JP2017198414A - Hot water supply air conditioning system - Google Patents

Abstract

An object of the present invention is to provide a hot water supply air-conditioning system capable of simultaneously performing cooling or heating by connecting a plurality of utilization units to a heat source unit, in which hot water can be supplied at all times. A heat source unit 20 supplies low-pressure refrigerant from a first inlet/outlet part 26 and returns the low-pressure refrigerant from a second inlet/outlet part 27, or supplies high-pressure refrigerant from a second inlet/outlet part 27 to the first inlet/outlet part 26. The structure is such that it is possible to switch between returning the high-pressure refrigerant. The hot water supply unit 40 is connected to one first port 26c and one second port 27c, and is connected to one first port 26c and one second port 27c. It has a refrigerant heat exchanger 41. The combustion heater 60 is built into the hot water supply unit 40 and includes a combustion burner 61 that heats water that is supplied via the water-refrigerant heat exchanger 41. [Selection diagram] Figure 1

Description

  The present invention relates to a hot water supply air conditioning system capable of simultaneously performing air conditioning and hot water supply.

  Conventionally, as described in Patent Document 1 (Japanese Patent Laid-Open No. 2000-55445), a plurality of utilization units can be connected to a single heat source unit having a large number of ports to perform air conditioning. There is an air conditioning system configured. In such an air conditioning system, heat can be simultaneously transferred from a plurality of usage-side units to one heat source unit, and cooling can be performed simultaneously at a plurality of locations using the plurality of usage-side units. In such an air conditioning system, heat can be simultaneously transferred from a single heat source unit to a plurality of usage-side units, and heating can be performed simultaneously at a plurality of locations using the plurality of usage-side units. Furthermore, by connecting a floor heating unit used only at the time of heating to the heat source unit, heating can be performed using the floor heating unit at the time of heating.

  However, in the case where a hot water supply unit that warms and supplies water regardless of the season is connected to such a heat source unit, hot water cannot be supplied by the hot water supply unit when cooling is performed using the utilization unit. Therefore, the hot water supply air conditioning system using the heat source unit as described above causes a time during which hot water cannot be supplied.

  An object of the present invention is to enable hot water supply to be always performed in a hot water supply air-conditioning system in which a plurality of utilization units are connected to a heat source unit and cooling is performed simultaneously or heating is performed simultaneously.

  A hot water supply air conditioning system according to a first aspect of the present invention includes a compressor, a cycle switching mechanism, a heat source heat exchanger, a first inlet / outlet portion, and a second inlet / outlet portion, and the compressor and the heat source heat exchanger are connected by the cycle switching mechanism. The flow path of the refrigerant passing therethrough is switched to supply the low-pressure refrigerant from the first inlet / outlet part and return the low-pressure refrigerant from the second inlet / outlet part, or supply the high-pressure refrigerant from the second inlet / outlet part and supply the high-pressure refrigerant from the first inlet / outlet part. A heat source unit configured to be able to switch between return and a plurality of first ports arranged in parallel at the first inlet / outlet portion, and a plurality of second ports arranged in parallel to the second inlet / outlet portion; The air-refrigerant heat is connected to one first port of the first part and one second port of the second inlet / outlet part, and exchanges heat between the refrigerant entering and leaving the first inlet / outlet part and the second inlet / outlet part and air. An air conditioning unit having an exchanger, and a first It is connected to the other first port of the inlet / outlet part and the other second port of the second inlet / outlet part, and performs heat exchange between the refrigerant entering and leaving the first inlet / outlet part and the second inlet / outlet part and water. A hot water supply unit having a water-refrigerant heat exchanger to be generated, and a combustion heating system including a combustion burner for increasing the temperature of water to be supplied via the hot water supply unit, which is built in or connected to the hot water supply unit With a vessel.

  According to the hot water supply air-conditioning system according to the first aspect, when the high pressure refrigerant is supplied from the second inlet / outlet part and the high pressure refrigerant is returned to the first inlet / outlet part, the water can be warmed using the water-refrigerant heat exchanger of the hot water supply unit. it can. When the cycle is switched by the cycle switching mechanism and the low-pressure refrigerant is supplied from the first inlet / outlet and the low-pressure refrigerant is returned from the second inlet / outlet, the water cannot be warmed using the water-refrigerant heat exchanger of the hot water supply unit. Sometimes hot water can be supplied using a combustion burner of a combustion heater. In this way, hot water can be supplied from the hot water supply air-conditioning system even if the cycle switching mechanism is used to switch between the cycle for heating the air conditioning unit and the cycle for performing cooling.

