is operated so that the opening degree is adjusted according to the operating conditions and the pump 11 is started. By setting each device in this way, the refrigerant branches after passing through the compressor 1 and the four-way valve 2, and one of them flows in the order of the first use-side heat exchanger 3 and the first expansion device 4,
The other flows through the bypass pipe 9 and joins before the intermediate heat exchanger 5 to form a gas-liquid mixed two-phase flow. Then, the two-phase flow of the gas-liquid mixture flows through the intermediate heat exchanger 5, and then the second expansion device 6, the heat source side heat exchanger 7, the four-way valve 2, and the accumulator 8. At this time, the second medium is circulated between the intermediate heat exchanger 5 and the second utilization side heat exchanger 12 by the pump 11, but the refrigerant and the second medium are heat-exchanged in the intermediate heat exchanger 5, The heat exchanged in the utilization heat exchanger is utilized.

That is, in the Mollier diagram shown in FIG. 2, the refrigerant is compressed by the compressor 1 into high-temperature high-pressure gas as indicated by points A ₁ to A ₂ of low-temperature low-pressure gas, and the four-way valve 2
In bifurcated after passing, one first utilization-side heat exchanger 3, A ₃
As shown by the point A _{4 from the} point, heat is radiated from the superheated region to the saturated region and further to the supercooled region to be condensed, and reaches the confluence point X shown in FIG. 1 through the first expansion device 4. Further, at the confluence point X, it merges with the other high-temperature and high-pressure gas to become the saturated refrigerant shown by point A ₅ . After this merging, the intermediate heat exchanger 5 radiates heat from the saturated region to the supercooled region and condenses as indicated by points A ₅ to A ₆ . In this case, the state of the refrigerant flowing into the intermediate heat exchanger 5 becomes a two-phase flow, and the heat transfer coefficient here can be improved. After that, the refrigerant is decompressed and expanded by the second expansion device 6 as shown from A ₆ point to A ₇ point, then enters the heat source side heat exchanger 7 and absorbs heat and evaporates as shown from A ₇ point to A ₈ point. , the four-way valve 2, through the accumulator 8 is sucked into the compressor 1 in a state of low temperature and low pressure gas indicated by _point a.
When the second use-side heat exchanger 12 is not used, the flow control valve 10 is fully closed and the pump 11 is stopped, so that the refrigerant does not flow through the bypass pipe 9 and the second medium also flows between the intermediate heat exchanger 5 and the second medium. Since it does not circulate between the two usage-side heat exchangers 12, normal heating operation is performed.

In FIG. 2, the heating operation coefficient, which represents the energy efficiency of the cycle in the heating operation when the second heat exchanger on the use side is used, has the above-mentioned points as shown in equation 1 when the bypass amount is α. It is calculated by the difference of enthalpy h at.

[0024]

[Equation 1]

In this case, the amount of heat obtained in the first utilization side heat exchanger 3 is (1-α) in terms of the enthalpy difference from the A ₃ point to the A ₄ point.
The heat radiation amount in the first usage-side heat exchanger 3 decreases in proportion to the bypass amount. However, as the bypass amount increases, the A ₅ point enters the saturation region and the dryness increases. Therefore, since the intermediate heat exchanger 5 from the improvement of heat transfer coefficient can be efficiently heat exchanger until the supercooling region, A ₅
The enthalpy difference between the points A ₆ and A _{6 is set} to be large, and the intermediate heat exchanger 5
It is possible to increase the amount of heat exchange in the air conditioner, improve the heating operation coefficient as compared with the normal cycle of only airflow air conditioning, and realize energy saving.

Here, for example, taking an air flow heating unit for exchanging heat between the first use side heat exchanger 3 and room air, and a floor heating unit having a pipe for the second use side heat exchanger 12 provided on the floor. Think When the second use side heat exchanger 12 is not used, only the air flow heating by the first use side heat exchanger 3 is performed, but since the rising speed of the temperature is fast, for example, it would be desirable to return from a cold outdoor place and heat rapidly. It is effective in all cases. When using the second usage-side heat exchanger 12, combined operation of airflow heating and floor heating can be performed. At this time, the air volume of the first utilization side heat exchanger 3 is suppressed to a slight air flow so that the warm air does not directly hit the human body, and the confluence point X shown in the cycle configuration diagram of FIG. As a result of the flow, since the heat transfer coefficient in the intermediate heat exchanger 5 can be improved, it is possible to secure a sufficient amount of heat radiation in the second usage-side heat exchanger 12, and this makes it possible to obtain a sufficient amount of heat from the surface in contact with the floor. It will be warmed up, and it will be possible to create a comfortable heating condition such as cold head heat.

