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WO2016189599A1 - Dispositif de climatisation - Google Patents

Dispositif de climatisation Download PDF

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Publication number
WO2016189599A1
WO2016189599A1 PCT/JP2015/064804 JP2015064804W WO2016189599A1 WO 2016189599 A1 WO2016189599 A1 WO 2016189599A1 JP 2015064804 W JP2015064804 W JP 2015064804W WO 2016189599 A1 WO2016189599 A1 WO 2016189599A1
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WO
WIPO (PCT)
Prior art keywords
heat
heat medium
refrigerant
heat exchanger
switching device
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/JP2015/064804
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English (en)
Japanese (ja)
Inventor
裕之 森本
祐治 本村
傑 鳩村
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mitsubishi Electric Corp
Original Assignee
Mitsubishi Electric Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Mitsubishi Electric Corp filed Critical Mitsubishi Electric Corp
Priority to JP2017520077A priority Critical patent/JP6537603B2/ja
Priority to PCT/JP2015/064804 priority patent/WO2016189599A1/fr
Priority to GB1719778.1A priority patent/GB2555298B/en
Publication of WO2016189599A1 publication Critical patent/WO2016189599A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F5/00—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater

Definitions

  • the present invention relates to an air conditioner applied to, for example, a building multi air conditioner.
  • an air conditioner such as a multi air conditioner for buildings
  • a refrigerant is circulated between an outdoor unit that is a heat source unit arranged outside a building and an indoor unit arranged inside a building.
  • the refrigerant coolant thermally radiated and absorbed heat, and air-conditioning object space was cooled or heated with the air heated and cooled.
  • a plurality of indoor units are connected, and the stopped indoor units and the operating indoor units are often mixed.
  • the pipe connecting the outdoor unit and the indoor unit may be up to 100 m. The longer the pipe, the more refrigerant will be filled into the system.
  • Such an indoor unit of a multi-air conditioner for buildings is usually arranged and used in an indoor space where people are present (for example, an office space, a living room, a store, etc.). If for some reason the refrigerant leaks from the indoor unit placed in the indoor space, R32 and HFO1234yf, which are low GWP refrigerants, are flammable and toxic, which is significant from the viewpoint of impact on the human body and safety It becomes a problem.
  • Patent Document 1 since the primary loop performs cooling and heating using a change in the latent heat of the refrigerant, the amount of the transport refrigerant can be reduced. However, since the secondary loop performs cooling and heating using the sensible heat change of the heat medium, it is necessary to increase the amount of the transport refrigerant. Therefore, there is a problem in that the conveyance capability required for the conveyance unit that conveys the heat medium is increased, the conveyance unit is enlarged, and the degree of freedom in arrangement is reduced.
  • the present invention has been made in order to solve the above-described problems, and can reduce the conveyance power, increase the degree of freedom of system installation, and improve the reliability of the air conditioning.
  • a device is provided.
  • the air conditioner according to the present invention includes a compressor, a heat source side heat exchanger, a throttling device, and a heat source side refrigerant circulation in which refrigerant flow paths of a plurality of heat exchangers between heat media are connected by piping.
  • the circuit is provided corresponding to each of the plurality of usage-side heat exchangers, and each of the plurality of usage-side heat exchangers is connected to one of the plurality of heat exchangers between the heating media to provide a flow path for the heating medium.
  • a heat medium flow switching device for switching and the heat medium is an incombustible refrigerant that performs heat exchange with latent heat in each of the heat exchangers between heat medium and the use side heat exchanger, and the plurality of pumps are heat in liquid state.
  • This is a liquid pump that sucks the medium and circulates it in the heat medium circuit. It is.
  • an air conditioner that can reduce the conveyance power, increase the degree of freedom of installation of the system, and improve the reliability.
  • FIG. 5 is a Ph diagram of each of the refrigerant circulation circuit A and the heat medium circulation circuit B when the air-conditioning apparatus according to the embodiment of the present invention is in the cooling only operation mode. It is a refrigerant circuit diagram which shows the flow of the refrigerant
  • FIG. 3 is a Ph diagram of each of the refrigerant circulation circuit A and the heat medium circulation circuit B when the air-conditioning apparatus according to the embodiment of the present invention is in the heating only operation mode. It is a refrigerant circuit diagram which shows the flow of the refrigerant
  • FIG. 4 is a Ph diagram of each of the refrigerant circulation circuit A and the heat medium circulation circuit B when the air-conditioning apparatus according to the embodiment of the present invention is in the cooling main operation mode. It is a refrigerant circuit diagram which shows the flow of the refrigerant
  • FIG. 4 is a Ph diagram of each of the refrigerant circulation circuit A and the heat medium circulation circuit B when the air-conditioning apparatus according to the embodiment of the present invention is in the heating main operation mode.
  • FIG. 1 is a schematic diagram illustrating an installation example of an air conditioner according to an embodiment of the present invention. Based on FIG. 1, the installation example of an air conditioning apparatus is demonstrated.
  • This air conditioner uses a refrigeration cycle (refrigerant circulation circuit A, heat medium circulation circuit B) that circulates refrigerant (heat source side refrigerant, heat medium) so that each indoor unit can be in the cooling mode or the heating mode as an operation mode. It can be freely selected.
  • refrigerant circulation circuit A, heat medium circulation circuit B that circulates refrigerant (heat source side refrigerant, heat medium) so that each indoor unit can be in the cooling mode or the heating mode as an operation mode. It can be freely selected.
  • the air conditioning apparatus employs a method (indirect method) in which a refrigerant (heat source side refrigerant) is indirectly used for air conditioning of the air-conditioning target space. That is, the cold or warm heat stored in the heat source side refrigerant is transmitted to a refrigerant (hereinafter referred to as a heat medium) different from the heat source side refrigerant, and the air-conditioning target space is cooled or heated with the cold heat or heat stored in the heat medium. It has become.
  • a refrigerant heat source side refrigerant
  • the air conditioner according to the present embodiment includes one outdoor unit 1 that is a heat source unit, a plurality of indoor units 2, and heat that is interposed between the outdoor unit 1 and the indoor unit 2. And a medium converter 3.
  • the heat medium relay unit 3 performs heat exchange between the heat source side refrigerant and the heat medium.
  • the outdoor unit 1 and the heat medium relay unit 3 are connected by a refrigerant pipe 4 through which the heat source side refrigerant passes.
  • the heat medium relay unit 3 and the indoor unit 2 are connected by a pipe (heat medium pipe) 5 through which the heat medium passes.
  • the cold or warm heat generated by the outdoor unit 1 is delivered to the indoor unit 2 via the heat medium converter 3.
  • the outdoor unit 1 is usually disposed in an outdoor space 6 that is a space (for example, a rooftop) outside a building 9 such as a building, and supplies cold or hot energy to the indoor unit 2 via the heat medium converter 3. It is.
  • the indoor unit 2 is arranged at a position where cooling air or heating air can be supplied to the indoor space 7 that is a space (for example, a living room) inside the building 9, and the cooling air is supplied to the indoor space 7 that is the air-conditioning target space. Alternatively, heating air is supplied.