  The hot water supply air conditioning system according to a second aspect of the present invention is the hot water supply air conditioning system according to the first aspect, wherein the heat source unit is provided with a motor valve having a variable opening at each of the plurality of first ports of the first entrance / exit part. It is a thing.

  According to the hot water supply air-conditioning system according to the second aspect, if the air conditioning unit is connected to the first port and the second port, the refrigerant circulating through the air conditioning unit, the compressor, and the heat source heat exchanger using the motor operated valve of the first port. Thus, the number of the cooling / heating units and hot water supply units can be arbitrarily changed, for example, when there are three or more first ports and two second ports.

The hot water supply air conditioning system according to a third aspect of the present invention is the hot water supply air conditioning system according to the second aspect, wherein the heat source unit closes the first port and / or the second port to which the hot water supply unit is connected during the cooling cycle operation. Configured to be able to,
According to the hot water supply air-conditioning system according to the third aspect, the refrigerant returning from the first inlet / outlet portion to the second inlet / outlet portion during the cooling cycle operation is cold, but during the cooling cycle operation, the hot water supply unit is connected. Since 1 port and / or 2nd port can be closed, it can prevent that a cold refrigerant | coolant is supplied to a hot-water supply unit.

  The hot water supply air conditioning system according to a fourth aspect of the present invention is the hot water supply air conditioning system according to the third aspect, wherein the heat source unit is a motor-operated valve of a first port to which the hot water supply unit is connected when hot water supply of the hot water supply unit is unnecessary. Is configured to be opened by a predetermined opening.

  According to the hot water supply air-conditioning system according to the fourth aspect, it is possible to prevent the refrigerant from staying in the water-refrigerant heat exchanger by opening the motor-operated valve by a predetermined degree of opening and allowing the refrigerant to flow slightly through the hot water supply unit. it can.

  In the hot water supply air-conditioning system according to the first aspect of the present invention, hot water supply can always be performed in a hot water supply air-conditioning system in which a plurality of utilization units are connected to the heat source unit to simultaneously cool or simultaneously heat.

  In the hot water supply air conditioning system according to the second aspect of the present invention, the number of air conditioning units and hot water supply units can be arbitrarily changed, and the degree of freedom in system construction increases.

  In the hot water supply air-conditioning system according to the third aspect of the present invention, it is possible to prevent heat loss in the hot water supply unit during the cooling cycle operation and prevent energy efficiency from being lowered in the hot water supply unit.

  In the hot water supply air-conditioning system according to the fourth aspect of the present invention, it is possible to prevent the compressor from being damaged due to the refrigerant remaining in the water-refrigerant heat exchanger.

The circuit diagram which shows the structure of the hot water supply air conditioning system which concerns on embodiment. The perspective view which shows the external appearance of the heat-source unit of a hot-water supply air conditioning system. The perspective view which shows the 1st entrance / exit part and 2nd entrance / exit part of a heat-source unit. The block diagram which shows the control system of a hot water supply air conditioning system. The circuit diagram which shows the structure of the hot water supply air conditioning system which concerns on the modification 1A. The circuit diagram which shows the structure of the hot water supply air conditioning system which concerns on the modification 1B. The circuit diagram which shows the structure of the hot water supply air conditioning system which concerns on the modification 1C. The circuit diagram which shows the structure of the hot water supply air conditioning system which concerns on modification 1D.

(1) Overall configuration (1-1) Refrigerant circuit of hot water supply air conditioning system The overall configuration of a hot water supply air conditioning system according to an embodiment of the present invention will be described with reference to FIG. FIG. 1 shows a refrigerant circuit of a hot water supply air conditioning system. The hot water supply air conditioning system 10 is a multi-type hot water supply air conditioning system, and is configured such that two air conditioning units 30 and one hot water supply unit 40 are connected in parallel to one heat source unit 20. In addition, although two more use side units, such as another air conditioning unit 30, the hot water supply unit 40, and a floor heating unit, can be connected to the heat source unit 20, description is abbreviate | omitted here.

  Here, an example in which two air conditioning units 30 are connected to one heat source unit 20 is shown, but if the setting of the number of liquid pipe connection ports and gas pipe connection ports described later is changed, they can be connected. The upper limit value of the number of air conditioning units 30 and hot water supply units 40 can be changed. In addition to the cooling / heating unit 30 and the hot water supply unit 40, a floor heating unit having a water-refrigerant heat exchanger and a pipe for passing hot water through the floor may be connected. Further, even in the hot water supply air conditioning system 10 configured as in this embodiment, it is not always necessary to connect three or more air conditioning units 30 and hot water supply units 40 to one heat source unit 20, and within the number of ports. Any number of units can be connected. When the total number of connected air conditioning units 30 and hot water supply units 40 is less than the number of ports and the first ports 26a to 26e and the second ports 27a to 27e are not connected to the air conditioning unit 30 or the hot water supply unit 40, connection What is not done is closed.

