Heat source unit and heat medium circulation system

Abstract

This heat source unit for supplying heat to a liquid heat medium flowing through a pipe includes: a heat medium heat exchanger for exchanging heat between the heat medium and a refrigerant; and a gas-liquid separation device having a cylindrical container and also having a gas-liquid separation part for swirling the heat medium in the container and separating gaseous refrigerant flowing into the container from the heat medium.

Description

Heat source unit and heat medium circulation system

[0001] The disclosed technology relates to a heat source unit and a heat medium circulation system, and in particular to ensuring safety against refrigerant leakage.

[0002] There is a system that uses a refrigeration cycle device to provide hot water supply or air conditioning, etc., by connecting a heat source unit and a load unit through pipes, forming a refrigerant circulation circuit that circulates a refrigerant and a heat medium circulation circuit that circulates a liquid heat medium. The system using the refrigeration cycle device supplies heat to a target load through heat exchange between a heat source-side refrigerant circulating through the refrigerant circulation circuit and a heat medium circulating through the heat medium circulation circuit. Here, a gas-liquid separator is installed in the heat medium circulation circuit, and when refrigerant leaks from the refrigerant circuit and flows into the heat medium circulation circuit, the refrigerant is separated and discharged from the heat medium circulation circuit (see, for example, Patent Document 1).

[0003] Japanese Patent Application Laid-Open No. 2022-126030

[0004] In the heat medium circulation system of Patent Document 1, if the speed of the fluid containing the heat medium flowing through the heat medium circulation circuit is slow, the gas-liquid separator can separate and discharge the refrigerant flowing as a gas, which is lighter than the heat medium liquid. However, if the speed of the fluid in the heat medium circulation circuit is fast, turbulence occurs in the liquid, making it impossible for the gas-liquid separator of Patent Document 1 to separate the gaseous refrigerant. Therefore, to separate the gas, it is necessary to limit the flow speed and operating conditions in the heat medium circulation circuit to prevent turbulence from occurring in the heat medium circulation circuit.

[0005] Therefore, in order to solve the above-mentioned problems, an object of the present invention is to provide a heat source unit and a heat medium circulation system that can more reliably separate refrigerant leaked into a heat medium circulation circuit to the outdoors.

[0006] The disclosed heat source unit supplies heat to a liquid heat medium flowing through a pipe, and includes a heat medium heat exchanger that exchanges heat between the heat medium and a refrigerant, and a gas-liquid separation device that has a cylindrical container, swirls the heat medium within the container, and has a gas-liquid separation section that separates the gaseous refrigerant flowing into the container from the heat medium.

[0007] The disclosed heat medium circulation system also forms a heat medium circuit by piping the above-mentioned heat source unit to a load unit having a load heat exchanger that exchanges heat with a load and supplies heat from the heat source unit to the heat load.

[0008] According to this disclosure, a gas-liquid separator installed in a pipe through which a heat medium flows swirls the heat medium within a container, thereby efficiently separating the gas that flows in together with the heat medium. In particular, when a refrigerant that exchanges heat with the heat medium flows in as a gas, the gas refrigerant can be efficiently separated, thereby improving safety.

[0009] FIG. 1 is a diagram showing the configuration of a hot water supply system centered on a heat medium circulation system according to embodiment 1. FIG. 2 is a diagram explaining the configuration of a gas-liquid separation device 30 according to embodiment 1. FIG. 3 is a diagram showing an example of the shape of a rectifying plate 315 according to embodiment 2. FIG. 4 is a diagram showing an example of the shape of a rectifying plate 315 according to embodiment 2.

[0010] Hereinafter, a heat source unit and a heat medium circulation system according to embodiments will be described with reference to the drawings. In the following drawings, components with the same reference numerals are identical or equivalent, and this applies throughout the following embodiments. Furthermore, the dimensional relationships between components in the drawings may differ from those in reality. Furthermore, the configurations of components shown throughout the specification are merely examples and are not limited to the configurations described in the specification. In particular, the combinations of components are not limited to the combinations in each embodiment, and components described in other embodiments may be applied to other embodiments. Furthermore, the levels of pressure and temperature are not determined in relation to absolute values, but are determined relatively in terms of the state, operation, etc. of the device.