Further, in order to obtain the amount of heat radiated from the second use side heat exchanger 12 for further floor heating, the air flow rate of the first use side heat exchanger 3 for airflow heating can be suppressed to no wind or a small amount. , Or increase the amount of refrigerant flowing through the bypass pipe 9,
The refrigerant state at the confluence point X shown in the cycle configuration diagram of FIG.
Since the intermediate heat exchanger 5 can exchange heat from the high-temperature superheat region by setting the superheat region to be the overheated gas, it becomes possible to increase the amount of heat released in the second use-side heat exchanger 12 to operate. ..

As described above, during heating operation, it is possible to select the air-conditioning method, air-flow only, air-flow floor heating combined, or floor heating-only air conditioning method according to the indoor air conditioning status and the user's work status, and a comfortable heating status. It becomes possible to make.

During the cooling operation, the second expansion device 6 is fully opened, the first expansion device 4 is appropriately throttled, the flow rate control valve 10 is set fully closed, and the pump 11 is stopped to operate. .. By setting in this way, the refrigerant is the compressor 1, the four-way valve 2, the heat source side heat exchanger 7, the second expansion device 6,
The intermediate heat exchanger 5, the first expansion device 4, the first utilization side heat exchanger 3, the four-way valve 2, and the accumulator 8 flow in this order. At this time, in the Mollier diagram shown in FIG. 3, the refrigerant is compressed by the compressor 1 from the low temperature low pressure gas B ₁ to the high temperature high pressure gas indicated by the point B ₂ , and passes through the four-way valve 2 and the second expansion device 6. rear,
The heat source side heat exchanger 7 and the intermediate heat exchanger 5 radiate heat and condense from the superheat region to the saturation region and further to the supercooling region as indicated by points B ₃ to B ₄ . Then, after being decompressed and expanded by the first expansion device 4 as indicated by points B ₄ to B ₅ , it enters the first use side heat exchanger 3 and absorbs heat and evaporates as indicated by points B ₅ to B _6. and four-way valve 2, is sucked into the compressor 1 in the state of the low-pressure low-temperature gas showing through the accumulator 8 at _one point B. As a result, a normal cooling operation can be performed by using the first utilization side heat exchanger 3 as an airflow cooling unit.

In FIG. 3, the cooling operation coefficient representing the energy efficiency of the cycle in the cooling operation is obtained by the enthalpy h difference at each of the above points, as shown in equation 2.

[0031]

[Equation 2]

In the cooling operation, the pump 11
To start the intermediate heat exchanger 5 and the second use side heat exchanger 12
By circulating the second medium through the second medium, the second use-side heat exchanger 12 can be used as a subcooler to operate the cycle. At this time, in the Mollier diagram shown in FIG. 3, the refrigerant radiates and cools from the heat source side heat exchanger 7 to the B ₃ point to the B ₄ point, and then passes through the second expansion device 6 and further from the B ₄ point. B It is cooled to ₇ points. Next, after decompressing and expanding by the first expansion device 4 as shown from B ₇ point to B ₈ point, it enters the first use side heat exchanger 3 and absorbs heat and evaporates as shown from B ₈ point to B ₆ point. To do. In this case, the cooling operation coefficient is obtained by the equation 3.

[0033]

[Equation 3]

Here, q is a heat radiation amount per unit mass of the refrigerant from the second utilization side heat exchanger 12 to the room. In this case, comparing the cooling operation coefficients of the equation 3 and the equation 2, the equation 3 is the cooling amount by subtracting q from the enthalpy difference from the B ₈ point to the B ₅ point in the Mollier diagram shown in FIG. The coefficient of operation increases and energy is saved.

Consider, for example, an airflow cooling unit for exchanging heat between the first use side heat exchanger 3 and room air, and a floor heating unit for providing the second use side heat exchanger 12 with a pipe on the floor. When the second usage-side heat exchanger 12 is not used, cooling is performed only by normal air flow, and in some cases, cool air moves downward and the floor surface temperature becomes too low. When the second utilization side heat exchanger 12 is used to compensate for this, the floor surface can be warmed up, and a comfortable cooling operation can be realized without the floor surface being over-cooled.

