Split type air conditioning unit capable of realizing total heat and partial heat recovery

Abstract

The utility model discloses a split type air conditioning unit capable of realizing total heat and partial heat recovery, which relates to the technical field of data center air conditioning systems and comprises a condenser, a liquid storage tank, an expansion valve, a surface air cooler, a gas-liquid separator, a compressor and a heat recovery heat exchanger which are sequentially connected. The other end is connected with the condenser; the system further comprises a water source multi-split heat supply system connected with the heat recovery heat exchanger, two circulation pipelines are connected between the water source multi-split heat supply system and the heat recovery heat exchanger and are a refrigerant pipeline and a cooling water pipeline respectively, and a cooling water pump is arranged on the cooling water pipeline. Waste heat of a data center I T machine room during cold supply operation of the air conditioning unit in winter is recycled through cooling water in the water source multi-split host, and heat is supplied to an auxiliary area, an office area and other areas in the data center through the water source multi-split host and the air conditioning indoor unit, so that the waste heat utilization efficiency and the energy utilization efficiency of the data center are greatly improved; and meanwhile, the heating energy consumption is reduced.

Description

Technical Field

[0001] This utility model relates to the field of data center air conditioning system technology, specifically to a split-type air conditioning unit that can achieve full heat and partial heat recovery. Background Technology

[0002] The emergence of large AI models has not only brought about high energy consumption, but also a significant increase in the power density of single racks in data centers. In order to solve the heat dissipation problem of high power density racks, air conditioning equipment that is closer to the heat source is needed for cooling. However, traditional room-level refrigerant pump DX data center air conditioners cannot solve the problem of local hot spots better. Therefore, an air conditioning cooling device that is closer to the heat dissipation equipment of the rack is needed. This can solve the problem of local hot spots and reduce the energy consumption of the data center air conditioning system. The closer the air conditioning equipment is to the heat source, the lower the cooling loss, and therefore the lower the energy consumption.

[0003] Currently, widely used split-type direct expansion precision air conditioners for data centers can meet the above needs. They consist of an outdoor condenser and an indoor precision air conditioner. The outdoor condenser primarily cools the heat dissipated by the indoor precision air conditioner and the heat generated by its own compressor or refrigerant pump. The indoor precision air conditioner mainly absorbs the heat dissipated by the IT equipment in the data center. However, currently, both split-type direct expansion precision air conditioners and split-type refrigerant pump direct expansion precision air conditioners can only provide cooling for the data center and cannot recover waste heat from the IT equipment, resulting in significant energy waste. Furthermore, data center auxiliary equipment areas and office areas also require heating in winter. Currently, data centers using split-type direct expansion precision air conditioners or split-type refrigerant pump direct expansion precision air conditioners for cooling typically rely on municipal heating or electric boilers for heating in winter. These two heating methods are not only energy-intensive and power-intensive, but also have high operating costs and do not comply with national energy conservation standards and environmental protection policies. Utility Model Content

[0004] To address one or more shortcomings of the existing technology, this utility model provides a split-type air conditioning unit that can achieve both total heat and partial heat recovery, which can improve the utilization efficiency of waste heat and energy use in data centers and reduce heating energy consumption in office areas.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A split-type air conditioning unit capable of realizing total heat and partial heat recovery includes a condenser, a liquid receiver, an expansion valve, a surface cooler, a gas-liquid separator, a compressor, and a heat recovery heat exchanger connected in sequence. One end of the heat recovery heat exchanger is connected to the compressor, and the other end is connected to the condenser.

[0007] It also includes a water source multi-split heating system connected to the heat recovery heat exchanger. The water source multi-split heating system is connected to the heat recovery heat exchanger by two circulation pipelines, namely a refrigerant pipeline and a cooling water pipeline, and a cooling water pump is installed on the cooling water pipeline.

[0008] As a further implementation, the water source multi-split heating system includes a water source multi-split main unit and multiple water source multi-split indoor units. The water source multi-split main unit is connected to the heat recovery heat exchanger through the refrigerant pipeline and the cooling water pipeline, and the refrigerant pipeline and the cooling water pipeline exchange heat within the water source multi-split main unit.

