Direct evaporative refrigerant pump hybrid air conditioning system

Abstract

The utility model relates to a kind of direct evaporative refrigerant pump composite air conditioning system, host unit includes compressor, condenser, liquid accumulator, refrigerant pump, electronic expansion valve and evaporator, the exhaust port of compressor is connected with the import of condenser, condenser, refrigerant pump, electronic expansion valve and evaporator are sequentially connected in series, the outlet of evaporator is connected with the back gas port of compressor;One-way valve is connected between the import and export of compressor, one-way valve is connected between the import and export of refrigerant pump;Evaporative cooling unit includes the spray nozzle or spray nozzle acting on condenser, connects cooling water.Direct evaporative cooling mode, compression refrigeration mode, composite mode and fluorine pump mode can be operated according to outdoor temperature and indoor load respectively, spray cooling or spray cooling is reasonably utilized, water resource is saved, outdoor air temperature is reduced, condensing temperature is reduced, and system operating efficiency is higher.

Description

Technical Field

[0001] This utility model belongs to the field of refrigeration, specifically relating to an air conditioning refrigeration system that combines a direct evaporation refrigerant pump. Background Technology

[0002] With the proposal and advancement of a series of information technology projects such as "Internet+" and "Big Data Applications," the scale and number of data centers have grown rapidly, becoming major electricity consumers in the information society. To ensure the efficient and reliable operation of data centers, it is necessary to quickly dissipate the heat generated by the servers during operation. Statistics show that data centers in modern society consume 5% of the total electricity in society. To reduce the energy consumption of data centers and rationally allocate social resources, it is necessary to optimize the data center cooling system. Utilizing natural cooling sources is currently the preferred method to solve the high energy consumption problem of data center computer rooms, and natural cooling sources are renewable energy sources. The use of outdoor natural cooling sources has attracted the attention of industry scholars and engineers, and engineering technology research has been carried out in different forms, such as fresh air systems, air-to-air heat exchange systems, and air-to-water heat exchange systems. In addition, composite air conditioning systems composed of various heat pipes are constantly being proposed and applied, such as gravity-type split heat pipes, liquid pump-powered split heat pipes, and air pump-powered split heat pipes. China has a wide range of climates, with abundant water resources in the south and abundant natural cold sources in the north. To develop a direct evaporation refrigerant pump composite air conditioning system, it is necessary to adapt to the different climates in the north and south, save water resources, and achieve the goal of energy saving and electricity saving. Utility Model Content

[0003] The technical problem to be solved by this application is to provide a composite refrigeration system that integrates heat pipe technology, evaporative cooling technology and compression refrigeration technology, and switches the refrigeration mode according to the environment to significantly reduce refrigeration energy consumption.

[0004] The technical solution adopted to solve the above problems is as follows: a direct evaporation refrigerant pump composite air conditioning system, characterized in that: it includes a main unit and an evaporation cooling unit, the main unit includes a compressor, a condenser, a liquid receiver, a refrigerant pump, an electronic expansion valve and an evaporator, the exhaust port of the compressor is connected to the inlet of the condenser, the outlet of the condenser is connected to the inlet of the liquid receiver, the outlet of the liquid receiver is connected to the inlet of the refrigerant pump, the outlet of the refrigerant pump is connected to the inlet of the electronic expansion valve, the outlet of the electronic expansion valve is connected to the inlet of the evaporator, and the outlet of the evaporator is connected to the return port of the compressor; a one-way valve is connected in parallel between the inlet and outlet of the compressor, and a one-way valve is connected in parallel between the inlet and outlet of the refrigerant pump; the evaporation cooling unit includes a spray nozzle or a mist nozzle that acts on the condenser, the spray nozzle or mist nozzle is connected to water through a pipeline, and the condenser (2) is a direct evaporation condenser.

[0005] Preferably, the compressor is a single unit or multiple units connected in parallel.

[0006] Preferably, the evaporative cooling unit includes a water pump, a water tank, and a water collection tray. The water collection tray is used to collect the cooling water after it has absorbed heat from the spray nozzles or mist nozzles. The water collection tray is connected to the water tank, and the spray nozzles or mist nozzles are connected to the water tank through pipelines to form an evaporative condensation water circulation system.