  • the heat medium relay unit 3 is configured as a separate housing from the outdoor unit 1 and the indoor unit 2 so that it can be installed in a space different from the outdoor space 6 and the indoor space 7. Further, the heat medium converter 3 is connected to the outdoor unit 1 and the indoor unit 2 through the refrigerant pipe 4 and the pipe 5, respectively, and transmits cold heat or hot heat supplied from the outdoor unit 1 to the indoor unit 2.
  • an outdoor unit 1 and a heat medium converter 3 are connected using two refrigerant pipes 4. Further, the heat medium relay unit 3 and each indoor unit 2 are connected using two pipes 5. Thus, in the air conditioning apparatus according to the present embodiment, each unit (outdoor unit 1, indoor unit 2, and heat medium converter 3) is connected using two pipes (refrigerant pipe 4, pipe 5). Therefore, construction is easy.
  • the heat medium converter 3 is inside the building 9 but is a space other than the indoor space 7 such as a ceiling (for example, a space such as a ceiling behind the building 9, hereinafter, An example of a state where it is installed in the space 8) is shown.
  • the heat medium relay 3 can also be installed in a common space where there is an elevator or the like.
  • the indoor unit 2 is a ceiling cassette type is shown as an example, the present invention is not limited to this, and the indoor unit 2 is directly or directly in the indoor space 7 such as a ceiling embedded type or a ceiling suspended type. Any type of air can be used as long as heating air or cooling air can be blown out by a duct or the like.
  • FIG. 1 shows an example in which the outdoor unit 1 is installed in the outdoor space 6, but the present invention is not limited to this.
  • the outdoor unit 1 may be installed in an enclosed space such as a machine room with a ventilation opening.
  • the outdoor unit 1 may be installed inside the building 9 as long as the exhaust heat can be exhausted outside the building 9 by an exhaust duct, or when the water-cooled outdoor unit 1 is used. It may be installed inside the building 9. Even if the outdoor unit 1 is installed in such a place, no particular problem occurs.
  • the heat medium converter 3 can also be installed in the vicinity of the outdoor unit 1. However, it should be noted that if the distance from the heat medium relay unit 3 to the indoor unit 2 is too long, the power for transporting the heat medium becomes considerably large, and the energy saving effect is diminished. Furthermore, the number of connected outdoor units 1, indoor units 2, and heat medium converters 3 is not limited to the number shown in FIG. 1, but in building 9 where the air conditioner according to the present embodiment is installed. The number of units may be determined accordingly.
  • FIG. 2 is a schematic circuit configuration diagram showing an example of a circuit configuration of an air-conditioning apparatus (hereinafter referred to as an air-conditioning apparatus 100) according to an embodiment of the present invention. Based on FIG. 2, the detailed structure of the air conditioning apparatus 100 is demonstrated. As shown in FIG. 2, the outdoor unit 1 and the heat medium relay unit 3 are connected to the refrigerant pipe 4 via the heat exchanger related to heat medium 15 a and the heat exchanger related to heat medium 15 b provided in the heat medium converter 3. And constitutes a refrigerant circulation circuit A which is a refrigeration cycle for circulating the heat source side refrigerant.
  • a refrigerant circulation circuit A which is a refrigeration cycle for circulating the heat source side refrigerant.
  • the heat medium converter 3 and the indoor unit 2 are connected by a pipe 5 via a heat medium heat exchanger 15a and a heat medium heat exchanger 15b to constitute a heat medium circuit B that circulates the heat medium. is doing.
  • the refrigerant pipe 4 will be described in detail later.
  • the refrigerant circuit A Since the refrigerant circuit A is installed outside the basic room, R32, HFO1234yf, or the like, which is a flammable refrigerant, is used as the refrigerant.
  • R410A, CO 2, or the like, which is a non-combustible refrigerant, in the heat medium circuit B the air conditioner 100 with improved safety can be provided.
  • Outdoor unit 1 In the outdoor unit 1, a compressor 10, a first refrigerant flow switching device 11 such as a four-way valve, a heat source side heat exchanger 12, and an accumulator 19 are connected and connected in series through a refrigerant pipe 4. Yes.
  • the outdoor unit 1 is also provided with a first connection pipe 4a, a second connection pipe 4b, a check valve 13a, a check valve 13b, a check valve 13c, and a check valve 13d.
  • the outdoor unit can be used regardless of the operation required by the indoor unit 2.
  • the flow of the heat source side refrigerant flowing from the machine 1 into the heat medium relay machine 3 can be in a certain direction.
  • the compressor 10 sucks the heat source side refrigerant and compresses the heat source side refrigerant to a high temperature and high pressure state.
  • the compressor 10 may be composed of an inverter compressor capable of capacity control.
  • the first refrigerant flow switching device 11 has a flow of the heat source side refrigerant in the heating operation mode (in the heating only operation mode and the heating main operation mode) and in the cooling operation mode (in the all cooling operation mode and the cooling main operation mode). ) To switch the flow of the heat source side refrigerant.
  • the heat source side heat exchanger 12 functions as an evaporator during heating operation, functions as a radiator (gas cooler) during cooling operation, and between the air supplied from a blower such as a fan (not shown) and the heat source side refrigerant. Heat exchange is performed.
  • the accumulator 19 is provided on the suction side of the compressor 10, and surplus refrigerant due to a difference between the heating operation mode and the cooling operation mode, a change in the transient operation (for example, a change in the number of indoor units 2 operated). The excess refrigerant is stored.
  • Each indoor unit 2 is equipped with a use side heat exchanger 26 (use side heat exchanger 26a to use side heat exchanger 26d).
  • the use side heat exchanger 26 is connected to the heat medium flow control device 25 (heat medium flow control device 25a to heat medium flow control device 25d) and the second heat medium flow switching device 23 ( The second heat medium flow switching device 23a to the second heat medium flow switching device 23d) are connected.
  • the use-side heat exchanger 26 performs heat exchange between air supplied from a blower such as a fan (not shown) and a heat medium, and generates heating air or cooling air to be supplied to the indoor space 7. To do.
  • the heat medium relay unit 3 includes two heat exchangers between heat mediums 15 (heat medium heat exchanger 15a and heat medium heat exchanger 15b), and two expansion devices 16 (expansion device 16a and expansion device 16b).
  • Two opening / closing devices 17 opening / closing device 17a, opening / closing device 17b
  • two second refrigerant flow switching devices 18 second refrigerant flow switching device 18a, second refrigerant flow switching device 18b
  • the heat medium relay unit 3 further includes four refrigerant liquid pumps (hereinafter simply referred to as liquid pumps) 21 (liquid pump 21a and liquid pump 21b), liquid pump 37 (liquid pump 37a and liquid pump 37b), and four first Heat medium flow switching device 22 (first heat medium flow switching device 22a to first heat medium flow switching device 22d) and four second heat medium flow switching devices 23 (second heat medium flow switching devices) 23a to second heat medium flow switching device 23d), four heat medium flow control devices 25 (heat medium flow control device 25a to heat medium flow control device 25d), and four backflow prevention devices 38 (backflow prevention device 38a). 38b), backflow prevention device 39 (backflow prevention device 39a, backflow prevention device 39b), four bypass circuits 40 (bypass circuit 40a, bypass circuit 40b), bypass circuit 41 (bypass circuit 41a, bypass) Circuit 41b) is installed.