Next, during the dehumidifying operation, the flow control valve 10 is fully closed, the second expansion device 6 is fully open, and the first expansion device 4 is throttled to an appropriate opening degree to start the pump 11. ,
The same refrigerant flow path is used as in the case of using the second usage-side heat exchanger 12 in the cooling operation described above. At this time, in the Mollier diagram shown in FIG. 4, the refrigerant flows from the point C _{1 to the} point C ₂ by the compressor 1.
After being compressed into the high-temperature high-pressure gas as shown by the point and passing through the four-way valve 2, the heat source side heat exchanger 7 and the intermediate heat exchanger 5 show from the superheat region to the saturation region as shown from the C ₃ point to the C ₄ point. It radiates heat and condenses in the supercooled area. Then, after decompressing and expanding by the first expansion device 4 as indicated by points C ₄ to C ₅ , it enters the first heat exchanger 3 on the utilization side and absorbs heat and evaporates as indicated by points C ₅ to C _6. , 4 way valve 2 and accumulator 8 to C ₁
The state shown by the points is taken into the compressor 1.

Consider, for example, a floor heating unit in which the first utilization side heat exchanger 3 is an air flow air conditioning unit and the second utilization side heat exchanger 12 is provided with a pipe on the floor. In the above dehumidification operation, dehumidification by airflow and heating by floor heating are performed, and thus comfortable dehumidification can be realized without lowering the temperature in the room.

Further, by using the intermediate heat exchanger 5 as a subcooler, the intermediate heat exchanger 5 is used in the same manner as in the case of using the second utilization side heat exchanger 12 in the cooling operation described above. It is possible to increase the amount obtained by subtracting the heat radiation amount from the second use side heat exchanger 12 to the room from the enthalpy difference corresponding to the heat exchange amount, increase the coefficient of operation in the dehumidifying operation, and realize comfort and energy saving. it can.

In the cycle configuration shown in FIG. 1, the bypass pipe 9 provided with the flow rate control valve 10 in the middle is also configured to bypass the first utilization side heat exchanger 3 as shown by the broken line. By performing the same operations for heating, cooling, and dehumidifying as described above, it is possible to obtain the same operations and effects as those for the heating, cooling, and dehumidifying operations.

With the cycle configuration shown in FIG. 1 described above,
When the second use-side heat exchanger 12 is no longer needed, the bypass pipe 9, the first expansion device 4, the intermediate heat exchanger 5, the pump 11 surrounded by the one-dot chain line and having the flow rate control valve 10 in the middle. Even if the second heat exchanger 12 on the use side is removed and the points A and B, and the points C and D shown in the cycle configuration diagram of FIG. 1 are connected, only the first heat exchanger 3 on the first side is used for indoor air conditioning. It has a cycle configuration that allows

A second embodiment of the present invention is shown in FIG. First, the bypass pipe 9 and the flow rate control valve 10 indicated by broken lines in FIG.
The cycle configuration excluding is explained. In this cycle configuration, in the cycle configuration shown in FIG. 1, the bypass pipe 9 provided with the flow rate control valve 10 in the middle is removed, the expansion device is made one, and the refrigerant flow to the intermediate heat exchanger 5 and the expansion device 13. A rectifying device 14 for keeping the direction constant is provided. The rectifying device 14 is configured as shown in FIG. 5 by combining four check valves, and the outlet side of the first usage-side heat exchanger 3 and the inlet side of the heat-source-side heat exchanger 7 are respectively provided with the check valves. The intermediate heat exchanger 5 is connected in the middle, and the inlet side and the outlet side of the intermediate heat exchanger 5 are connected at the upper and lower portions, respectively. The flow direction of the refrigerant is determined only in one direction when the high-pressure refrigerant flows from the first usage-side heat exchanger 3, and the intermediate heat exchanger 5
Flow into. The refrigerant having a low pressure in the expansion device 13 flows into the rectifying device 14 again. Next, there are two flowing directions, but since one of them has a high pressure, only one flowing direction is determined, and the flowing into the heat source side heat exchanger 7. Even when a high-pressure refrigerant flows from the heat-source-side heat exchanger 7, the same operation as above determines the flowing direction of the refrigerant. As a result, the intermediate heat exchanger 5 and the expansion device 13 can always be poured from the same direction.