[0009] As a further implementation, the cooling water pump is installed between the main unit of the water source multi-split air conditioner and the heat recovery heat exchanger, serving as the water circulation power for the cooling water pipeline to provide cooling water for heat exchange in the heat recovery heat exchanger.

[0010] As a further implementation, multiple water source multi-split air conditioning indoor units are connected in parallel. The main unit of the water source multi-split air conditioning system is connected to each indoor unit by a refrigerant gas pipe and a refrigerant flow pipe. Gaseous refrigerant enters the indoor unit of the water source multi-split air conditioning system from the main unit through the refrigerant gas pipe and exchanges heat with the indoor circulating air. After heat exchange, the liquid refrigerant returns to the main unit of the water source multi-split air conditioning system through the refrigerant flow pipe.

[0011] As a further implementation, the condenser is located outdoors, with one end connected to a heat recovery heat exchanger and the other end connected to a liquid storage tank, which can increase the cooling capacity of the air conditioning system.

[0012] As a further implementation, a check valve is provided between the compressor and the heat recovery heat exchanger.

[0013] As a further implementation, a fluorine pump is installed on the pipeline between the storage tank and the expansion valve, allowing the system to cool naturally in winter, which is more energy-efficient.

[0014] As a further implementation, a first reversing valve is connected in parallel at the fluorine pump, and a second reversing valve is connected in parallel at the compressor, for switching operating modes.

[0015] As a further implementation, a third reversing valve is provided between the gas-liquid separator and the heat recovery heat exchanger. The third reversing valve is connected in parallel with the pipeline where the compressor and check valve are located. The third reversing valve is located between the outlet of the gas-liquid separator and the inlet of the compressor, which can allow some refrigerant to flow back to the compressor inlet, ensuring that the compressor can operate normally under low load conditions.

[0016] As a further implementation, the heat recovery heat exchanger is a shell-and-tube heat exchanger or a plate heat exchanger; the compressor is a scroll compressor; and the condenser is a dry condenser or an indirect evaporative condenser.

[0017] By adopting the above technical solution, the beneficial effects of this utility model are as follows:

[0018] This invention incorporates a heat recovery heat exchanger for refrigerant and water between the compressor and the outdoor condenser, and adds a water-source multi-split air conditioning system. By using the cooling water inside the water-source multi-split air conditioning unit, it recovers the waste heat from the data center's IT room during winter cooling operation. The heat is then supplied to auxiliary areas and offices within the data center through the water-source multi-split air conditioning unit and indoor air conditioning units, significantly improving the efficiency of waste heat utilization and energy use in the data center while reducing heating energy consumption. Attached Figure Description

[0019] The accompanying drawings, which form part of this specification, are used to provide a further understanding of this utility model. The illustrative embodiments of this utility model and their descriptions are used to explain this utility model and do not constitute an improper limitation of this utility model.

[0020] Figure 1 This is a schematic diagram of the system structure of an embodiment of the present utility model. Figure 1 ;

[0021] Figure 2 This is a schematic diagram of the system structure of an embodiment of the present utility model. Figure 2 .

[0022] In the diagram: 1. Condenser; 2. Compressor; 3. Receiver; 4. Expansion valve; 5. Surface cooler; 6. Gas-liquid separator; 7. Heat recovery heat exchanger; 8. Cooling water pump; 9. Water source multi-split air conditioner main unit; 10. Water source multi-split air conditioner indoor unit; 11. Refrigerant pump; 12. Check valve; 13. First reversing valve; 14. Second reversing valve; 15. Third reversing valve; 16. Refrigerant gas pipe; 17. Refrigerant flow pipe. Detailed Implementation

[0023] It should be noted that the following detailed description is illustrative and intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used in this invention have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains.

[0024] It should be noted that the terminology used herein is for descriptive purposes only and is not intended to limit the exemplary embodiments according to this invention. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without inventive effort are within the scope of protection of this invention.

[0025] Example 1

[0026] In one typical embodiment of this application, a split-type air conditioning unit capable of achieving both total heat and partial heat recovery is provided, such as... Figure 1-2 As shown, the system includes a condenser 1, a compressor 2, a liquid receiver 3, an expansion valve 4, a surface cooler 5, a gas-liquid separator 6, and a heat recovery heat exchanger 7. The condenser 1, liquid receiver 3, expansion valve 4, surface cooler 5, gas-liquid separator 6, compressor 2, and heat recovery heat exchanger 7 are connected in sequence. One end of the heat recovery heat exchanger 7 is connected to the compressor 2, and the other end is connected to the condenser 1.