  • liquid pumps refrigerant liquid pumps
  • the two heat exchangers between heat mediums 15 function as a condenser (heat radiator) or an evaporator.
  • the heat exchanger related to heat medium 15 performs heat exchange between the heat source side refrigerant and the heat medium, and transmits cold heat or heat generated in the outdoor unit 1 and stored in the heat source side refrigerant to the heat medium.
  • the heat exchanger related to heat medium 15a is provided between the expansion device 16a and the second refrigerant flow switching device 18a in the refrigerant circuit A and serves to cool the heat medium in the cooling / heating mixed operation mode. is there.
  • the heat exchanger related to heat medium 15b is provided between the expansion device 16b and the second refrigerant flow switching device 18b in the refrigerant circuit A and serves to heat the heat medium in the cooling / heating mixed operation mode. is there.
  • the two expansion devices 16 have functions as pressure reducing valves and expansion valves, and expand the heat source side refrigerant by reducing the pressure.
  • the expansion device 16a is provided on the upstream side of the heat exchanger related to heat medium 15a in the flow of the heat source side refrigerant in the cooling only operation mode.
  • the expansion device 16b is provided on the upstream side of the heat exchanger related to heat medium 15b in the flow of the heat source side refrigerant in the cooling only operation mode.
  • the two expansion devices 16 may be configured by a device whose opening degree can be variably controlled, for example, an electronic expansion valve.
  • the opening / closing devices 17a and 17b are configured by two-way valves or the like, and open and close the refrigerant pipe 4.
  • the two second refrigerant flow switching devices 18 are constituted by four-way valves or the like, and switch the flow of the heat source side refrigerant according to the operation mode. Is.
  • the second refrigerant flow switching device 18a is provided on the downstream side of the heat exchanger related to heat medium 15a in the flow of the heat source side refrigerant in the cooling only operation mode.
  • the second refrigerant flow switching device 18b is provided on the downstream side of the heat exchanger related to heat medium 15b in the flow of the heat source side refrigerant in the cooling only operation mode.
  • the four liquid pumps 21a, 21b, 37a and 37b circulate the heat medium passing through the pipe 5 in the heat medium circuit B.
  • the liquid pump 21a and the liquid pump 21b are for cooling, and the liquid pump 37a and the liquid pump 37b are for heating.
  • the liquid pump 21a is provided between the heat exchanger related to heat medium 15a and the heat medium flow control device 25b.
  • the liquid pump 21b is provided between the heat exchanger related to heat medium 15b and the heat medium flow control device 25d.
  • the two liquid pumps 21 may be constituted by, for example, liquid pumps capable of capacity control.
  • the liquid pump 37a is provided upstream of the heat medium flow control device 25a in the heat medium flow in the heat medium circuit B.
  • the liquid pump 37b is provided upstream of the heat medium flow control device 25c in the flow of the heat medium in the heat medium circuit B.
  • the two liquid pumps 37 may be constituted by, for example, liquid pumps capable of capacity control.
  • the four first heat medium flow switching devices 22 are configured by three-way valves or the like, and switch the heat medium flow channels. Is.
  • the first heat medium flow switching device 22 is provided in a number (here, four) according to the number of indoor units 2 installed. In the first heat medium flow switching device 22, one of the three sides is in the heat exchanger related to heat medium 15a, one of the three sides is in the heat exchanger related to heat medium 15b, and one of the three sides is in use side heat.
  • the heat exchanger is connected to the exchanger 26 and provided on the outlet side of the heat medium flow path of the use side heat exchanger 26.
  • the first heat medium flow switching device 22a, the first heat medium flow switching device 22b, the first heat medium flow switching device 22c, and the first heat medium flow from the lower side of the drawing. This is illustrated as a switching device 22d.
  • the four second heat medium flow switching devices 23 are configured by three-way valves or the like, and switch the flow path of the heat medium. Is.
  • the number of the second heat medium flow switching devices 23 is set according to the number of installed indoor units 2 (here, four).
  • the heat exchanger is connected to the exchanger 26 and provided on the inlet side of the heat medium flow path of the use side heat exchanger 26.
  • the four heat medium flow control devices 25 are configured by an electronic expansion valve or the like that can control the opening area, and adjust the flow rate of the heat medium flowing through the pipe 5. To do.
  • the number of the heat medium flow control devices 25 is set according to the number of indoor units 2 installed (four in this case).
  • the heat medium flow control devices 25a and 25c are provided downstream of the liquid pumps 37a and 37b in the flow of the heat medium in the heat medium circuit B.
  • the heat medium flow control devices 25b and 25d are provided downstream of the liquid pumps 21a and 21b in the flow of the heat medium in the heat medium circuit B.
  • the heat medium flow adjustment device 25 a, the heat medium flow adjustment device 25 b, the heat medium flow adjustment device 25 c, and the heat medium flow adjustment device 25 d are illustrated from the lower side of the drawing.
  • the heat medium relay 3 includes various detection means (two first temperature sensors 31, four second temperature sensors 34 (34a, 34b, 34a, 34b), and four third temperature sensors 35 (35a, 35b). , 35a, 35b) and a pressure sensor 36).
  • Information for example, temperature information, pressure information, and heat source side refrigerant concentration information
  • Information is sent to a control device (not shown) that performs overall control of the operation of the air conditioner 100, and the compressor 10 Drive frequency, rotation speed of a blower (not shown) provided in the vicinity of the heat source side heat exchanger 12 and the use side heat exchanger 26, switching of the first refrigerant flow switching device 11, driving frequency of the liquid pump 21, second refrigerant This is used for control such as switching of the flow path switching device 18 and switching of the flow path of the heat medium.
  • the two first temperature sensors 31 are the heat medium flowing out from the heat exchanger related to heat medium 15, that is, the temperature of the heat medium at the outlet of the heat exchanger related to heat medium 15.
  • a thermistor may be used.
  • the first temperature sensor 31a is provided in the pipe 5 on the inlet side of the liquid pump 21a.
  • the first temperature sensor 31b is provided in the pipe 5 on the inlet side of the liquid pump 21b.
  • the four second temperature sensors 34 are provided upstream of the first heat medium flow switching device 22 and the temperature of the heat medium flowing out from the use side heat exchanger 26. It may be configured by a thermistor or the like.
  • the number of the second temperature sensors 34 (four here) according to the number of indoor units 2 installed is provided. In correspondence with the indoor unit 2, the second temperature sensor 34a, the second temperature sensor 34b, the second temperature sensor 34c, and the second temperature sensor 34d are illustrated from the lower side of the drawing.
  • the four third temperature sensors 35 are provided on the inlet side or the outlet side of the heat source side refrigerant of the heat exchanger related to heat medium 15, and the heat exchanger related to heat medium 15 The temperature of the heat source side refrigerant flowing into the heat source or the temperature of the heat source side refrigerant flowing out of the intermediate heat exchanger 15 is detected.
  • the four third temperature sensors 35 may be composed of a thermistor or the like.
  • the third temperature sensor 35a is provided between the heat exchanger related to heat medium 15a and the second refrigerant flow switching device 18a.