[0011] Embodiment 1. FIG. 1 is a diagram showing the configuration of a hot water supply system centered on a heat medium circulation system according to embodiment 1. Here, as an example of a heat medium circulation system, a hot water supply system that heats water to supply hot water will be described. Here, the description will be made assuming that water serves as the heat medium. The water that serves as the heat medium also serves as a heat load that receives heat. Here, unless otherwise specified, the water that serves as the heat medium also includes hot water obtained by heating water. The hot water supply system according to embodiment 1 has a refrigerant circuit 10 and a heat medium circuit 20, which are formed by connecting a heat source unit 100 and a load unit 200 via piping 300. The hot water supply system according to embodiment 1 also has a radiator 400 and sanitary equipment 500.

[0012] The heat source unit 100 is a unit installed outdoors. The heat source unit 100 supplies heat to a load unit 200. The heat source unit 100 in the first embodiment has devices that constitute a refrigerant circuit 10 and some devices that constitute a heat medium circuit 20. The heat source unit 100 also has a heat source side control device 110 that controls the devices within the unit.

[0013] The refrigerant circuit 10 of the heat source unit 100 performs heating operation and heats water flowing through the heat medium circuit 20 by heat exchange with the refrigerant in a heat medium heat exchanger 13 (described later). The heat source unit 100 connects a compressor 11, a four-way valve 12, a heat medium heat exchanger 13, a first expansion valve 14, a receiver 15, a second expansion valve 16, and an air heat exchanger 17 with refrigerant piping to form the refrigerant circuit 10 in which the refrigerant circulates.

[0014] The compressor 11 compresses and discharges the drawn refrigerant. The compressor 11 in the first embodiment includes an inverter device or the like, and can precisely change the capacity of the compressor 11 (the amount of refrigerant delivered per unit time) by arbitrarily changing the drive frequency based on instructions from the heat source side control device 110. The four-way valve 12 serves as a flow path switching valve that switches the flow of the flow paths in the refrigerant circuit 10. For this reason, although not specifically described here, the hot water supply system can perform not only a heating operation, but also a cooling operation that cools water flowing through the heat medium circuit 20 and a defrosting operation that defrosts the refrigerant circuit 10.

[0015] The heat medium heat exchanger 13 exchanges heat between the water flowing through the heat medium circuit 20 and the refrigerant flowing through the refrigerant circuit 10. Therefore, the heat medium heat exchanger 13 is a component of the heat medium circuit 20 and also a component of the refrigerant circuit 10. The heat medium heat exchanger 13 is, for example, a plate heat exchanger. The water flowing through the heat medium circuit 20 and the refrigerant flowing through the refrigerant circuit 10 pass through flow paths that are isolated from each other. The heat medium heat exchanger 13 serves as a condenser or a radiator in the refrigerant circuit 10 and heats the water flowing through the heat medium circuit 20. Here, the heat source unit 100 is described as having the heat medium heat exchanger 13, but the heat medium heat exchanger 13 may be included in a unit independent of the heat source unit 100 and the load unit 200, for example.

[0016] The first expansion valve 14, which serves as the first throttling device, adjusts the flow rate and pressure of the refrigerant flowing through the heat medium heat exchanger 13, for example. The receiver 15 is located between the first expansion valve 14 and the second expansion valve 16 in the refrigerant circuit 10 and is a container that stores excess refrigerant. The second expansion valve 16, which serves as the second throttling device, adjusts the flow rate and pressure of the refrigerant. Here, the first expansion valve 14 and the second expansion valve 16 in the first embodiment are assumed to be electronic expansion valves that can change their opening degrees based on instructions from the heat source-side control device 110.

[0017] The air heat exchanger 17 exchanges heat between the refrigerant and outside air, which is, for example, air from outdoors. The air heat exchanger 17 functions as an evaporator or a heat absorber, and evaporates the refrigerant.

[0018] Although not particularly limited, the refrigerant flowing through the refrigerant circuit 10 of the heat source unit 100 in Embodiment 1 is a flammable refrigerant such as a hydrofluoroolefin-based refrigerant or a HC (hydrocarbon)-based refrigerant. Flammable refrigerants generally have a low global warming potential.

[0019] 1 , the heating operation of the refrigerant circuit 10 will be described based on the flow of refrigerant in the refrigerant circuit 10. Actuators such as the compressor 11 in the refrigerant circuit 10 are controlled by a control device (not shown) that controls devices in the heat source unit 100. During the heating operation, the refrigerant circulates through the compressor 11, four-way valve 12, heat medium heat exchanger 13, first expansion valve 14, receiver 15, second expansion valve 16, air heat exchanger 17, four-way valve 12, and compressor 11 in this order.