  The refrigerant circuit 11 of the hot water supply air conditioning system 10 includes a compressor 21, a four-way switching valve 22, a heat source heat exchanger 23, five motor-operated valves 24, an air-refrigerant heat exchanger 31 or a water-refrigerant heat exchanger 41 in this order. It is connected. In the refrigerant circuit 11, a vapor compression refrigeration cycle is performed. When the refrigerant circuit 11 is viewed in more detail, the heat source side refrigerant circuit 12 formed in the heat source unit 20 and the use side refrigerant circuit 13a formed in the air conditioning unit 30 or the heat source side refrigerant circuit 12 and The utilization side refrigerant circuit 13b formed in the hot water supply unit 40 is connected in parallel by the connecting portion 20a.

  The heat source side refrigerant circuit 12 of the heat source unit 20 and the use side refrigerant circuit 13a of the two air conditioning units 30 are connected by two liquid side refrigerant communication pipes 17a and two gas side refrigerant communication pipes 17b. Similarly, the heat source side refrigerant circuit 12 and the use side refrigerant circuit 13b of the hot water supply unit 40 are also connected by another liquid side refrigerant communication pipe 17a and another gas side refrigerant communication pipe 17b.

  The gas side refrigerant communication pipe 17 b is connected to the second inlet / outlet part 27 of the heat source unit 20, and one ends of the three gas side refrigerant communication pipes 17 b are connected to the three second ports 27 a to 27 c of the second inlet / outlet part 27. Has been. In the second inlet / outlet portion 27, the five second ports 27 a to 27 e are combined into one, and the one gas pipe is connected to the four-way switching valve 22 through the gas side closing valve 18.

  The liquid side refrigerant communication pipe 17 a is connected to the first inlet / outlet part 26 of the heat source unit 20, and one ends of the three liquid side refrigerant communication pipes 17 a are connected to the three first ports 26 a to 26 c of the first inlet / outlet part 26. Has been. In the 1st entrance / exit part 26, five 1st ports 26a-26e are each connected to the one end side of five motor-operated valves 24a-24e, and the other end side of five motor-operated valves 24a-24e is put together into one liquid pipe. It is connected. In the first inlet / outlet portion 26, one liquid pipe connected to the other end side of the five electric valves 24 a to 24 e via the liquid side closing valve 19 is connected to the other end side of the heat source heat exchanger 23. Yes. One end side of the heat source heat exchanger 23 is connected to the four-way switching valve 22.

(1-2) Configuration of Heat Source Unit The heat source side refrigerant circuit 12 included in the heat source unit 20 includes a compressor 21, a four-way switching valve 22, a heat source heat exchanger 23, and an electric valve 24. In addition, the heat source unit 20 includes a compressor 21, four-way switching valve 22, five electric valves 24a to 24e, a heat source side fan 25 (see FIG. 4), and the like on the heat source side that controls the operation of the devices in the heat source unit 20. A control unit 28 is provided. The heat source side control unit 28 is connected to the use side control units 32 a and 32 b by the wiring group 15.

(1-2-1) Appearance of Heat Source Unit FIG. 2 is a perspective view showing an appearance of the heat source unit 20 as viewed from the upper right side on the front side. The heat source unit 20 includes a casing 29 and an entrance / exit cover 29g. The casing 29 includes a front plate 29a, a top plate 29b, a right side plate 29c, a left side plate (not shown), and a bottom plate (not shown). In addition, a grill 29d for covering the propeller 29f of the heat source side fan 25 is attached to the front plate 29a of the casing 29 in front of the opening 29e. The entrance / exit part cover 29g is a resin housing for covering the connection part 20a. As shown in FIG. 1, the gas side closing valve 18, the liquid side closing valve 19, the second inlet / outlet portion 27, the first inlet / outlet portion 26, the motor operated valve 24 and the wiring group 15 are provided in the inlet / outlet cover 29 g. A part is stored.

(1-2-2) Connection Portion In FIG. 3, in order to explain the connection portion 20a, the entrance / exit portion cover 29g is removed, and the configuration around the second entrance / exit portion 27 and the first entrance / exit portion 26 is obliquely rearward and upward. The state seen from the front is shown. FIG. 4 shows the connecting portion 20a from which the entrance / exit cover 29g, the wiring group 15 and the like are removed. In the connection part 20 a, the first entrance / exit part 26 is arranged on the side close to the casing 29, and the second entrance / exit part 27 is arranged on the side far from the casing 29. The connecting portion 20a includes an attachment member 29h formed by bending a metal plate. Five first ports 26a, 26b, 26c, 26d, and 26e that are arranged at equal intervals in the height direction are attached to the attachment member 29h, and five that are arranged at equal intervals in the height direction. Second ports 27a, 27b, 27c, 27d, and 27e are attached. Five electric valves 24a, 24b, 24c, 24d, and 24e are attached to the five first ports 26a, 26b, 26c, 26d, and 26e, respectively.