[0027] It also includes a water source multi-split heating system connected to the heat recovery heat exchanger 7. The water source multi-split heating system is connected to the heat recovery heat exchanger by two circulation pipelines, namely a refrigerant pipeline and a cooling water pipeline. A cooling water pump 8 is installed on the cooling water pipeline.

[0028] Specifically, the water source multi-split heating system includes a water source multi-split main unit 9 and multiple water source multi-split indoor units 10. The water source multi-split main unit is connected to the heat recovery heat exchanger via refrigerant pipelines and cooling water pipelines, and heat exchange occurs within the water source multi-split main unit. Figure 1 , 2As shown, one end of the heat recovery heat exchanger 7 is connected to the exhaust pipe of the compressor 2, and the other end is connected to the condenser 1. The water source multi-split heating system includes a water source multi-split main unit 9 and multiple water source multi-split indoor units 10 connected in parallel. The water source multi-split indoor units are installed in auxiliary areas and office areas of the data center and can exchange heat with indoor circulating air. Specifically, a refrigerant gas pipe 16 and a refrigerant flow pipe 17 are connected between the water source multi-split main unit 9 and each water source multi-split indoor unit 10; gaseous refrigerant enters the water source multi-split indoor unit 10 from the water source multi-split main unit 9 through the refrigerant gas pipe 16 to exchange heat with the indoor circulating air, and the liquid refrigerant after heat exchange returns to the water source multi-split main unit 9 through the refrigerant flow pipe 17. The water source multi-split unit 9 and the heat recovery heat exchanger 7 are connected by two parallel pipelines, namely a refrigerant pipeline and a cooling water pipeline. The water source multi-split unit is connected to the refrigerant pipeline and the cooling water pipeline respectively, so that the refrigerant and cooling water can exchange heat in the water source multi-split unit.

[0029] Specifically, the cooling water pump 8 is installed on the cooling water pipeline between the main unit 9 of the water source multi-split air conditioner and the heat recovery heat exchanger 7, and serves as the water circulation power for the cooling water pipeline to provide cooling water for heat exchange in the heat recovery heat exchanger 7.

[0030] In this embodiment, cooling water exchanges heat with the high-temperature, high-pressure refrigerant vapor discharged from the compressor 2 in the heat recovery heat exchanger 7. The heated cooling water enters the water source multi-split air conditioner 9 through the cooling water pipeline to release heat, and then returns to the heat recovery heat exchanger 7 after cooling down. When the unit is in cooling operation, the liquid refrigerant can enter the water source multi-split air conditioner 9 and absorb the heat released by the cooling water, becoming a high-temperature, high-pressure gaseous refrigerant. The high-temperature, high-pressure gaseous refrigerant can be transported to the terminal air conditioning indoor unit 10 to exchange heat with the indoor circulating air, thereby raising the temperature of the indoor circulating air and providing heating to the room. After releasing heat, the gaseous refrigerant condenses into liquid refrigerant and then enters the water source multi-split air conditioner 9 to absorb heat and become a high-temperature, high-pressure gaseous refrigerant. It then enters the air conditioning indoor unit 10 through the gaseous refrigeration pipeline and provides heating to the room, thus completing one heating cycle.

[0031] Specifically, such as Figure 1 , 2 As shown, a check valve is provided between the compressor 2 and the heat recovery heat exchanger 7 to prevent steam from flowing back into the compressor.

[0032] Specifically, such as Figure 1 , 2 As shown, the condenser 1 is located outdoors. One end of the condenser 1 is connected to the heat recovery heat exchanger 7, and the other end is connected to the liquid storage tank 3, which can improve the cooling capacity of the air conditioning system. The condenser can be a dry condenser or an indirect evaporator condenser, used to condense high-temperature and high-pressure refrigerant vapor into liquid refrigerant.