The operation during each of the heating operation, the cooling operation, and the dehumidifying operation will be described below. During the heating operation, by appropriately throttling the expansion device 13, the refrigerant is compressed by the compressor 1, the four-way valve 2, the first use side heat exchanger 3, the rectifying device 14, the intermediate heat exchanger 5, the expansion device 13, the rectifying device. 14, the heat source side heat exchanger 7, the four-way valve 2, and the accumulator 8 in this order, and when using the second utilization side heat exchanger 12, the pump 11
To start the intermediate heat exchanger 5 and the second use side heat exchanger 12
A second medium is circulated between. Further, when the second utilization side heat exchanger 12 is not used, the pump 11 is stopped and the second medium is operated so as not to circulate between the intermediate heat exchanger 5 and the second utilization side heat exchanger 12.

Consider, for example, the case where the first utilization side heat exchanger 3 is an airflow air conditioning unit and the second utilization side heat exchanger 12 is a floor heating unit having a pipe on the floor. When using the second usage-side heat exchanger 12, combined operation of airflow heating and floor heating can be performed. At this time, the air volume of the first use-side heat exchanger 3 is suppressed to a slight amount so that the warm air does not directly hit the human body, and the amount of heat released from the second use-side heat exchanger 12 is increased to heat the floor. By increasing the capacity, it becomes possible to create a comfortable heating condition such as cold head heat. Further, when the second use side heat exchanger 12 is not used, only the air flow heating by the first use side heat exchanger 3 is performed, but since the rising speed of the temperature is high, for example, when returning from a cold outdoor, the heating is performed rapidly. It is also effective when you want to.

During the cooling operation, by appropriately throttling the expansion device 13, the refrigerant is compressed by the compressor 1, the four-way valve 2, the heat source side heat exchanger 7, the rectifying device 14, the intermediate heat exchanger 5, the expansion device 13,
The rectifying device 14, the first use-side heat exchanger 3, the four-way valve 2, and the accumulator 8 flow in this order, and when the second use-side heat exchanger 12 is used, the pump 11 is started, and the intermediate heat exchanger 5 The second medium is circulated between the second heat exchanger 12 and the second use side heat exchanger 12. Further, when the second utilization side heat exchanger 12 is not used, the pump 11 is stopped and the second medium is operated so as not to circulate between the intermediate heat exchanger 5 and the second utilization side heat exchanger 12.

During the dehumidifying operation, the expansion device 13 is appropriately throttled so that the refrigerant is compressed by the compressor 1, the four-way valve 2, the heat source side heat exchanger 7, the rectifying device 14, the intermediate heat exchanger 5, the expansion device 13,
The rectifying device 14, the first use-side heat exchanger 3, the four-way valve 2, and the accumulator 8 flow in this order, the pump 11 is started, and the second medium is provided between the intermediate heat exchanger 5 and the second use-side heat exchanger 12. Circulate.

By performing the above operations during the cooling and dehumidifying operations, it is possible to obtain the same operations and effects as those during the cooling and dehumidifying operations described in the embodiment of FIG.

In the cycle configuration shown in FIG. 5, when the bypass pipe 9 provided with the flow rate control valve 10 in the middle is provided as shown by the broken line to make the cycle in which the first use side heat exchanger 3 is bypassed. However, in each operation of heating, cooling, and dehumidifying, by adding the operation described below to the operation described above, the same operation and effect as each operation of the embodiment of FIG. 1 can be obtained. .. That is, during heating operation,
When the second use side heat exchanger 12 is used, the opening degree of the flow rate control valve 10 is adjusted according to operating conditions, and when the second use side heat exchanger 12 is not used, the flow rate control valve 10 is fully closed. To do. Further, during the cooling and dehumidifying operations, the flow rate control valve 10 is always fully closed.

A third embodiment of the present invention will be described with reference to FIG. The cycle configuration shown in FIG. 6 is different from the cycle configuration shown in FIG. 1 in that instead of providing the bypass pipe 9 provided with the flow rate control valve 10 on the way, a reservoir 16 provided with two-way valves 15 and 17 on both sides is provided. The cycle is configured so as to bypass the first utilization side heat exchanger 3, the first expansion device 4, the intermediate heat exchanger 5, and the second expansion device 6.