  • the third temperature sensor 35b is provided between the heat exchanger related to heat medium 15a and the expansion device 16a.
  • the third temperature sensor 35c is provided between the heat exchanger related to heat medium 15b and the second refrigerant flow switching device 18b.
  • the third temperature sensor 35d is provided between the heat exchanger related to heat medium 15b and the expansion device 16b.
  • the pressure sensor 36 is provided between the heat exchanger related to heat medium 15b and the expansion device 16b, and between the heat exchanger related to heat medium 15b and the expansion device 16b. The pressure of the flowing heat source side refrigerant is detected.
  • the control device (not shown) is constituted by a microcomputer or the like, and based on detection information from various detection means and instructions from the remote controller, the driving frequency of the compressor 10 and the rotational speed of the blower (including ON / OFF) , Switching of the first refrigerant flow switching device 11, driving of the liquid pump 21, opening of the expansion device 16, opening / closing of the opening / closing device 17, switching of the second refrigerant flow switching device 18, first heat medium flow switching device 22, the second heat medium flow switching device 23, the opening degree of the heat medium flow control device 25, and the like are controlled, and each operation mode described later is executed.
  • a control apparatus may be provided for every unit and may be provided in the outdoor unit 1 or the heat medium relay unit 3.
  • the pipe 5 through which the heat medium passes is composed of one connected to the heat exchanger related to heat medium 15a and one connected to the heat exchanger related to heat medium 15b.
  • the pipe 5 is branched (here, four branches each) according to the number of indoor units 2 connected to the heat medium relay unit 3.
  • the pipe 5 connected to the heat exchanger related to heat medium 15a and the pipe 5 connected to the heat exchanger related to heat medium 15b include the first heat medium flow switching device 22 and the second heat medium flow. They are connected to each other by a path switching device 23.
  • the heat medium from the heat exchanger related to heat medium 15a flows into the use-side heat exchanger 26, or the heat medium Whether the heat medium from the intermediate heat exchanger 15b flows into the use side heat exchanger 26 is determined.
  • the refrigerant circulation circuit A when reorganizing the configuration of the refrigerant circulation circuit A, the refrigerant circulation circuit A includes the compressor 10, the first refrigerant flow switching device 11, the heat source side heat exchanger 12, the switching device 17, and the second refrigerant flow switching.
  • the apparatus 18, the refrigerant flow path of the heat exchanger related to heat medium 15 a, the expansion device 16, and the accumulator 19 are connected by the refrigerant pipe 4.
  • the heat medium circulation circuit B includes a heat medium flow path of the inter-heat medium heat exchanger 15a, a liquid pump 21, a first heat medium flow switching device 22, a heat medium flow control device 25, a use side heat exchanger 26,
  • the second heat medium flow switching device 23 is connected by a pipe 5. That is, a plurality of usage-side heat exchangers 26 are connected in parallel to each of the heat exchangers between heat media 15, and the heat medium circulation circuit B has a plurality of systems.
  • the outdoor unit 1 and the heat medium relay unit 3 are connected via the heat exchanger related to heat medium 15a and the heat exchanger related to heat medium 15b provided in the heat medium converter 3.
  • the heat medium relay unit 3 and the indoor unit 2 are also connected via the heat exchanger related to heat medium 15a and the heat exchanger related to heat medium 15b. That is, in the air conditioner 100, the heat source side refrigerant circulating in the refrigerant circuit A and the heat medium circulating in the heat medium circuit B exchange heat in the intermediate heat exchanger 15a and the intermediate heat exchanger 15b. It is like that.
  • a non-combustible refrigerant such as R410A, CO 2 or the like is used as the refrigerant used in the heat medium circulation circuit B, and this non-combustible refrigerant is characterized by changing latent heat. Safety can be secured by using such a non-combustible refrigerant.
  • the heat exchanger 15 and the use side heat exchanger 26 perform heat exchange by changing the latent heat. As compared with the case of using a heat medium for performing heat transfer, heat can be transferred efficiently, and the amount of the heat transfer medium can be reduced. For this reason, it is possible to reduce the size of the liquid pump as the heat medium conveying means.
  • the air conditioner 100 can perform a cooling operation or a heating operation in the indoor unit 2 based on an instruction from each indoor unit 2. That is, the air conditioning apparatus 100 can perform the same operation for all the indoor units 2 and can perform different operations for each of the indoor units 2.
  • the operation mode executed by the air conditioner 100 includes a cooling only operation mode in which all the driven indoor units 2 execute a cooling operation, and a heating only operation in which all the driven indoor units 2 execute a heating operation.
  • each operation mode is demonstrated with the flow of a heat-source side refrigerant
  • FIG. 3 is a refrigerant circuit diagram illustrating a refrigerant flow when the air-conditioning apparatus according to the embodiment of the present invention is in the cooling only operation mode.
  • the cooling only operation mode will be described by taking as an example a case where a cooling load is generated only in the use side heat exchanger 26a and the use side heat exchanger 26b.
  • the piping represented with the thick line has shown the piping through which a refrigerant
  • coolant a heat source side refrigerant
  • the flow direction of the heat source side refrigerant is indicated by a solid line arrow, and the flow direction of the heat medium is indicated by a broken line arrow.
  • the first refrigerant flow switching device 11 is switched so that the heat source side refrigerant discharged from the compressor 10 flows into the heat source side heat exchanger 12.
  • the heat medium flow control device 25b and the heat medium flow control device 25d are opened, and the heat medium flow control device 25a and the heat medium flow control device 25c are fully closed.
  • the liquid pump 21a for cooling and the liquid pump 21b for cooling are driven, and between the heat exchanger 15a and the utilization side heat exchanger 26a, between the heat exchanger 15b and the utilization side heat exchange.
  • the heat medium circulates between the heater 26b.
  • FIG. 4 is a Ph diagram (relationship between refrigerant pressure and specific enthalpy) of the refrigerant circuit A and the heat medium circuit B when the air-conditioning apparatus according to the embodiment of the present invention is in the cooling only operation mode.
  • FIG. 4 is a Ph diagram (relationship between refrigerant pressure and specific enthalpy) of the refrigerant circuit A and the heat medium circuit B when the air-conditioning apparatus according to the embodiment of the present invention is in the cooling only operation mode.
  • the high-pressure refrigerant that has flowed out of the heat source side heat exchanger 12 flows out of the outdoor unit 1 through the check valve 13a, and flows into the heat medium relay unit 3 through the refrigerant pipe 4.
  • the high-pressure refrigerant that has flowed into the heat medium relay unit 3 is branched after passing through the opening / closing device 17a and flows into the expansion device 16a and the expansion device 16b.
  • the refrigerant that has flowed into the expansion device 16a and the expansion device 16b is expanded into a low-temperature and low-pressure two-phase refrigerant (state (3)).
  • the opening / closing device 17b is closed.
  • This two-phase refrigerant flows into each of the intermediate heat exchanger 15a and the intermediate heat exchanger 15b acting as an evaporator, and absorbs heat from the heat medium circulating in the heat medium circuit B. By doing so, it becomes a low-temperature and low-pressure gas refrigerant (state (4)) while cooling the heat medium.