(1-3) Configuration of Air Conditioning / Heating Unit The air conditioning unit 30 includes an air-refrigerant heat exchanger 31 and a user side fan 33 (see FIG. 4) that constitute the user side refrigerant circuit 13a. The use-side fan 33 generates a flow of air that exchanges heat with the refrigerant in the air-refrigerant heat exchanger 31. The use-side fan 33 is configured to change the rotation speed of the fan in order to change the speed of the airflow. A use side control unit 32 a that controls the operation of the devices in the air conditioning unit 30 such as the use side fan 33 is provided.

(1-4) Configuration of Hot Water Supply Unit The hot water supply unit 40 includes a water-refrigerant heat exchanger 41, a circulation pump 42, and a hot water storage tank 44 that constitute the use side refrigerant circuit 13b. The hot water supply unit 40 includes a combustion heater 60 including a combustion burner 61 and a heat exchanging unit 62. In addition, the hot water supply unit 40 is provided with a use side control unit 32b for controlling devices in the hot water supply unit 40 such as the circulation pump 42 and the combustion burner 61.

  The circulation pump 42, the water-refrigerant heat exchanger 41, and the hot water storage tank 44 are disposed in the water circulation channel 45. For example, city water is supplied to the hot water storage tank 44 through a water supply pipe 46. The water supply pipe 46 is connected to the bottom 44 a of the hot water storage tank 44. Inside the hot water storage tank 44, hot water with a low density accumulates in the upper part 44b, and cold water with a high density accumulates in the bottom part 44a. By putting the cold water supplied from the water supply pipe 46 into the bottom 44 a of the hot water storage tank 44, the hot water in the upper portion 44 b is suppressed from being cooled by the supplied cold water. The circulation pump 42 is controlled by the use side control unit 32b, and can change the amount of circulating water. By stopping the circulation pump 42, the flow of water in the water circulation channel 45 can be stopped. The hot water supply channel 47 is a channel for supplying hot water from the upper portion 44 b of the hot water storage tank 44.

(1-5) Configuration of Combustion Heater The combustion heater 60 includes a combustion burner 61 and a heat exchange unit 62. The water or hot water flowing through the hot water supply passage 47 passes through the heat exchange unit 62. Water or hot water flowing through the heat exchanging section 62 can be heated by the combustion burner 61. Further, if the combustion burner 61 is turned off, the water in the hot water supply passage 47 can pass through without being heated by the heat exchanging unit 62. The combustion burner 61 is, for example, a combustion gas burner. A hot water supply terminal 48 such as a water faucet, a shower and a bathtub is connected downstream of the combustion heater 60 in the hot water supply passage 47.

(1-6) Configuration of Control Unit of Hot Water Supply Air Conditioning System The control unit 50 of the hot water supply air conditioning system 10 shown in FIG. 4 includes a heat source side control unit 28 and use side control units 32a and 32b. Information regarding the temperature of each part of the heat source unit 20 necessary for controlling the heat source unit 20 is transmitted from the various temperature sensors 51 provided in the heat source unit 20 to the heat source side control unit 28. Information on the temperature of each part of the heat source unit 20 includes, for example, the value of the outside air temperature sucked into the heat source unit 20, the value of the refrigerant temperature sucked into the compressor 21, and the temperature of the refrigerant discharged from the compressor 21. There are values. Further, the heat source side control unit 28 is discharged from various pressure sensors 52 provided in the heat source unit 20, for example, information related to the refrigerant pressure of each part of the heat source unit 20 necessary for controlling the heat source unit 20, for example, from the compressor 21. The refrigerant pressure value is transmitted. Further, information on the use side units such as the air conditioning unit 30 and the hot water supply unit 40 is transmitted to the heat source side control unit 28 from the use side control units 32a and 32b. The heat source unit 20 adjusts the rotation speed of the compressor 21, the switching of the four-way switching valve 22, the opening degree of the motor operated valve 24, and the rotation of the heat source side fan 25 based on the above information received by the heat source side control unit 28. Control of each device of the heat source unit 20 such as adjustment of the number is performed.