The operation in each of the heating operation, the cooling operation, and the dehumidifying operation will be described below. During the heating operation, the first expansion device 4 is in a fully open state without being expanded, and the second expansion device 6 is appropriately expanded so that the refrigerant is the compressor 1, the four-way valve 2, the first use side heat exchanger 3, the first expansion device. Device 4, intermediate heat exchanger 5,
The second expansion device 6, the heat source side heat exchanger 7, the four-way valve 2, and the accumulator 8 flow in this order. When using the second utilization side heat exchanger 12, the pump 11 is started to circulate the second medium between the intermediate heat exchanger 5 and the second utilization side heat exchanger 12, and the two-way valve 17 is used. Is closed and the two-way valve 15 is opened. At this time, since the inside of the reservoir 16 is on the high pressure side, the refrigerant accumulates, and when the amount of the refrigerant reaches a predetermined amount, the two-way valve 15 is closed. As a result, the amount of refrigerant in the cycle becomes insufficient,
Since the subcooling cannot be obtained in the first use side heat exchanger 3,
The state of the refrigerant flowing into the intermediate heat exchanger 5 can be made into a two-phase flow. When the second use side heat exchanger 12 is not used, the two-way valve 15 is closed, the two-way valve 17 is opened, and the pump 11 is stopped. At this time, since the inside of the reservoir 16 is on the low pressure side, the amount of refrigerant decreases, and when the amount of refrigerant reaches a predetermined amount, the two-way valve 17 is closed. Thereby, the amount of refrigerant in the cycle can be made appropriate.

During the cooling operation, the second expansion device 6 is fully opened,
The first expansion device 4 appropriately restricts the refrigerant, and the refrigerant is compressed by the compressor 1, the four-way valve 2, the heat source side heat exchanger 7, the second expansion device 6, the intermediate heat exchanger 5, the first expansion device 4, and the first utilization side heat. The exchanger 3, the four-way valve 2 and the accumulator 8 are flowed in this order, the two-way valve 15 is closed, the two-way valve 17 is opened, and the two-way valve 17 is closed when the amount of refrigerant in the cycle becomes appropriate. Next, when the second utilization side heat exchanger 12 is used, the pump 11 is started to circulate the second medium between the intermediate heat exchanger 5 and the second utilization side heat exchanger 12. Further, when the second utilization side heat exchanger 12 is not used, the pump 11 is stopped and the second medium is not circulated.

During the dehumidifying operation, the second expansion device 6 is fully opened,
The first expansion device 4 appropriately restricts the refrigerant, and the refrigerant is compressed by the compressor 1, the four-way valve 2, the heat source side heat exchanger 7, the second expansion device 6, the intermediate heat exchanger 5, the first expansion device 4, and the first utilization side heat. The exchanger 3, the four-way valve 2 and the accumulator 8 are flowed in this order, the two-way valve 15 is closed, the two-way valve 17 is opened, and the two-way valve 17 is closed when the amount of refrigerant in the cycle becomes appropriate. Furthermore, the pump 11
To start the intermediate heat exchanger 5 and the second use side heat exchanger 12
A second medium is circulated between.

By operating as described above, it is possible to obtain the same effect as each operation of the cycle configuration shown in FIG.

As shown by the broken line, the two-way valve 1 is installed on both sides.
The reservoir 16 provided with 5, 17 is used as the first utilization side heat exchanger 3,
When the first expansion device 4 and the intermediate heat exchanger 5 are provided so as to be bypassed, the second expansion device 6 is fully opened and the first expansion device 4 is appropriately restricted only when the amount of refrigerant in the cycle is appropriate. Other than that, the same operation and effect can be obtained by performing the same operation as in each of the above operations.

Further, in the above-described cycle indicated by the broken line, when the second utilization side heat exchanger 12 is no longer needed, the reservoir surrounded by the alternate long and short dash line and provided with the two-way valves 15 and 17 on both sides. 16, the first use-side heat exchanger 3, the first expansion device 4, the intermediate heat exchanger 5, the pump 11, and the second use-side heat exchanger 12 are removed, and points E and F shown in the cycle configuration diagram shown in FIG. Point, even if the G point and the H point are connected, the first use side heat exchanger 3
It has a cycle configuration that allows air conditioning in the room.

A fourth embodiment of the present invention is shown in FIG. The cycle structure shown in FIG. 7 has a single expansion device in the cycle structure shown in FIG. 6, and has an intermediate heat exchanger 5 and a expansion device 1.
3 is provided with a rectifying device 14 that makes the flow direction of the refrigerant constant.