[0007] Preferably, the evaporative cooling unit forms a semi-enclosed structure around the condenser by setting an air filter, thus sealing the return air passage of the condenser.

[0008] Compared with existing technologies, the advantages of this utility model are as follows: In order to achieve safe and reliable operation of data centers and to meet the energy-saving needs of the northern and southern regions, heat pipe technology, evaporative cooling technology and compression refrigeration technology are integrated. It can operate in direct evaporative cooling mode, compression refrigeration mode, combined mode and refrigerant pump mode according to outdoor temperature and indoor load. It can effectively utilize outdoor natural cold sources during day and night, transitional seasons and winter. Under outdoor high temperature conditions, spray / mist cooling can be turned on to reduce air temperature, thereby reducing condensation temperature, reducing compressor pressurization to compensate for temperature difference, achieving efficient condensation of high temperature and high pressure refrigerant gas, and improving the operating energy efficiency of air conditioning system.

[0009] By using an air filter to partially seal the outdoor condenser (sealing the return air inlet of the outdoor condenser while leaving the air inlet unsealed), the cleanliness of the air and spray / spray water is improved, preventing the condenser and water circulation pump from being clogged by dust and debris. This also ensures the cleanliness of the spray / spray evaporative cooling water, preventing the formation of scale on the heat exchanger surface and allowing minerals and corrosive substances to further damage the metal surface. This enhances the heat exchanger's corrosion resistance and reliability on top of various anti-corrosion coatings.

[0010] It adapts to the climate characteristics of both the north and south, makes reasonable use of spray cooling or mist cooling, collects and recycles evaporative condensate water, and saves water resources. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the direct evaporation refrigerant pump combined air conditioning system in the embodiment, showing the spray mode;

[0012] Figure 2 This is a schematic diagram of the direct evaporation refrigerant pump combined air conditioning system in the embodiment, showing the spray mode;

[0013] Figure 3 This is a circulation diagram of the evaporative cooling mode and the spray mode.

[0014] Figure 4 This is a cycle diagram for evaporative cooling mode and spray mode;

[0015] Figure 5 This is a cycle diagram for compression refrigeration mode and spray mode;

[0016] Figure 6 This is a cycle diagram for compression refrigeration mode and spray mode;

[0017] Figure 7 This is a composite mode cycle diagram, specifically the spray mode.

[0018] Figure 8 This is a composite mode cycle diagram, specifically a spray mode.

[0019] Figure 9 Fluorine pump mode, spray mode;

[0020] Figure 10 Fluorine pump mode, spray mode;

[0021] In the diagram, 1. Compressor, 2. Condenser, 3. Receiver, 4. Refrigerant pump, 5. Electronic expansion valve, 6. Evaporator, 7. Check valve, 8. Water pump, 9. Water tank, 10. Drain tray, 11. Air filter, 12. Spray nozzle, 13. Mist nozzle. Detailed Implementation

[0022] The present application will be further described in detail below with reference to the accompanying drawings. The embodiments described are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0023] like Figure 1 , 2 The diagram shown is a structural diagram of a direct evaporation refrigerant pump combined air conditioning system under spray and mist condensation modes.

[0024] The system includes a main unit and an evaporative cooling unit. The main unit includes a compressor 1, a condenser 2, a receiver 3, a refrigerant pump 4, an electronic expansion valve 5, and an evaporator 6. In this embodiment, the refrigerant is fluorinated, and a fluorinated pump is used as the refrigerant pump 4. A one-way valve 7 is connected in parallel at the inlet and outlet of both the compressor 1 and the refrigerant pump 4. When the compressor is not in operation, the outlet of the evaporator 6 is directly connected to the inlet of the condenser 2 via the pipeline containing the one-way valve 7.

[0025] The evaporative cooling unit includes a water pump 8, a water tank 9, a spray nozzle 12 (spray mode) or a mist nozzle 13 (mist mode), and a water receiving tray 10. For the air conditioning system in spray mode, the nozzle can be a mist nozzle 13.