  The use-side control unit 32a includes information on the temperature of each part of the air conditioning unit 30 from various temperature sensors 53 provided in the air conditioning unit 30, for example, the value of the temperature of air sucked into the air conditioning unit 30 and the air-refrigerant heat exchanger The value of the temperature related to the refrigerant flowing through 31 is transmitted. In addition, information related to control is transmitted from the heat source side control unit 28 to the use side control unit 32 a of the air conditioning unit 30. The air conditioning unit 30 controls each device of the air conditioning unit 30 such as adjustment of the rotation speed of the usage side fan 33 based on the above information received by the usage side control unit 32a.

  In addition, information on the temperature of each part of the hot water supply unit 40 is transmitted to the use side control unit 32b from the hot water supply temperature sensor 54 and the plurality of hot water storage temperature sensors 55 provided in the hot water supply unit 40. In addition, information on control is transmitted from the heat source side control unit 28 to the use side control unit 32 b of the hot water supply unit 40. The hot water supply unit 40 controls each device of the hot water supply unit 40 such as adjusting the rotation speed of the circulation pump 42 based on the above-mentioned information received by the use side control unit 32b, and turning on / off the combustion burner 61 and adjusting the thermal power. The combustion heater 60 is controlled.

(2) Operation of Hot Water Supply Air Conditioning System During the cooling cycle operation in which the four-way switching valve 22 is switched to the solid line connection, the hot water supply air conditioning system 10 supplies the low-temperature low-pressure refrigerant from the first inlet / outlet portion 26 to the second inlet / outlet portion. The low-pressure refrigerant warmed from 27 is returned. On the contrary, during the heating cycle operation in which the four-way switching valve 22 is switched to the broken line connection, the hot water supply air conditioning system 10 supplies the high-temperature high-pressure refrigerant from the second inlet / outlet portion 27 and cools from the first inlet / outlet portion 26. Return the refrigerant.

(2-1) At the time of cooling cycle operation At the time of cooling cycle operation, the refrigerant that has evaporated by taking heat from, for example, indoor air blown by the use-side fan 33 by the air-refrigerant heat exchanger 31 in the plurality of air conditioning units 30 is the second entrance Returned from the second ports 27a and 27b arranged in parallel to the unit 27, respectively. The refrigerant returned from the second ports 27 a and 27 b is sucked into the compressor 21 via the four-way switching valve 22 and compressed by the compressor 21. The refrigerant compressed by the compressor 21 enters the heat source heat exchanger 23 via the four-way switching valve 22. The gas refrigerant that has entered the heat source heat exchanger 23 is condensed by, for example, applying heat to the outdoor air in the heat source heat exchanger 23, and then expanded via the motor-operated valves 24 a and 24 b, and in parallel with the first inlet / outlet portion 26. It is supplied to the plurality of air conditioning units 30 from the arranged first ports 26a, 26b. The refrigerant supplied from the first ports 26 a and 26 b enters each air-refrigerant heat exchanger 31.

  Further, during the cooling cycle operation, the refrigerant that has taken heat from the water circulated by the circulation pump 42 in the water-refrigerant heat exchanger 41 does not return from the second port 27 c arranged in parallel with the second inlet / outlet portion 27. In addition, the motor-operated valve 24c is closed. When the motor-operated valve 24 is closed, the refrigerant does not flow in the use-side refrigerant circuit 13b, so that the refrigerant cooled by the heat source heat exchanger 23 can be prevented from flowing to the water-refrigerant heat exchanger 41. In this case, since the water stored in the hot water storage tank 44 cannot be heated by the water-refrigerant heat exchanger 41, the temperature of the water stored in the hot water storage tank 44 is lower than the set temperature. In this case, when there is a request to supply hot water at a set temperature to the hot water supply terminal 48, the use side control unit 32 b burns and heats the hot water supplied from the hot water storage tank 44 to the hot water supply terminal 48 through the hot water supply passage 47. Warm up to set temperature by means of vessel 60. The use side control unit 32b performs on / off of the combustion burner 61 and control of thermal power so that the temperature of hot water supplied from the hot water supply terminal 48 becomes a set temperature.

(2-2) Heating cycle operation During the heating cycle operation, the first inlet / outlet portion 26 is, for example, a refrigerant that gives heat to, for example, indoor air blown by the use-side fan 33 by the air-refrigerant heat exchanger 31 in the plurality of air conditioning units 30. Are respectively returned from the first ports 26a and 26b arranged in parallel. The refrigerant returned from the first ports 26 a and 26 b is expanded via the motor-operated valves 24 a and 24 b and enters the heat source heat exchanger 23. For example, the refrigerant that has evaporated heat from the outdoor air in the heat source heat exchanger 23 is sucked into the compressor 21 via the four-way switching valve 22 and compressed by the compressor 21. And the refrigerant | coolant compressed with the compressor 21 is supplied to the some air conditioning unit 30 from 2nd port 27a, 27b arrange | positioned in parallel with the 2nd entrance / exit part 27 via the four-way switching valve 22. FIG. . The refrigerant supplied from the second ports 27 a and 27 b enters each air-refrigerant heat exchanger 31.