[0033] In a preferred embodiment, such as Figure 2 As shown, a refrigerant pump 11 is installed on the pipeline between the liquid storage tank 3 and the expansion valve 4. This pump can replace the compressor to drive the unit, allowing the system to cool naturally in winter, thus saving energy. Specifically, a first reversing valve 13 is connected in parallel to the refrigerant pump 11, and a second reversing valve 14 is connected in parallel to the compressor 2 to switch operating modes. When operating in compressor mode, the first reversing valve 13 is open and the second reversing valve 14 is closed; when operating in refrigerant pump mode, the first reversing valve 13 is closed and the second reversing valve 14 is open.

[0034] In addition, such as Figure 2 As shown, a third reversing valve 15 is installed between the gas-liquid separator 6 and the heat recovery heat exchanger 7. The third reversing valve 15 is connected in parallel with the pipeline containing the compressor and check valve. Specifically, the third reversing valve 15 is located between the outlet of the gas-liquid separator 6 and the inlet of the compressor 2. The third reversing valve 15 opens when the compressor load rate is low, regulating the return of a portion of the refrigerant from the compressor outlet to the compressor inlet, ensuring the compressor can operate normally under low load. The heat recovery heat exchanger can be a shell-and-tube heat exchanger or a plate heat exchanger, used for heat exchange between high-temperature, high-pressure refrigerant vapor and cooling water.

[0035] In this embodiment, a scroll compressor is used to compress low-pressure refrigerant vapor into high-temperature and high-pressure refrigerant vapor.

[0036] The compressor mode of the split-type air conditioning unit in this embodiment is as follows: Figure 1 As shown, during summer operation, condenser 1, compressor 2, liquid receiver 3, expansion valve 4, surface cooler 5, and gas-liquid separator 6 are turned on, while cooling water pump 8, water source multi-split unit 9, and water source multi-split unit indoor unit are turned off 10. At this time, heat recovery heat exchanger 7 only serves as a passage for refrigerant flow and does not perform heat recovery.

[0037] The summer operating procedure is as follows: Gaseous refrigerant discharged from the surface cooler 5 enters the compressor 2, where it is pressurized into a high-temperature, high-pressure gaseous refrigerant. This high-temperature, high-pressure gaseous refrigerant then flows through refrigerant pipes into the outdoor condenser 1, where it is cooled into a liquid refrigerant by the cold outdoor air. The liquid refrigerant then expands through the expansion valve 4 into a gas-liquid mixture before entering the surface cooler 5. Inside the surface cooler 5, it exchanges heat with the hot air discharged from the servers and IT equipment in the computer room. After the hot air cools down, it returns to the IT equipment for cooling. After heat exchange in the surface cooler 5, the gas-liquid mixture is converted back into a gaseous refrigerant, which then enters the compressor 2 and is pressurized into a high-temperature, high-pressure gaseous refrigerant, thus beginning the next refrigeration cycle.

[0038] When the system is running in winter, it can cool the data center while recovering heat for heating. At this time, the compressor 2, liquid storage tank 3, expansion valve 4, surface cooler 5, gas-liquid separator 6, heat recovery heat exchanger 7, cooling water pump 8, water source multi-split unit 9, and water source multi-split unit indoor unit 10 are all turned on and running, while the outdoor condenser 1 can be turned on and off depending on the heat recovery heat exchange situation.

[0039] The winter operating procedure is as follows: The high-temperature, high-pressure refrigerant vapor discharged from compressor 2 enters the heat recovery heat exchanger 7 through the refrigerant pipeline. It first exchanges heat with the cooling water supplied by cooling water pump 8, and after the heat exchange, the refrigerant is cooled into a liquid. It then enters the outdoor condenser 1 to be further cooled by the outdoor air. This further cooling increases the cooling capacity of the air conditioning system. When the air conditioning system does not require further cooling, the outdoor condenser 1 can be left idle and only serve as a refrigerant passage. The liquid refrigerant, further cooled by the outdoor condenser 1, enters the expansion valve 4 through the liquid receiver 3 and expands into a gas-liquid mixture. This mixture then enters the surface cooler 5 to exchange heat with the hot air discharged from the IT equipment in the computer room, cooling the hot air before cooling the IT equipment. After heat exchange in the surface cooler 5, the gas-liquid mixture is converted into a gaseous refrigerant, which then enters the compressor 2 and is pressurized into a high-temperature, high-pressure gaseous refrigerant, thus entering the next refrigeration cycle.