[0020] The high-temperature, high-pressure gas-phase refrigerant (hereinafter referred to as gas refrigerant) discharged from the compressor 11 flows into the heat medium heat exchanger 13 via the four-way valve 12. The gas refrigerant that has flowed into the heat medium heat exchanger 13 is condensed and liquefied while releasing heat in the heat medium heat exchanger 13, which functions as a condenser, to become a high-pressure, low-temperature liquid-phase refrigerant (hereinafter referred to as liquid refrigerant). As the refrigerant passing through the heat medium heat exchanger 13 releases heat, the water flowing through the heat medium circuit 20 that passes through the heat medium heat exchanger 13 is heated.

[0021] The liquid refrigerant that flows out of the heat medium heat exchanger 13 is decompressed by the first expansion valve 14 and flows into the receiver 15, where a portion of the liquid refrigerant is accumulated. The refrigerant that flows out of the receiver 15 is decompressed by the second expansion valve 16 and becomes two-phase refrigerant, which flows into the air heat exchanger 17. The refrigerant that flows into the air heat exchanger 17 exchanges heat with outside air and evaporates to become gas refrigerant. The gas refrigerant that flows out of the air heat exchanger 17 passes through the four-way valve 12 and is drawn into the compressor 11.

[0022] On the other hand, the heat medium circuit 20 has a water tank 21, a load heat exchanger 22, an immersion heater 23, a booster heater 24, a three-way valve 25, a strainer 26, a flow switch 27, a pump 28, an expansion tank 29, a gas-liquid separator 30, and a heat medium heat exchanger 13. Of the devices in the heat medium circuit 20, the heat medium heat exchanger 13, the expansion tank 29, the pump 28, and the gas-liquid separator 30 are included in the heat source unit 100. The other devices are included in the load unit 200. The load unit 200 in the first embodiment has a load-side control device 210 that controls the devices in the load unit 200 in cooperation with the heat source-side control device 110.

[0023] The load unit 200 is installed indoors, for example. The load unit 200 has a water tank 21, which is a container that stores water. The water tank 21 contains a load heat exchanger 22 connected to the heat medium circuit 20. The load heat exchanger 22 exchanges heat between the water serving as a heat medium circulating through the heat medium circuit 20 and the water stored in the water tank 21, thereby heating the water stored in the water tank 21. The load heat exchanger 22 is, for example, a plate heat exchanger or a coil. The water tank 21 also contains an immersion heater 23. The immersion heater 23 is a heating device that further heats the water stored in the water tank 21. The water stored in the water tank 21 is transported from the water tank 21 by a water pump 31 and supplied to sanitary equipment 500 connected to, for example, a bath or shower.

[0024] The booster heater 24 is a device that further heats the water in the heat medium circuit 20 when, for example, the heating capacity of the heat source unit 100 is insufficient. The three-way valve 25 is a device that branches the water in the heat medium circuit 20. For example, the three-way valve 25 is a valve that switches the water in the heat medium circuit 20 to a flow path that flows to the water tank 21 side or a flow path to which a radiator 400 such as a floor heater is connected. The strainer 26 is a device that removes scale (deposits) in the heat medium circuit 20. The flow switch 27 is a device that detects whether the flow rate circulating in the heat medium circuit 20 is equal to or greater than a certain amount.

[0025] The pump 28 of the heat source unit 100 is a device that pressurizes the water in the heat medium circuit 20 and circulates it within the heat medium circuit 20. The expansion tank 29 is a device that adjusts the pressure in the pipes of the heat medium circuit 20, which changes due to changes in the volume of water caused by heating, etc., within a certain range.

[0026] The gas-liquid separation device 30 separates gas from the water flowing through the heat medium circuit 20. The gas-liquid separation device 30 in the first embodiment further discharges the separated gas to the outside of the heat medium circuit 20. Here, the gas-liquid separation device 30 is installed in a position close to the downstream side of the heat medium heat exchanger 13 with respect to the flow of water as the heat medium so that the gas refrigerant does not circulate through the heat medium circuit 20 when it flows in from the heat medium heat exchanger 13. This makes it possible to suppress a rise in pressure within the heat medium circuit 20. Furthermore, by discharging the gas refrigerant to the outside, if the refrigerant is a flammable refrigerant, it is possible to prevent flammable gas from flowing indoors via the heat medium circuit 20.