  Further, during the heating cycle operation, the refrigerant condensed by applying heat to the water circulated by the circulation pump 42 in the water-refrigerant heat exchanger 41 returns from the first port 26 c arranged in parallel with the first inlet / outlet portion 26. come. The refrigerant returned from the first port 26c is expanded via the motor-operated valve 24c and enters the heat source heat exchanger 23 together with the refrigerant returned from the first ports 26a and 26b. Then, the refrigerant exiting the heat source heat exchanger 23 is sucked into the compressor 21 via the four-way switching valve 22 and compressed by the compressor 21. Then, the refrigerant compressed by the compressor 21 is supplied to the hot water supply unit 40 from the second port 27 c arranged in parallel with the second inlet / outlet portion 27. The refrigerant supplied from the second port 27 c enters the water-refrigerant heat exchanger 41.

  In the water-refrigerant heat exchanger 41, water flows through the water circulation channel 45 from the bottom 44 a of the hot water storage tank 44 toward the top 44 b by the circulation pump 42. In the water-refrigerant heat exchanger 41, the water flowing through the water circulation passage 45 is warmed by the high-temperature high-pressure refrigerant. The water warmed by the water-refrigerant heat exchanger 41 is stored from the upper part 44 b of the hot water storage tank 44. The temperature of the water stored in the hot water storage tank 44 is managed by the use side control unit 32b, and is maintained at the set temperature set by the user. When the hot water supply terminal 48 is requested to supply hot water having a set temperature, the use side control unit 32b supplies the hot water storage tank 44 through the hot water supply passage 47 to the hot water supply terminal 48. The burner 61 is off.

  However, when the amount of heat is insufficient for supplying hot water at the set temperature to the hot water supply terminal 48 using only the water-refrigerant heat exchanger 41, the use-side control unit 32b turns on the combustion burner 61 and is insufficient. Is supplemented by the combustion heater 60.

  Further, when there is no request for hot water supply (when no hot water supply is required), the motor-operated valve 24c of the first port 26c to which the hot water supply unit 40 is connected can be opened by a predetermined opening degree. . When there is no need for hot water supply and there is no need to circulate the refrigerant, the refrigerant may stay in the water-refrigerant heat exchanger 41 and the compressor 21 may fail. Therefore, for example, the use side control unit 32b may be configured to send a command to the heat source side control unit 28 to open the electric valve 24c by a predetermined opening when there is no request for hot water supply.

(3) Modification (3-1) Modification 1A
In the above embodiment, the case where the combustion heater 60 is built in the hot water supply unit 40 has been described. However, as shown in FIG. 5, the combustion heater 60 may be connected to the hot water supply unit 40. .

(3-2) Modification 1B
In the above embodiment and Modification 1A, as an example of heating hot water supplied from the water supply pipe 46 to the hot water supply terminal 48 via the hot water supply unit 40, the hot water storage tank 44 or downstream of the hot water supply unit 40 passes through the hot water supply unit 40. The case where the water to be supplied is heated by the combustion heater 60 has been described. However, the location for heating the hot water supplied via the hot water supply unit 40 is not limited to the downstream of the hot water storage tank 44. For example, the place for heating the hot water supplied via the hot water supply unit 40 may be between the water-refrigerant heat exchanger 41 and the hot water storage tank 44 as shown in FIG. In that case, the combustion heater 60 is inserted into the water circulation passage 45. 6 shows an example in which the combustion heater 60 is connected to the hot water supply unit 40. However, the combustion heater 60 is built in the hot water supply unit 40 and inserted into the water circulation passage 45, and the water heater -It can also comprise so that the water supplied with the hot water via the hot water supply unit 40 may be heated with the combustion heater 60 between the refrigerant | coolant heat exchanger 41 and the hot water storage tank 44. FIG.

(3-3) Modification 1C
In the modified example 1B described above, the case where the place where the hot water supplied via the hot water supply unit 40 is heated is between the water-refrigerant heat exchanger 41 and the hot water storage tank 44 is shown in FIG. It can also be configured as follows. In other words, the water heated directly from the hot water storage tank 44 and heated by the combustion heater 60 may be configured so that the water heated by the combustion heater 60 is directly returned to the hot water storage tank 44. FIG. 7 shows an example in which a combustion heater 60 is built in the hot water supply unit 40, but the combustion heater 60 is connected to the hot water supply unit 40 and is connected to the hot water storage tank 44 of the hot water supply unit 40. It is also possible to take out the water directly and heat it with the combustion heater 60, and then return the water heated with the combustion heater 60 directly to the hot water storage tank 44 of the hot water supply unit 40.