[0040] Furthermore, the cooling water that absorbs heat in the heat recovery heat exchanger 7 increases in temperature and then enters the water source multi-split air conditioner main unit to release heat, thus decreasing in temperature. The cooled water is then pressurized by the cooling water pump 8 and returned to the heat recovery heat exchanger 7 to exchange heat with the high-temperature, high-pressure exhaust gas from the compressor 2, thus starting the next heat recovery cycle. After absorbing heat, the refrigerant liquid entering the main unit 9 is converted into a high-temperature, high-pressure gaseous refrigerant. The high-temperature, high-pressure gaseous refrigerant is then transported through refrigerant pipes to the terminal air conditioning indoor unit 10 to exchange heat with the indoor circulating air, increasing the temperature of the indoor circulating air and thus providing heating to the room. The gaseous refrigerant that releases heat condenses into liquid refrigerant and then enters the water source multi-split air conditioner main unit 9 to absorb heat and become a high-temperature, high-pressure gaseous refrigerant again. It then enters the air conditioning indoor unit 10 through gaseous refrigerant pipes to provide heating to the room, and the system enters the next heat recovery heating cycle.

[0041] The refrigerant pump mode of the split-type air conditioning unit in this embodiment is as follows: Figure 2 As shown, during summer cooling-only operation, refrigerant pump 11 is shut off. At this time, heat recovery heat exchanger 7 serves only as a refrigerant flow path and does not perform heat recovery. The system operation process is similar to... Figure 1 The process is the same. When the system operates in winter, it simultaneously provides circulating cooling and heat recovery, combined with... Figure 2As shown, the liquid storage tank 3, expansion valve 4, surface cooler 5, gas-liquid separator 6, heat recovery heat exchanger 7, cooling water pump 8, water source multi-split unit 9, water source multi-split unit indoor unit 10, and refrigerant pump 11 are all turned on and running. At this time, the compressor 2 is turned off, while the outdoor condenser 1 can be turned on and off depending on the heat recovery heat exchange situation.

[0042] When the system is running, the high-temperature refrigerant vapor discharged from the indoor surface cooler 5 enters the heat recovery heat exchanger 7 through the refrigerant pipeline and exchanges heat with the cooling water. After the heat exchange, the refrigerant is cooled into liquid by the condenser and then enters the outdoor condenser 1 to be cooled again by the outdoor air. The effect of recooling can increase the cooling capacity of the air conditioning system. When the cooling capacity requirement of the air conditioning system does not require recooling, the outdoor condenser 1 can be shut down and only serve as a passage for the refrigerant. The liquid refrigerant that has been cooled again by the outdoor condenser 1 enters the expansion valve 4 through the liquid storage tank 3 to expand, and then enters the indoor air conditioning surface cooler 5 to exchange heat with the hot air discharged from the IT equipment in the computer room to cool the hot air. The cooled cold air then cools the IT equipment. The cooling water temperature rises after absorbing heat in the heat recovery heat exchanger 7. After heating, the cooling water enters the water source multi-split unit to release heat and lower its temperature. The cooled water is then pressurized by the cooling water pump 8 and sent to the heat recovery heat exchanger 7 to exchange heat with the high-temperature refrigerant exhaust from the indoor air conditioner surface cooler 5, thus starting the next cooling and heat recovery cycle. After absorbing heat, the liquid refrigerant entering the water source multi-split unit 9 is converted into a high-temperature, high-pressure gaseous refrigerant. The high-temperature, high-pressure gaseous refrigerant is then transported through the gaseous refrigerant pipeline to the terminal air conditioner indoor unit and exchange heat with the indoor circulating air, raising the temperature of the circulating air and providing heat to the room. The gaseous refrigerant that has released heat condenses into liquid refrigerant and then enters the water source multi-split unit 9 again to absorb heat and become a high-temperature, high-pressure gaseous refrigerant. It then enters the air conditioner indoor unit 10 through the gaseous refrigerant pipeline and provides heat to the room. The system then enters the next heat recovery heating cycle.