  • the gas refrigerant that has flowed out of the heat exchanger related to heat medium 15a and the heat exchanger related to heat medium 15b passes through the second refrigerant flow switching device 18a and the second refrigerant flow switching device 18b, and then merges to convert the heat medium. It flows out of machine 3.
  • the refrigerant that has flowed out of the heat medium relay unit 3 flows into the outdoor unit 1 again through the refrigerant pipe 4.
  • the refrigerant flowing into the outdoor unit 1 passes through the check valve 13d and is sucked into the compressor 10 again via the first refrigerant flow switching device 11 and the accumulator 19.
  • the second refrigerant flow switching device 18a and the second refrigerant flow switching device 18b communicate with the low pressure pipe. Further, the opening degree of the expansion device 16a is controlled so that the superheat (superheat degree) obtained as a difference between the temperature detected by the third temperature sensor 35a and the temperature detected by the third temperature sensor 35b becomes constant. Is done. Similarly, the opening degree of the expansion device 16b is controlled so that the superheat obtained as the difference between the temperature detected by the third temperature sensor 35c and the temperature detected by the third temperature sensor 35d is constant.
  • Heat medium circulation circuit B Next, the flow of the heat medium in the heat medium circuit B will be described.
  • the cold heat of the heat source side refrigerant is transmitted to the heat medium in both the heat exchanger related to heat medium 15a and the heat exchanger related to heat medium 15b, and the heat medium is cooled.
  • the liquid heat medium (state a in FIG. 4) sucked by the cooling liquid pump 21a and the liquid pump 21b is pressurized to become the state b in FIG. 4, and the heat medium flow control device 25c and the heat medium flow control The pressure is reduced by the device 25d (state c in FIG. 4).
  • the decompressed heat medium passes through the inside of the pipe 5, is sent to the use side heat exchanger 26a and the use side heat exchanger 26b, exchanges heat with ambient air (cooling), and is in a gas state (state d in FIG. 4). It becomes.
  • the heat medium in the gas state becomes the state e in FIG. 4 due to pressure loss of the pipe 5 and the first heat medium flow switching devices 22a and 22b.
  • the heat medium in this state e passes through the backflow prevention devices 39a and 39b of the bypass circuits 40a and 40b, flows into the heat exchangers 15a and 15b, and exchanges heat with the refrigerant in the refrigerant circuit A to condense.
  • the liquid state (state a in FIG. 4) is obtained.
  • the heat medium which flowed out from the heat exchangers 15a and 15b between heat media is pressurized by the liquid pump 21a and the liquid pump 21b.
  • the heating liquid pumps 37a and 37b are in a stopped state. By such an operation, the indoor space 7 is cooled.
  • the air conditioning load required in the indoor space 7 includes the temperature detected by the first temperature sensor 31a, the temperature detected by the first temperature sensor 31b, and the temperature detected by the second temperature sensor 34. (That is, the temperature difference of the heat medium at the inlet / outlet of the heat exchanger 15 between heat mediums) can be covered by controlling the opening degree of the heat medium flow control device 25 so as to keep the target value.
  • the outlet temperature of the heat exchanger related to heat medium 15 either the temperature of the first temperature sensor 31a or the first temperature sensor 31b may be used, or the average temperature thereof may be used.
  • the first heat medium flow switching device 22 and the second heat medium flow switching device 23 are configured so that each of the use side heat exchangers 26 having a heat load is between the heat medium heat exchanger 15a or the heat medium. It is switched so that the flow path is secured by being connected to the heat exchanger 15b.
  • the first heat medium flow switching device 22 and the second heat medium flow switching device 23 are configured so that each of the use side heat exchangers 26 having a heat load is heated between the heat medium heat exchanger 15a and the heat between the heat media.
  • the opening may be intermediate so that the flow path is secured by being connected to both of the exchangers 15b. This also applies to the heating only operation described later.
  • the first heat medium flow switching device 22 and the second heat medium flow The flow path is closed by the path switching device 23 so that the heat medium does not flow to the use side heat exchanger 26.
  • a heat medium flows because there is a heat load in the use side heat exchanger 26a and the use side heat exchanger 26b.
  • the heat load is supplied.
  • the corresponding first heat medium flow switching devices 22a, 22b and second heat medium flow switching devices 23a, 23b are fully closed.
  • the first heat medium flow switching devices 22c and 22d and the second heat medium flow switching devices 23c and 23d are used. Is opened and the heat medium is circulated.
  • liquid pump 21a and the liquid pump 21b are conveying means capable of changing the flow rate, and the flow rate is changed based on the temperature information from the second temperature sensor 34 at the use side outlet so that the optimum cooling output is obtained. I have control.
  • FIG. 5 is a refrigerant circuit diagram illustrating a refrigerant flow when the air-conditioning apparatus according to the embodiment of the present invention is in the heating only operation mode.
  • the heating only operation mode will be described by taking as an example a case where a thermal load is generated only in the use side heat exchanger 26a and the use side heat exchanger 26b.
  • the pipes indicated by the thick lines indicate the pipes through which the refrigerant (heat source side refrigerant and heat medium) flows.
  • the flow direction of the heat source side refrigerant is indicated by solid line arrows
  • the flow direction of the heat medium is indicated by broken line arrows.
  • the first refrigerant flow switching device 11 uses the heat source side refrigerant discharged from the compressor 10 without passing through the heat source side heat exchanger 12. It switches so that it may flow into converter 3.
  • the heat medium flow control device 25b and the heat medium flow control device 25d are opened, and the heat medium flow control device 25a and the heat medium flow control device 25c are fully closed.
  • the liquid pump 37a for heating and the liquid pump 37b for heating are driven, and between the heat exchanger 15a and the utilization side heat exchanger 26a, between the heat exchanger 15b and the utilization side heat exchange.
  • the heat medium circulates between the heater 26b.
  • FIG. 6 is a Ph diagram (relationship between refrigerant pressure and specific enthalpy) of each of the refrigerant circuit A and the heat medium circuit B in the heating only operation mode of the air-conditioning apparatus according to the embodiment of the present invention.
  • FIG. 6 is a Ph diagram (relationship between refrigerant pressure and specific enthalpy) of each of the refrigerant circuit A and the heat medium circuit B in the heating only operation mode of the air-conditioning apparatus according to the embodiment of the present invention.
  • the low-temperature and low-pressure refrigerant is compressed by the compressor 10 and discharged as a high-temperature and high-pressure gas refrigerant (state (1) in FIG. 6).
  • the high-temperature and high-pressure gas refrigerant discharged from the compressor 10 flows out of the outdoor unit 1 through the first refrigerant flow switching device 11 and the check valve 13b.
  • the high-temperature and high-pressure gas refrigerant that has flowed out of the outdoor unit 1 flows into the heat medium relay unit 3 through the refrigerant pipe 4.
  • the high-temperature and high-pressure gas refrigerant flowing into the heat medium relay unit 3 is branched and passes through the second refrigerant flow switching device 18a and the second refrigerant flow switching device 18b, and the heat exchanger related to heat medium 15a and the heat medium. It flows into each of the intermediate heat exchangers 15b.
  • the high-temperature and high-pressure gas refrigerant that has flowed into the heat exchanger related to heat medium 15a and the heat exchanger related to heat medium 15b dissipates heat to the heat medium circulating in the heat medium circuit B (the state shown in FIG. 2)).