The operation in each of the heating operation, the cooling operation, and the dehumidifying operation will be described below. During the heating operation, by appropriately throttling the expansion device 13, the refrigerant is compressed by the compressor 1, the four-way valve 2, the first use side heat exchanger 3, the rectifying device 14, the intermediate heat exchanger 5, the expansion device 13, the rectifying device. 14, the heat source side heat exchanger 7, the four-way valve 2, and the accumulator 8 flow in this order. When using the second utilization side heat exchanger 12, the pump 11 is started to circulate the second medium between the intermediate heat exchanger 5 and the second utilization side heat exchanger 12, and the two-way valve 17 is used. Is closed, the two-way valve 15 is opened, and when the amount of refrigerant reaches a predetermined amount, the two-way valve 15 is closed. As a result, the amount of refrigerant in the cycle becomes insufficient, and the degree of supercooling cannot be obtained in the first use-side heat exchanger 3, so that the state of the refrigerant flowing into the intermediate heat exchanger 5 can be made into a two-phase flow. .. When the second use side heat exchanger 12 is not used, the two-way valve 15 is closed, the two-way valve 17 is opened, the pump 11 is stopped, and the two-way valve 17 is closed when the amount of refrigerant in the cycle becomes appropriate. ..

During the cooling operation, by appropriately throttling the expansion device 13, the refrigerant is compressed by the compressor 1, the four-way valve 2, the heat source side heat exchanger 7, the rectifying device 14, the intermediate heat exchanger 5, the expansion device 1.
3, rectifying device 14, first use side heat exchanger 3, four-way valve 2,
The two-way valve 15 is closed, the two-way valve 17 is opened, and the two-way valve 17 is closed when the amount of refrigerant in the cycle becomes appropriate while the accumulator 8 flows in that order. Next, when the second utilization side heat exchanger 12 is used, the pump 11 is started to circulate the second medium between the intermediate heat exchanger 5 and the second utilization side heat exchanger 12. Further, when the second utilization side heat exchanger 12 is not used, the pump 11 is stopped and the second medium is not circulated.

During the dehumidifying operation, the expansion device 13 is appropriately throttled so that the refrigerant is compressed by the compressor 1, the four-way valve 2, the heat source side heat exchanger 7, the rectifying device 14, the intermediate heat exchanger 5, and the expansion device 1.
3, rectifying device 14, first use side heat exchanger 3, four-way valve 2,
The two-way valve 15 is closed, the two-way valve 17 is opened, and the two-way valve 17 is closed when the amount of refrigerant in the cycle becomes appropriate while the accumulator 8 flows in that order. Further, the pump 11 is started to circulate the second medium between the intermediate heat exchanger 5 and the second usage-side heat exchanger 12.

By the above operation, the same operation and effect as the cycle shown in FIG. 6 can be obtained at each operation.

[0060]

As described in detail above, according to the present invention, in the heat pump cycle for performing the heating operation, the cooling operation and the dehumidifying operation, the first and second utilization side heat exchangers are provided on the indoor side. The two heat exchangers on the use side are provided with, for example, an air flow system or a radiation system to control different temperature levels suitable for each. As a result, there is an effect that a comfortable state can be realized according to various activity states of a person and further energy saving can be achieved.

[Brief description of drawings]

FIG. 1 is a cycle configuration diagram showing a first embodiment of the present invention.

FIG. 2 is a Mollier diagram during heating operation in the cycle configuration diagram of FIG.

FIG. 3 is a Mollier diagram during cooling operation in the cycle configuration diagram of FIG.

FIG. 4 is a Mollier diagram during the dehumidifying operation in the cycle configuration diagram of FIG. 1.

FIG. 5 is a cycle configuration diagram showing a second embodiment of the present invention.

FIG. 6 is a cycle configuration diagram showing a third embodiment of the present invention.

FIG. 7 is a cycle configuration diagram showing a fourth embodiment of the present invention.

FIG. 8 is a cycle configuration diagram showing a conventional example.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Compressor, 3 ... 1st utilization side heat exchanger, 4 ... 1st expansion device, 5 ... Intermediate heat exchanger, 6 ... 2nd expansion device, 7 ... Heat source side heat exchanger, 9 ... Bypass pipe, 11 ... pump, 12 ... second use side heat exchanger, 13 ... throttle device, 14 ... rectifying device, 1
5, 17 ... Two-way valve, 16 ... Reservoir.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Norio Sudo 800 Tomita, Ohira-machi, Shimotsuga-gun, Tochigi Prefecture Tochigi Plant, Hitachi Ltd.