(3-4) Modification 1D
In the above embodiment, the case where one liquid side closing valve 19 and one gas side closing valve 18 are provided has been described. However, as shown in FIG. 8, the first ports 26 a and 26 b of the first inlet / outlet portion 26. , 26c, 26d, and 26e may be provided with liquid side closing valves 19a, 19b, 19c, 19d, and 19e, respectively. Moreover, you may provide gas side closing valve 18a, 18b, 18c, 18d, 18e so that it may respond | correspond to 2nd port 27a, 27b, 27c, 27d, 27e of the 2nd entrance / exit part 27, respectively. In addition, as described with reference to FIG. 8, the hot water supply air conditioning systems 10 of the modifications 1A to 1C are provided with five liquid-side shut-off valves corresponding to the five first ports 26a to 26e. It is also possible to change to provide five gas side shut-off valves corresponding to the ports 27a to 27e.

(3-4) Modification 1E
In the above embodiment, the case where water supplied through the hot water supply unit 40 is directly heated by the combustion burner 61 of the combustion heater 60 to increase the temperature of the water has been described. However, the combustion burner of the combustion heater 60 is described. The hot water boiled at 61 may be mixed with the water to be supplied via the hot water supply unit 40 so that the temperature of the hot water supplied via the hot water supply unit 40 is increased. For example, a mixing valve is provided in the hot water supply air-conditioning system 10 so that hot water boiled by the combustion burner 61 of the combustion heater 60 can be mixed by the mixing valve with water supplied through the hot water supply unit 40. Such a configuration can be obtained.

(4) Features (4-1)
In the hot water supply air-conditioning system 10 of the embodiment and the modifications 1A to 1E, when the four-way switching valve 22 (example of the cycle switching mechanism) is switched to perform the heating cycle operation, the second port of the second inlet / outlet portion 27 is used. High-temperature high-pressure refrigerant is supplied from 27a, 27b, and 27c to the air conditioning unit 30 and the hot water supply unit 40, and the high-pressure refrigerant cooled from the air conditioning unit 30 and the hot water supply unit 40 is supplied to the first ports 26a, 26b, and 26c of the first inlet / outlet portion 26. Can be returned. At this time, the heating / cooling unit 30 can perform heating, and the hot water supply unit 40 exchanges heat between the high-temperature high-pressure refrigerant supplied from the first port 26c by the water-refrigerant heat exchanger 41 and water. The water warmed using the water-refrigerant heat exchanger 41 can be stored in the hot water storage tank 44 by the circulation pump 42.

  When switching to the cooling cycle operation by the four-way switching valve 22, low-temperature low-pressure refrigerant is supplied from the first ports 26a, 26b of the first inlet / outlet portion 26 to the air-conditioning unit 30, and the low-pressure refrigerant warmed from the air-conditioning unit 30 is second It will return to the 2nd ports 27a and 27b of the entrance / exit part 27. FIG. Therefore, in the cooling cycle operation, the water cannot be warmed using the water-refrigerant heat exchanger 41 of the hot water supply unit 40. However, in the cooling cycle operation, the hot water supply unit 40 can supply hot water using hot water heated to the set temperature by the combustion burner 61 of the combustion heater 60. Thus, the hot water supply air-conditioning system 10 can supply hot water in both the heating cycle operation in which the air conditioning unit 30 performs heating and the cooling cycle operation in which cooling is performed, and the heat source unit having the above-described configuration. Even if 20 is used, hot water can be always supplied.

(4-2)
If the air conditioning unit 30 is connected to, for example, the first port 26d and the second port 27d, the refrigeration cycle with the refrigerant circulating through the air conditioning unit 30, the compressor 21, and the heat source heat exchanger 23 using the electric valve 24d of the first port 26d. Can be used for air conditioning. As in the first embodiment, when there are three or more ports such as the first ports 26a to 26e and the second ports 27a to 27d, the number of the air conditioning unit 30 and the hot water supply unit 40 can be arbitrarily changed. . In the above embodiment, only one hot water supply unit 40 is connected, but a plurality of hot water supply units 40 may be connected. Thus, if the number of the cooling / heating units 30 and hot water supply units 40 connected to the heat source unit 20 can be arbitrarily changed, the degree of freedom in system construction of the hot water supply air conditioning system 10 increases.