  • the liquid refrigerant flowing out from the heat exchanger related to heat medium 15a and the heat exchanger related to heat medium 15b is expanded by the expansion device 16a and the expansion device 16b to become a low-temperature and low-pressure two-phase refrigerant (state in FIG. 6). 3)).
  • the two-phase refrigerant merges, then flows out from the heat medium relay unit 3 through the opening / closing device 17b, and flows into the outdoor unit 1 through the refrigerant pipe 4 again.
  • the opening / closing device 17a is closed.
  • the refrigerant that has flowed into the outdoor unit 1 passes through the check valve 13c and flows into the heat source side heat exchanger 12 that functions as an evaporator. And the refrigerant
  • the second refrigerant flow switching device 18a and the second refrigerant flow switching device 18b communicate with the high-pressure pipe.
  • the expansion device 16a has a constant subcool (degree of subcooling) obtained as a difference between a value obtained by converting the pressure detected by the pressure sensor 36 into a saturation temperature and a temperature detected by the third temperature sensor 35b. The opening degree is controlled.
  • the expansion device 16b has an opening degree so that a subcool obtained as a difference between a value obtained by converting the pressure detected by the pressure sensor 36 into a saturation temperature and a temperature detected by the third temperature sensor 35d is constant. Be controlled.
  • the temperature at the intermediate position of the heat exchanger related to heat medium 15 can be measured, the temperature at the intermediate position may be used instead of the pressure sensor 36, and the system can be configured at low cost.
  • Heat medium circulation circuit B Next, the flow of the heat medium in the heat medium circuit B will be described.
  • the heat of the heat source side refrigerant is transmitted to the heat medium and heated by both the heat exchanger related to heat medium 15a and the heat exchanger related to heat medium 15b.
  • the refrigerant in the liquid state in which the heat medium is sucked by the liquid pump 37a and the liquid pump 37b for heating is pressurized to become the state b in FIG. 6, and the heat medium flow control device 25a and the heat medium
  • the pressure is reduced by the flow rate adjusting device 25c (state c in FIG. 6).
  • the depressurized heat medium flows into the heat exchanger related to heat medium 15a and the heat exchanger related to heat medium 15b and exchanges heat with the refrigerant in the refrigerant circuit A to be in a gas state (state d in FIG. 6).
  • the heat medium in the gas state passes through the backflow prevention devices 38a and 39b of the bypass circuits 41a and 41b, further passes through the second heat medium flow switching devices 23a and 23b, passes through the inside of the pipe 5, and uses side heat exchange. Flows into the vessels 26a, 26b.
  • the heat medium that has flowed into the use-side heat exchangers 26a and 26b exchanges heat with the surrounding air and enters a liquid state.
  • the heat medium in the liquid state passes through the first heat medium flow switching devices 22a and 22b, and is again sucked and pressurized by the liquid pump 37a and the liquid pump 37b.
  • the cooling liquid pumps 21a and 21b are in a stopped state. By such an operation, the indoor space 7 is heated.
  • FIG. 7 is a refrigerant circuit diagram illustrating a refrigerant flow when the air-conditioning apparatus according to the embodiment of the present invention is in the cooling main operation mode.
  • the cooling main operation mode will be described by taking as an example a case where a cooling load is generated in the use side heat exchanger 26a and a heating load is generated in the use side heat exchanger 26b.
  • a pipe represented by a thick line shows a pipe through which the refrigerant (heat source side refrigerant and heat medium) circulates.
  • the flow direction of the heat source side refrigerant is indicated by solid line arrows
  • the flow direction of the heat medium is indicated by broken line arrows.
  • the first refrigerant flow switching device 11 is switched so that the heat source side refrigerant discharged from the compressor 10 flows into the heat source side heat exchanger 12.
  • the heat medium flow control device 25b and the heat medium flow control device 25c are opened, and the heat medium flow control device 25a and the heat medium flow control device 25d are fully closed.
  • the liquid pump 21a for cooling and the liquid pump 37b for heating are driven, and between the heat exchanger 15a and the utilization side heat exchanger 26a, between the heat exchanger 15b and the utilization side heat exchange.
  • the heat medium circulates between the heater 26b.
  • FIG. 8 is a Ph diagram (relationship between refrigerant pressure and specific enthalpy) of the refrigerant circuit A and the heat medium circuit B in the cooling main operation mode of the air-conditioning apparatus according to the embodiment of the present invention.
  • FIG. 8 is a Ph diagram (relationship between refrigerant pressure and specific enthalpy) of the refrigerant circuit A and the heat medium circuit B in the cooling main operation mode of the air-conditioning apparatus according to the embodiment of the present invention.
  • the low-temperature and low-pressure refrigerant is compressed by the compressor 10 and discharged as a high-temperature and high-pressure gas refrigerant (state (1) in FIG. 8).
  • the high-temperature and high-pressure gas refrigerant discharged from the compressor 10 flows into the heat source side heat exchanger 12 via the first refrigerant flow switching device 11.
  • the refrigerant flowing into the heat source side heat exchanger 12 becomes a liquid refrigerant while radiating heat to the outdoor air in the heat source side heat exchanger 12.
  • the refrigerant that has flowed out of the heat source side heat exchanger 12 flows out of the outdoor unit 1 and flows into the heat medium relay unit 3 through the check valve 13 a and the refrigerant pipe 4.
  • the refrigerant that has flowed into the heat medium relay unit 3 flows into the heat exchanger related to heat medium 15b that acts as a condenser through the second refrigerant flow switching device 18b.
  • the refrigerant flowing into the heat exchanger related to heat medium 15b becomes a refrigerant whose temperature is further lowered while dissipating heat to the heat medium circulating in the heat medium circuit B (state (2) in FIG. 8).
  • the refrigerant flowing out of the heat exchanger related to heat medium 15b is expanded by the expansion device 16b and becomes a low-pressure two-phase refrigerant (state (3) in FIG. 8). This low-pressure two-phase refrigerant flows into the heat exchanger related to heat medium 15a acting as an evaporator via the expansion device 16a that is fully open.
  • the low-pressure two-phase refrigerant that has flowed into the heat exchanger related to heat medium 15a absorbs heat from the heat medium circulating in the heat medium circuit B and becomes a low-pressure gas refrigerant while cooling the heat medium (the state of FIG. 8). (4)).
  • the gas refrigerant flows out of the heat exchanger related to heat medium 15a, flows out of the heat medium converter 3 via the second refrigerant flow switching device 18a, and flows into the outdoor unit 1 again through the refrigerant pipe 4.
  • the refrigerant that has flowed into the outdoor unit 1 is again sucked into the compressor 10 via the check valve 13d, the first refrigerant flow switching device 11, and the accumulator 19.
  • the second refrigerant flow switching device 18a communicates with the low pressure pipe, while the second refrigerant flow switching device 18b communicates with the high pressure side piping.
  • the opening degree of the expansion device 16b is controlled so that the superheat obtained as the difference between the temperature detected by the third temperature sensor 35a and the temperature detected by the third temperature sensor 35b becomes constant.
  • the opening / closing device 17b is closed.