[0027] Fig. 2 is a diagram illustrating the configuration of the gas-liquid separation device 30 according to the first embodiment. The gas-liquid separation device 30 in Fig. 2 is partially cross-sectionally shown to illustrate the internal structure. As shown in Fig. 2, the gas-liquid separation device 30 includes a gas-liquid separation section 310, an inlet section 320, an outlet section 330, and a discharge section 340.

[0028] The gas-liquid separator 310 in the first embodiment has a container 311 , an inlet pipe port 312 , an outlet pipe port 313 , an exhaust connection portion 314 , a flow rectifying plate 315 , a gas-liquid separator plate 316 , and a gas-liquid separator plate support portion 317 .

[0029] The container 311 in the first embodiment is formed by integrating a cylindrical upper portion 311A ​​and a tapered lower portion 311B. The cylindrical upper portion 311A, which forms the container upper portion of the container 311, has a cylindrical shape so that the heat transfer medium that flows therein forms a swirling flow within the container 311. The tapered lower portion 311B, which forms the container lower portion of the container 311, is also cylindrical like the cylindrical upper portion 311A, but has a tapered shape in which the diameter of the circle in the cylindrical shape decreases toward the bottom.

[0030] The inlet pipe port 312 is an opening at the upper side of the container 311 that communicates with an inlet pipe 321 of the inlet section 320 (described later). The outlet pipe port 313 is an opening at the lowermost tip of the tapered lower section 311B of the container 311 that communicates with an outlet pipe 331 of the outlet section 330 (described later). The outlet connection section 314 is a through-hole that serves as a flow path connecting to an exhauster 341 of the exhaust section 340 installed on the upper surface of the container 311. A rectifying plate 315 is installed within the flow path of the exhaust connection section 314. The rectifying plate 315 is, for example, a plate that separates the heat transfer medium and rectifies the flow of gas rising within the container 311 and leads it to the exhaust section 340. The rectifying plate 315 interferes with the movement of the rising bubbles, suppressing turbulence and rectifying the gas flow.

[0031] The gas-liquid separation plate support 317 supports the gas-liquid separation plate 316 in the tapered lower portion 311B of the container 311 so that it is positioned at the center of the circle of the cylindrical container 311. The gas-liquid separation plate 316 blocks the flow of gas that gathers at the center of the circle in the cylindrical container 311 due to the swirling flow and attempts to flow together with the water toward the outlet pipe port 313, causing the gas to float toward the discharge connection portion 314. As described above, in the gas-liquid separation section 310 of the gas-liquid separation device 30, the water in the container 311 undergoes a swirling flow. At this time, the water flows as a vortex. If gas is contained in the water, the centrifugal force generated by the swirling flow causes the gas, which is lighter than liquid water, to gather toward the center of the circle in the cylindrical container 311 while defoaming. When the gas that gathers toward the center of the circle and descends with the water comes into contact with the gas-liquid separation plate 316, its flow weakens and its buoyancy increases. Therefore, the gas does not flow out of the outlet pipe port 313 but floats up in the direction of the exhaust connection part 314 .

[0032] Furthermore, in the gas-liquid separation section 310, by using a container 311 in which the diameter of the cylindrical shape decreases in the direction toward the outlet pipe port 313, as in the tapered lower portion 311B, the angular velocity of the heat transfer medium flowing in a swirling flow increases. This improves the separation performance between a gas, such as a refrigerant, and water, which is the heat transfer medium. Here, the gas tends to gather closer to the center of the container 311 as it approaches the lower part of the container 311. Therefore, by installing the gas-liquid separation plate 316 at a lower position in the tapered lower portion 311B, closer to the outlet pipe port 313, the separation performance between water and gas improves. However, since a narrower flow path in the tapered lower portion 311B increases pressure loss, the position and size of the gas-liquid separation plate 316 should be determined within an acceptable pressure loss range.