Claims (8)

[Claims] 1. An air conditioner having a first utilization side heat exchanger and a second utilization side heat exchanger in a room, comprising a compressor, a first utilization side heat exchanger, a first expansion device, a refrigerant and a second medium. The intermediate heat exchanger for exchanging heat, the second expansion device, the heat source side heat exchanger are sequentially connected to form a cycle for circulating the refrigerant, and the pipe provided with the flow rate control valve is used for the first side heat exchange. Characterized in that it is connected so as to bypass the heat exchanger, the second use side heat exchanger is connected through the intermediate heat exchanger, and the second medium is circulated through the second use side heat exchanger. And an air conditioner. 2. An air conditioner having a first utilization side heat exchanger and a second utilization side heat exchanger in a room, comprising a compressor, a first utilization side heat exchanger, a first expansion device, a refrigerant and a second medium. The intermediate heat exchanger for exchanging heat, the second expansion device, and the heat source side heat exchanger are sequentially connected to constitute a cycle for circulating the refrigerant, and the reservoir provided with two-way valves on both sides is the first The second heat utilization side heat exchanger is connected to bypass the first expansion device and the intermediate heat exchanger, and the second heat utilization side heat exchanger is connected to the second heat utilization side heat exchanger via the intermediate heat exchanger. An air conditioner characterized in that a pipe is arranged so as to circulate a second medium in the air conditioner. 3. An air conditioner having a first utilization side heat exchanger and a second utilization side heat exchanger in a room, for exchanging heat between a compressor, a first utilization side heat exchanger, a refrigerant and a second medium. A rectifying device for making the flowing direction of the refrigerant to the intermediate heat exchanger to the expansion device constant, and the intermediate heat exchanger and the expansion device via the rectification device, and the heat source side heat exchanger are sequentially connected to supply the refrigerant. A circulation cycle is constituted, and a second utilization side heat exchanger is connected via the intermediate heat exchanger, and piping is provided so as to circulate the second medium in the second utilization side heat exchanger. Air conditioner to do. 4. An air conditioner having a first utilization side heat exchanger and a second utilization side heat exchanger in a room, for exchanging heat between a compressor, a first utilization side heat exchanger, a refrigerant and a second medium. A rectifying device that keeps the flow direction of the refrigerant to the intermediate heat exchanger to the expansion device constant, and the intermediate heat exchanger, the expansion device, and the heat source side heat exchanger are sequentially connected through the rectification device to circulate the refrigerant. And connecting a pipe provided with a flow rate control valve so as to bypass the first use side heat exchanger, and connecting the second use side heat exchanger via the intermediate heat exchanger. An air conditioner characterized in that it is arranged so that a second medium is circulated in the second usage-side heat exchanger. 5. An air conditioner having a first utilization side heat exchanger and a second utilization side heat exchanger in a room, wherein a refrigerant is supplied to the compressor, the first utilization side heat exchanger, the intermediate heat exchanger and the expansion device. The first use is a reservoir that has a two-way valve on both sides, in which a rectifying device that keeps the flow direction constant, an intermediate heat exchanger and a throttling device through the rectifying device, and a heat source side heat exchanger are sequentially connected. The side heat exchanger and the intermediate heat exchanger are connected so as to be bypassed to form a cycle for circulating the refrigerant, and the second use side heat exchange is performed through the intermediate heat exchanger in which the refrigerant and the second medium exchange heat. An air conditioner characterized in that a pipe is connected to the second utilization side heat exchanger so as to circulate the second medium. 6. The air conditioner according to claim 1, wherein the pipe provided with the flow rate control valve, the first expansion device, the intermediate heat exchanger, and the second heat exchanger on the second use side are set to be removable and attachable. .. 7. A reservoir having two-way valves on both sides, a first expansion device, an intermediate heat exchanger, and a second utilization side heat exchanger are removed,
The air conditioner according to claim 2, which is set to be attachable. 8. The state of the refrigerant flowing into the intermediate heat exchanger during the heating operation is made variable in the range of the two-phase flow of gas-liquid mixture to the superheated gas by changing the opening degree of the first expansion device. The air conditioner according to any one of 1 to 5.