  • the expansion device 16b controls the opening degree so that a subcool obtained as a difference between a value obtained by converting the pressure detected by the pressure sensor 36 into a saturation temperature and a temperature detected by the third temperature sensor 35d is constant. May be. Further, here, the expansion device 16b may be fully opened, and the superheat or subcool may be controlled by the expansion device 16a.
  • Heat medium circulation circuit B Next, the flow of the heat medium in the heat medium circuit B in the cooling main operation mode will be described.
  • the heating side will be described.
  • the liquid heat medium sucked by the heating liquid pump 37b (state a1 in FIG. 8) is pressurized to become the state b1 in FIG. 8, and is depressurized by the heat medium flow control device 25c (in FIG. 8).
  • State c1 The heat medium in the state c1 flows into the intermediate heat exchanger 15b, exchanges heat with the refrigerant in the refrigerant circuit A, and enters a gas state (state d1 in FIG. 8).
  • the gaseous heat medium passes through the backflow prevention device 38b of the bypass circuit 41b, and further passes through the second heat medium flow switching device 23b and the pipe 5.
  • the heat medium in the gas state becomes the state e1 in FIG. 8 due to the pressure loss of the second heat medium flow switching device 23b and the pipe 5.
  • the heat medium in this state e1 flows into the use side heat exchanger 26b.
  • the heat medium that has flowed into the use-side heat exchanger 26b exchanges heat therewith with ambient air and enters a liquid state (state a1 in FIG. 8).
  • the heat medium in the liquid state passes through the first heat medium flow switching device 22b and is again sucked into the liquid pump 37b for cooling.
  • the cooling liquid pump 21b and the heating liquid pump 37a are in a stopped state.
  • the indoor space 7 is heated by condensing the heat medium.
  • the liquid heat medium sucked by the cooling liquid pump 21a (state a in FIG. 8) is pressurized to be in state b in FIG. 8, and is depressurized by the heat medium flow control device 25b (in FIG. 8).
  • the heat medium in the state c passes through the second heat medium flow switching device 23a and the pipe 5, and is sent to the use side heat exchanger 26b.
  • the heat medium sent to the use-side heat exchanger 26b exchanges heat with ambient air (cooling), and enters a gas state (state d in FIG. 8).
  • the heat medium in the gas state becomes the state e in FIG. 8 due to the pressure loss of the pipe 5 and the first heat medium flow switching device 22a.
  • the heat medium in the state e passes through the backflow prevention device 39a of the bypass circuit 40a and flows into the heat exchanger related to heat medium 15a.
  • the heat medium that has flowed into the heat exchanger related to heat medium 15a exchanges heat with the refrigerant in the refrigerant circuit A to condense, and enters a liquid state (state a in FIG. 8).
  • the liquid heat medium is pressurized again by the cooling liquid pump 21a.
  • the heating liquid pump 37a and the cooling liquid pump 21b are in a stopped state.
  • the heat medium cools the indoor space 7 by evaporating the refrigerant into the indoor air.
  • FIG. 9 is a refrigerant circuit diagram showing a refrigerant flow when the air-conditioning apparatus according to the embodiment of the present invention is in the heating main operation mode.
  • the heating main operation mode will be described by taking as an example a case where a thermal load is generated in the use side heat exchanger 26a and a cold load is generated in the use side heat exchanger 26b.
  • a pipe represented by a thick line shows a pipe through which the refrigerant (heat source side refrigerant and heat medium) circulates.
  • the flow direction of the heat source side refrigerant is indicated by solid line arrows
  • the flow direction of the heat medium is indicated by broken line arrows.
  • the first refrigerant flow switching device 11 uses the heat source side refrigerant discharged from the compressor 10 without passing through the heat source side heat exchanger 12. It switches so that it may flow into converter 3.
  • the heat medium flow control device 25b and the heat medium flow control device 25c are opened, and the heat medium flow control device 25a and the heat medium flow control device 25d are fully closed.
  • the liquid pump 21a for cooling and the liquid pump 37b for heating are driven, and between the heat exchanger 15a and the utilization side heat exchanger 26a, between the heat exchanger 15b and the utilization side heat exchange.
  • the heat medium circulates between the heater 26b.
  • FIG. 10 is a Ph diagram (relationship between refrigerant pressure and specific enthalpy) of each of the refrigerant circuit A and the heat medium circuit B when the air-conditioning apparatus according to the embodiment of the present invention is in the heating main operation mode.
  • FIG. 10 is a Ph diagram (relationship between refrigerant pressure and specific enthalpy) of each of the refrigerant circuit A and the heat medium circuit B when the air-conditioning apparatus according to the embodiment of the present invention is in the heating main operation mode.
  • the low-temperature and low-pressure refrigerant is compressed by the compressor 10 and discharged as a high-temperature and high-pressure gas refrigerant (state (1) in FIG. 10).
  • the high-temperature and high-pressure gas refrigerant discharged from the compressor 10 flows out of the outdoor unit 1 through the first refrigerant flow switching device 11 and the check valve 13b.
  • the high-temperature and high-pressure gas refrigerant that has flowed out of the outdoor unit 1 flows into the heat medium relay unit 3 through the refrigerant pipe 4.
  • the high-temperature and high-pressure gas refrigerant that has flowed into the heat medium relay unit 3 flows into the heat exchanger related to heat medium 15b that acts as a condenser through the second refrigerant flow switching device 18b.
  • the gas refrigerant flowing into the heat exchanger related to heat medium 15b becomes liquid refrigerant while dissipating heat to the heat medium circulating in the heat medium circuit B (state (2) in FIG. 10).
  • the refrigerant flowing out of the heat exchanger related to heat medium 15b is expanded by the expansion device 16b and becomes a low-pressure two-phase refrigerant (state (3) in FIG. 10).
  • This low-pressure two-phase refrigerant flows into the heat exchanger related to heat medium 15a acting as an evaporator via the expansion device 16a that is fully open.
  • the low-pressure two-phase refrigerant flowing into the heat exchanger related to heat medium 15a evaporates by absorbing heat from the heat medium circulating in the heat medium circuit B, and becomes a low-pressure two-phase refrigerant while cooling the heat medium.
  • the low-pressure two-phase refrigerant flows out of the heat exchanger related to heat medium 15a, flows out of the heat medium converter 3 through the second refrigerant flow switching device 18a, and flows into the outdoor unit 1 again.
  • the refrigerant that has flowed into the outdoor unit 1 passes through the check valve 13c and flows into the heat source side heat exchanger 12 that functions as an evaporator. And the refrigerant
  • the second refrigerant flow switching device 18a communicates with the low-pressure side piping, while the second refrigerant flow switching device 18b communicates with the high-pressure side piping. Further, the opening of the expansion device 16b is controlled so that a subcool obtained as a difference between a value obtained by converting the pressure detected by the pressure sensor 36 into a saturation temperature and a temperature detected by the third temperature sensor 35b is constant. Is done. The opening / closing device 17a is closed. Note that the expansion device 16b may be fully opened, and the subcooling may be controlled by the expansion device 16a.
  • Heat medium circulation circuit B Next, the flow of the heat medium in the heat medium circuit B in the heating main operation mode will be described.
  • the heating side will be described.