(4-3)
The heat source unit 20 in the hot water supply air-conditioning system 10 of the above-described embodiment and modifications 1A to 1C closes the electric valve 24c of the first port 26c to which the hot water supply unit 40 is connected by the control unit 50 during the cooling cycle operation. It is configured to be able to. With such a configuration, the refrigerant that exits from the first inlet / outlet part 26 and returns to the second inlet / outlet part 27 during the cooling cycle operation is cold, and therefore, during the cooling cycle operation, the first port 26c to which the hot water supply unit 40 is connected. By closing the motor-operated valve 24c, it is possible to prevent cold refrigerant from being supplied to the hot water supply unit 40. As a result, it is possible to prevent loss of heat in the hot water supply unit 40 during the cooling cycle operation and prevent energy efficiency from being lowered in the hot water supply unit 40.

  In addition, the heat source unit 20 in the hot water supply air conditioning system 10 of Modification 1D closes the liquid side closing valve 19c and / or the gas side closing valve 18c of the first port 26c to which the hot water supply unit 40 is connected during the cooling cycle operation. It is configured to be able to. With such a configuration, the refrigerant that exits the first inlet / outlet portion 26 during the cooling cycle operation and returns to the second inlet / outlet portion 27 is cold, but during the cooling cycle operation, the first port 26c to which the hot water supply unit 40 is connected. And / or by closing the 2nd port 27c, it can prevent that a cold refrigerant | coolant is supplied to the hot water supply unit 40. FIG. As a result, it is possible to prevent loss of heat in the hot water supply unit 40 during the cooling cycle operation and prevent energy efficiency from being lowered in the hot water supply unit 40.

(4-4)
When the heat source unit 20 is configured to open the electric valve 24c of the first port 26c to which the hot water supply unit 40 is connected by a predetermined opening when hot water supply of the hot water supply unit 40 is unnecessary, the electric source By opening the valve 24c by a predetermined opening degree and allowing the refrigerant to flow through the hot water supply unit 40 only slightly, it is possible to prevent the refrigerant from staying in the water-refrigerant heat exchanger 41 and causing the compressor 21 to fail.

DESCRIPTION OF SYMBOLS 10 Hot water supply air-conditioning system 20 Heat source unit 21 Compressor 22 Four-way switching valve (example of cycle switching mechanism)
DESCRIPTION OF SYMBOLS 23 Heat source heat exchanger 24,24a-24e Motorized valve 26 1st inlet / outlet part 27 2nd inlet / outlet part 30 Air conditioning unit 31 Air-refrigerant heat exchanger 40 Hot water supply unit 41 Water-refrigerant heat exchanger 60 Combustion heater 61 Combustion type burner

JP 2000-55445 A

Claims (4)

A compressor (21), a cycle switching mechanism (22), a heat source heat exchanger (23), a first inlet / outlet part (26), and a second inlet / outlet part (27); Switch the flow path of the refrigerant passing through the heat source heat exchanger and supply the low-pressure refrigerant from the first inlet / outlet part and return the low-pressure refrigerant from the second inlet / outlet part, or supply the high-pressure refrigerant from the second inlet / outlet part. Whether the high-pressure refrigerant is returned from the first inlet / outlet section can be switched, a plurality of first ports (26a to 26e) are arranged in parallel with the first inlet / outlet section, and a plurality of ports are arranged in parallel with the second inlet / outlet section. A heat source unit (20) in which the second ports (27a to 27e) are disposed,
Between the first port of the first entrance / exit part and the second port of the second entrance / exit part, between the refrigerant entering and exiting the first entrance / exit part and the air and the air An air conditioning unit (30) having an air-refrigerant heat exchanger (31) for heat exchange;
Refrigerant and water connected to the other first port of the first entrance / exit part and the other second port of the second entrance / exit part, and enter / exit the first entrance / exit part and the second entrance / exit part. A hot water supply unit (40) having a water-refrigerant heat exchanger (41) for exchanging heat with
And a combustion heater (60) including a combustion burner (61) that is built in the hot water supply unit or connected to the hot water supply unit and increases the temperature of the hot water supplied through the hot water supply unit. Hot water supply air conditioning system. The heat source unit is provided with an electrically variable valve (24a to 24e) having a variable opening degree in each of the plurality of first ports of the first entrance / exit part.
The hot water supply air conditioning system according to claim 1. The heat source unit is configured to be able to close the first port and / or the second port to which the hot water supply unit is connected during a cooling cycle operation.
The hot water supply air conditioning system according to claim 2. The heat source unit can open the motor-operated valve of the first port to which the hot water supply unit is connected by a predetermined opening when the hot water supply unit is in a heating cycle operation and does not require hot water supply. Configured to,
The hot water supply air conditioning system according to claim 3.

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