[0033] The inlet section 320 allows water to flow into the container 311. The inlet section 320 has an inlet pipe 321 connected to the cylindrical upper section 311A ​​at an upper portion of the side surface of the cylindrical upper section 311A. The inlet pipe 321 is connected to the cylindrical upper section 311A ​​so that the water serving as the heat transfer medium flows in a tangential direction of a circle in the cylindrical shape of the cylindrical upper section 311A. By allowing the water serving as the heat transfer medium to flow in the tangential direction of the circle, the water flowing in the container 311 becomes a swirling flow. The inlet pipe 321 has an inlet port 322 at one end that is connected to a pipe that forms a flow path of the heat transfer medium circuit 20. The other end of the inlet pipe 321 is connected to the container 311 and communicates with the interior of the container 311 via the inlet pipe port 312.

[0034] The outlet 330 allows the liquid component of the gas-liquid two-phase fluid to flow out of the apparatus. The outlet 330 has an outlet pipe 331 connected to the container 311 at a lower part of the side surface of the container 311. The outlet pipe 331 has an outlet port 332 at one end connected to a pipe that forms a flow path of the heat medium circuit 20. The other end of the outlet pipe 331 is connected to the container 311 and communicates with the inside of the container 311 via an outlet pipe port 313.

[0035] The discharge unit 340 is installed on the upper surface of the container 311 and discharges the gas separated in the container 311. The discharge unit 340 includes a discharger 341 and a discharge port 342. The discharger 341 also includes a discharge valve (not shown). The discharge valve of the discharger 341 is an automatic air vent valve that opens and closes according to the pressure based on the amount of gas separated in the container 311, automatically discharging the gas. The discharger 341 includes a float (not shown) that moves vertically inside. For example, when the separated gas flows into the discharger 341, the pressure of the gas in the discharger 341 exceeds the pressure of the water, pushing down the float, causing the discharge valve to open the discharge port 342. This allows the gas in the heat medium circuit 20 to be released, thereby reducing the pressure therein. Therefore, when a gas refrigerant or the like flows into the heat medium circuit 20 due to damage to the heat medium heat exchanger 13 or the like and the pressure in the heat medium circuit 20 increases, the inflowing gas refrigerant or the like can be discharged. When the gas is released to the outside through the exhaust port 342 and the water pressure exceeds the gas pressure, the float is pushed up, causing the exhaust valve to close the exhaust port 342 .

[0036] Here, there are other causes for the pressure inside the heat medium circuit 20 to increase. For example, air may be generated when the heating temperature of water is high. If the generated air flows into the pump 28, the pump 28 may run idle (air entrapment). Therefore, the gas-liquid separation device 30 separates the generated air from the water in the gas-liquid separation section 310 and discharges the gas from the discharge section 340 as described above, thereby preventing air entrapment and lowering the pressure inside the heat medium circuit 20.

[0037] As described above, according to the hot water supply system using the heat medium circulation system of the first embodiment, the heat medium circuit 20, part of which is installed in the heat source unit 100, includes the gas-liquid separation device 30. The gas-liquid separation unit 310 swirls the water serving as the heat medium flowing into the container 311, separating the gas flowing in with the heat medium. Therefore, when the refrigerant flows into the heat medium circuit 20 via the heat medium heat exchanger 13, the gas-liquid separation device 30 can efficiently separate the gas refrigerant by the swirling flow. This is particularly effective when the refrigerant is a flammable refrigerant, as it can be separated and discharged outdoors. Furthermore, air generated by heating the water can be separated, protecting the pump 28 from idling.

[0038] The gas-liquid separation device 30 in the first embodiment also has a discharge unit 340, and can discharge the gas separated by the gas-liquid separation unit 310 from a discharge port 342. At this time, in the discharge unit 340, the discharger 341 opens and closes the discharge valve depending on the amount of gas in the heat medium circuit 20, so that a pressure increase due to the gas flowing in the heat medium circuit 20 can be suppressed, and the pressure in the heat medium circuit 20 can be adjusted.

[0039] Furthermore, the gas-liquid separator 30 in the first embodiment has a flow straightening plate 315 that straightens the gas rising to the upper part of the container 311. This allows a large amount of gas to be discharged without stagnation. The container 311 also has a tapered lower part 311B. This allows the swirling heat transfer medium to flow out of the gas-liquid separator 30.

[0040] Embodiment 2. Figures 3 to 6 are diagrams showing examples of the shape of the current plate 315 according to embodiment 2. Figures 3 to 6 are views of the current plate 315 as seen from above the gas-liquid separation device 30. Figure 3 shows a case in which the current plate 315 divides the connection flow path of the discharge connection part 314 into two. Figure 4 shows a case in which the current plate 315 divides the connection flow path of the discharge connection part 314 into three. Figure 5 shows a case in which the current plate 315 divides the connection flow path of the discharge connection part 314 into four. Figure 6 shows a case in which the current plate 315 divides the connection flow path of the discharge connection part 314 into six.