  • the liquid heat medium sucked by the heating liquid pump 37b (state a1 in FIG. 10) is pressurized to become the state b1 in FIG. 10, and is depressurized by the heat medium flow control device 25c (in FIG. 10).
  • State c1 The refrigerant in the state c1 flows into the intermediate heat exchanger 15b, exchanges heat with the refrigerant in the refrigerant circuit A, and enters a gas state (state d1 in FIG. 10).
  • the gaseous heat medium passes through the backflow prevention device 38b of the bypass circuit 41b, and further passes through the second heat medium flow switching device 23b and the pipe 5.
  • the heat medium in the gas state becomes the state e1 in FIG. 10 due to the pressure loss of the second heat medium flow switching device 23b and the pipe 5.
  • the heat medium in this state e1 flows into the use side heat exchanger 26b.
  • the heat medium that has flowed into the use-side heat exchanger 26b exchanges heat therewith with ambient air and enters a liquid state (state a1 in FIG. 10).
  • the heat medium in the liquid state passes through the first heat medium flow switching device 22b and is again sucked into the liquid pump 37b.
  • the cooling liquid pump 21b and the heating liquid pump 37a are in a stopped state.
  • the indoor space 7 is heated by condensing the heat medium.
  • the liquid heat medium sucked by the cooling liquid pump 21a (state a in FIG. 10) is pressurized to become a liquid refrigerant (state b in FIG. 10), and is depressurized by the heat medium flow control device 25b ( State c) of FIG.
  • the heat medium in the state c passes through the second heat medium flow switching device 23a and the pipe 5, and is sent to the use side heat exchanger 26b.
  • the heat medium sent to the use-side heat exchanger 26b exchanges heat with the surrounding air (cooling) and enters a gas state (state d in FIG. 10).
  • the heat medium in the gas state becomes a state e in FIG. 10 due to pressure loss of the pipe 5 and the first heat medium flow switching device 22a.
  • the heat medium in the state e passes through the backflow prevention device 39a of the bypass circuit 40a and flows into the heat exchanger related to heat medium 15a.
  • the heat medium that has flowed into the heat exchanger related to heat medium 15a exchanges heat with the refrigerant in the refrigerant circuit A and condenses into a liquid state (state a in FIG. 10).
  • the liquid heat medium is pressurized again by the cooling liquid pump 21a.
  • the heating liquid pump 37a and the cooling liquid pump 21b are in a stopped state.
  • the heat medium cools the indoor space 7 by evaporating the refrigerant into the indoor air.
  • cooling operation By performing the above operation, cooling operation, heating operation, cooling main operation, and heating main operation can be performed.
  • a liquid pump is employed as the transfer device of the heat medium circuit B, and a refrigerant that changes heat is used as the heat medium of the heat medium circuit B.
  • Each of the intermediate heat exchanger 15 and the use side heat exchanger 26 is configured to perform heat exchange with latent heat. For this reason, heat exchange using latent heat change is possible, and the heat medium flow rate can be reduced. As a result, the conveyance power of the heat medium can be reduced. Moreover, since a non-toxic non-combustible refrigerant is used as the heat medium, safety can be ensured.
  • the heat medium circulation circuit B includes a pipe (outward pipe) 5 from the heat exchanger related to heat medium 15 toward the use side heat exchanger 26 and a pipe returning from the use side heat exchanger 26 to the heat exchanger related to heat medium 15.
  • (Return pipe) 5 and between the heat exchanger 15 between the heat medium and the second heat medium flow switching device 23 in the forward pipe 5, the liquid pump 21 and the heat medium flow control device from the upstream side 25, and a liquid pump 37 and a heat medium flow control device 25 are provided from the upstream side between the heat exchanger 15 between the heat medium 15 of the return pipe 5 and the first heat medium flow switching device 22.
  • a bypass circuit 41 that bypasses the liquid pump 21 and the heat medium flow control device 25 is connected to the outgoing pipe 5, and a bypass circuit 40 that bypasses the liquid pump 37 and the heat medium flow control device 25 is connected to the return pipe 5. ing.
  • the bypass circuits 40 and 41 are provided with backflow prevention devices 38 and 39, respectively.
  • the key point of the configuration of the heat medium circuit B described above is that, for each heat exchanger 15 between heat mediums, two liquid pumps 21 and 37 are used separately for cooling and for heating. .
  • the reason for this configuration is as follows.
  • the state of the heat medium changes to the gas state, the two-phase state, or the liquid state while circulating through the heat medium circuit B. For this reason, from the viewpoint of sucking the heat medium with the liquid pump at a position where the heat medium is in a liquid state, the liquid pump is divided for cooling and for heating.
  • one liquid pump is configured for each heat exchanger 15 between heat mediums, whereas two liquid pumps are provided for each heat exchanger 15 between heat mediums in the present embodiment. For this reason, the number of liquid pumps is simply increasing.
  • the transport capability required of the liquid pump is reduced, so even if the liquid pump has two configurations, Individual liquid pumps are small and can be used. Therefore, the installation space can be reduced as compared with the conventional configuration. As a result, it is possible to increase the degree of freedom of system installation.
  • the configuration in which two liquid pumps are used for each heat exchanger related to heat medium 15 and the liquid pumps are separately provided for heating and cooling is shown.
  • one liquid pump may be used for each heat exchanger related to heat medium 15.
  • a plurality of solenoid valves and the like may be combined so that a liquid heat medium is sucked into the liquid pump.

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Abstract

Un milieu de transfert de chaleur d'un circuit de circulation de milieu de transfert de chaleur B est un fluide frigorigène non combustible qui échange de la chaleur en tant que chaleur latente dans chacun des éléments parmi un échangeur de chaleur dans le milieu de transfert de chaleur 15 et un échangeur de chaleur côté utilisation 26, et une pluralité de pompes 21, 37 sont conçues en tant que pompes de liquide permettant d'aspirer dans le milieu de transfert de chaleur, qui est dans un état liquide, et de faire circuler le milieu de transfert de chaleur à travers le circuit de circulation de milieu de transfert de chaleur B.
PCT/JP2015/064804 2015-05-22 2015-05-22 Dispositif de climatisation Ceased WO2016189599A1 (fr)

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GB1719778.1A GB2555298B (en) 2015-05-22 2015-05-22 Air-conditioning apparatus

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WO2023007803A1 (fr) * 2021-07-30 2023-02-02 三菱電機株式会社 Dispositif de climatisation
GB2623036A (en) * 2021-02-25 2024-04-03 Mitsubishi Electric Corp Air-conditioning device

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WO2012049704A1 (fr) * 2010-10-12 2012-04-19 三菱電機株式会社 Convertisseur de substance de chauffage et appareil climatiseur comportant le convertisseur de substance de chauffage

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* Cited by examiner, † Cited by third party
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GB2623036A (en) * 2021-02-25 2024-04-03 Mitsubishi Electric Corp Air-conditioning device
WO2023007803A1 (fr) * 2021-07-30 2023-02-02 三菱電機株式会社 Dispositif de climatisation
WO2023007700A1 (fr) * 2021-07-30 2023-02-02 三菱電機株式会社 Climatiseur

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GB2555298B (en) 2020-08-19

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