[0043] In the above embodiments, a heat recovery heat exchanger for refrigerant and water is installed between the compressor and the outdoor condenser, and a water source multi-split heating system is added. The waste heat of the data center IT room is recovered by the cooling water in the water source multi-split system during the winter cooling operation of the air conditioning unit, and the auxiliary areas and office areas in the data center are heated through the water source multi-split system host and air conditioning indoor units, which greatly improves the waste heat utilization and energy utilization efficiency of the data center, while reducing heating energy consumption.

[0044] It should be noted that the above embodiments are only used to illustrate the technical solution of this utility model, and are not intended to limit it. Those skilled in the art should understand that this utility model can have various modifications and variations. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A split-type air conditioning unit capable of realizing total heat and partial heat recovery, characterized in that, It includes a condenser, a liquid receiver, an expansion valve, a surface cooler, a gas-liquid separator, a compressor, and a heat recovery heat exchanger connected in sequence. One end of the heat recovery heat exchanger is connected to the compressor, and the other end is connected to the condenser. It also includes a water source multi-split heating system connected to the heat recovery heat exchanger. The water source multi-split heating system is connected to the heat recovery heat exchanger by two circulation pipelines, namely a refrigerant pipeline and a cooling water pipeline, and a cooling water pump is installed on the cooling water pipeline.

2. A split-type air conditioning unit capable of realizing total heat and partial heat recovery as described in claim 1, characterized in that, The water source multi-split heating system includes a water source multi-split main unit and multiple water source multi-split indoor units. The water source multi-split main unit is connected to the heat recovery heat exchanger through refrigerant pipelines and cooling water pipelines. The refrigerant pipelines and cooling water pipelines exchange heat within the water source multi-split main unit.

3. A split-type air conditioning unit capable of realizing total heat and partial heat recovery as described in claim 2, characterized in that, The cooling water pump is installed between the main unit of the water source multi-split air conditioner and the heat recovery heat exchanger, and serves as the water circulation power for the cooling water pipeline to provide cooling water for heat exchange in the heat recovery heat exchanger.

4. A split-type air conditioning unit capable of realizing total heat and partial heat recovery as described in claim 2, characterized in that, Multiple water source multi-split air conditioning indoor units are connected in parallel. The main unit of the water source multi-split air conditioning system is connected to each indoor unit by a refrigerant gas pipe and a refrigerant flow pipe. Gaseous refrigerant enters the indoor unit of the water source multi-split air conditioning system from the main unit of the water source multi-split air conditioning system through the refrigerant gas pipe and exchanges heat with the indoor circulating air. After heat exchange, the liquid refrigerant returns to the main unit of the water source multi-split air conditioning system through the refrigerant flow pipe.

5. A split-type air conditioning unit capable of realizing total heat and partial heat recovery as described in claim 1, characterized in that, The condenser is located outdoors, with one end connected to a heat recovery heat exchanger and the other end connected to a liquid storage tank.

6. A split-type air conditioning unit capable of realizing total heat and partial heat recovery as described in claim 1, characterized in that, A check valve is provided between the compressor and the heat recovery heat exchanger.

7. A split-type air conditioning unit capable of realizing total heat and partial heat recovery as described in claim 1, characterized in that, A fluorine pump is installed on the pipeline between the storage tank and the expansion valve.

8. A split-type air conditioning unit capable of realizing total heat and partial heat recovery as described in claim 7, characterized in that, A first reversing valve is connected in parallel at the fluorine pump, and a second reversing valve is connected in parallel at the compressor.

9. A split-type air conditioning unit capable of realizing total heat and partial heat recovery as described in claim 6, characterized in that, A third reversing valve is provided between the gas-liquid separator and the heat recovery heat exchanger. The third reversing valve is connected in parallel with the pipeline containing the compressor and the check valve. The third reversing valve is located between the outlet of the gas-liquid separator and the inlet of the compressor.

10. A split-type air conditioning unit capable of realizing total heat and partial heat recovery as described in claim 1, characterized in that, The heat recovery heat exchanger is a shell-and-tube heat exchanger or a plate heat exchanger; the compressor is a scroll compressor; and the condenser is a dry condenser or an indirect evaporative condenser.

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