[0041] If the number of partitions in the current plate 315 is large, the movement of the floating bubbles can be suppressed and the current effect is increased, but the speed of the gas slows down. For this reason, it is desirable to use a current plate 315 that corresponds to the amount of gas discharged.

[0042] In the above embodiment, the heat medium circulation system is used in a hot water supply system, but the present invention is not limited to this. For example, the heat medium circulation system can be used in an air conditioner or a chiller system that uses a heat medium.

[0043] Furthermore, the heat source unit 100 in the above-described embodiment includes the devices of the refrigerant circuit 10, but the devices other than the heat medium heat exchanger 13 may be configured as separate units.

[0044] 100 heat source unit, 110 heat source side control device, 200 load unit, 210 load side control device, 300 piping, 400 radiator, 500 sanitary equipment, 10 refrigerant circuit, 11 compressor, 12 four-way valve, 13 heat medium heat exchanger, 14 first expansion valve, 15 receiver, 16 second expansion valve, 17 air heat exchanger, 20 heat medium circuit, 21 water tank, 22 load heat exchanger, 23 immersion heater, 24 booster heater, 25 three-way valve, 26 strainer, 27 flow switch, 28 pump, 29 expansion tank, 30 gas-liquid separator, 31 water pump, 310 gas-liquid separator, 311 container, 311A ​​cylindrical upper part, 311B tapered lower part, 312 inlet pipe port, 313 outlet pipe port, 314 Discharge connection section, 315 rectifier plate, 316 gas-liquid separation plate, 317 gas-liquid separation plate support section, 320 inflow section, 321 inflow pipe, 322 inflow port, 330 outflow section, 331 outflow pipe, 332 outflow port, 340 discharge section, 341 discharge machine, 342 discharge port.

Claims

1. A heat source unit that supplies heat to a liquid heat medium flowing through a pipe, a heat medium heat exchanger that exchanges heat between the heat medium and a refrigerant; a gas-liquid separation device having a cylindrical container and an inlet pipe connected in a tangential direction to the cylindrical container, the heat medium for the heat medium heat exchanger being introduced from the inlet pipe, swirling the heat medium in the container, and separating the gaseous refrigerant flowing into the container from the heat medium; A heat source unit comprising:

2. The heat source unit according to claim 1 , wherein the gas-liquid separator has a discharge part that discharges the gaseous refrigerant from a discharge port in accordance with the pressure in the pipe through which the heat medium flows.

3. The heat source unit according to claim 2 , wherein the gas-liquid separator includes a flow straightening plate for guiding the gaseous refrigerant on a connecting flow path between the inside of the container and the outlet.

4. The heat source unit according to any one of claims 1 to 3, wherein the container has an outlet pipe opening at the bottom thereof that communicates with an outlet pipe through which the heat transfer medium flows out, and the shape of the bottom of the container leading to the outlet pipe opening is a tapered shape with a cylindrical diameter that decreases.

5. The heat source unit according to claim 4 , wherein the gas-liquid separator has a gas-liquid separator plate at a lower part of the container that blocks the refrigerant from flowing with the heat medium.

6. The heat source unit according to any one of claims 1 to 3, comprising a refrigerant circuit in which a compressor that compresses the refrigerant, the heat medium heat exchanger, an expansion valve that decompresses the refrigerant, and an air heat exchanger that exchanges heat between the refrigerant and external air are connected by refrigerant piping.

7. The heat source unit according to claim 6 , wherein the refrigerant is a flammable refrigerant.

8. The heat source unit according to any one of claims 1 to 3, wherein the gas-liquid separator is disposed downstream of the heat medium heat exchanger in the flow of the heat medium.

9. The heat source unit according to any one of claims 1 to 3, a load unit having a load heat exchanger that exchanges heat with a load to supply heat from the heat source unit to the heat load; A heat transfer medium circulation system in which the above-mentioned components are connected by piping to form a heat transfer medium circuit.

10. The heat source unit is installed outdoors, The load unit is installed indoors, The heat medium circulation system according to claim 9 , wherein the heat source unit installed outdoors includes the gas-liquid separator.