[0026] Compressor 1 can be a single unit or multiple units connected in parallel. Each compressor has an exhaust port and a return port. The exhaust port and return port of the compressor are connected in parallel to a one-way valve pipeline. The compressor meets the service conditions for safe operation under the condition of compression ratio 1.2≤ξ.

[0027] The exhaust port of compressor 1 is connected to the inlet of condenser 2, where condenser 2 is a direct evaporation condenser.

[0028] The outlet of condenser 2 is connected to the inlet of liquid receiver 3, the outlet of liquid receiver 3 is connected to the inlet of refrigerant pump 4, and the outlet of refrigerant pump 4 is connected to the inlet of electronic expansion valve 5. A one-way valve is connected in parallel to the inlet and outlet of refrigerant pump 4. When the refrigerant pump is not in operation, the outlet of liquid receiver 3 is directly connected to the inlet of electronic expansion valve 5 through the one-way valve.

[0029] The outlet of the electronic expansion valve 5 is connected to the inlet of the evaporator 6; the outlet of the evaporator 6 is connected to the suction port (return port) of the compressor 1.

[0030] The outlet of the water pump 8 of the evaporative cooling unit is connected to the spray / spray pipeline. The cooling water reaches the spray nozzle / spray nozzle through the spray / spray pipeline. After absorbing heat, most of the cooling water drips into the water collection tray 10. The outlet of the water collection tray 10 is then connected to the water tank 9, which collects the cooling water. The water tank 9 is connected to the water pump 8, forming a cycle of cooling water.

[0031] The evaporative cooling unit uses an air filter 11 to form a semi-enclosed structure around the condenser 2, sealing the return air vent of the condenser, purifying the air, and maintaining the equipment.

[0032] The main unit can switch between evaporative cooling mode, compression refrigeration mode, combined mode, and refrigerant pump mode based on the outdoor temperature or the size of the terminal (indoor) load, as described in detail below:

[0033] Evaporative cooling mode cycle diagram as follows Figure 3 , 4 When there is no natural cold source available outdoors (T > T1 and the outdoor dry-bulb / wet-bulb temperature difference ΔT ≥ 5℃), the system operates in evaporative cooling mode to dissipate heat for the data center. At this time, refrigerant pump 4 in the main unit is off. The system consists of compressor 1, condenser 2, receiver 3, electronic expansion valve 5, and evaporator 6, forming a refrigeration cycle unit. Simultaneously, the evaporative cooling unit starts, further reducing the outdoor air temperature, improving the heat dissipation efficiency of condenser 2, and ensuring that the cooling capacity is transferred to the terminal evaporator 6 to provide cooling for the data center under high-temperature conditions. Since there is no natural cold source at this time, condensation can only be achieved by compensating for the temperature difference with the outdoor temperature through compressor 1 pressurization. The direct operation of the evaporative cooling unit reduces the compressor's compensation temperature difference, reduces compressor power, and thus improves the air conditioning system's energy efficiency ratio. Using air filter 11 to seal the condenser return air passage ensures clean return air, effectively preventing the heat exchanger fins from becoming clogged and increasing air-side resistance, and preventing dust, debris, etc., from mixing with water to form a scale layer on the heat exchanger surface, allowing minerals and corrosive substances to further damage the metal surface.

[0034] For example, when the return air temperature of the data center air conditioning terminal is controlled at 24℃, the supply air temperature is 12~15℃, and the evaporation temperature is about 8~10℃. When the outdoor dry-bulb temperature is higher than 25℃ and the outdoor dry-bulb and wet-bulb temperature difference ΔT≥5℃, the unit operates in evaporative cooling mode. For example, if the outdoor temperature is 35℃, using a traditional condenser, the condensation temperature is about 45~48℃. However, by turning on spray / spray evaporative cooling for condensation and heat dissipation, the condensation temperature can be reduced to 35~40℃. This reduces the compressor pressure compensation temperature difference, improves the compressor operating efficiency, and allows the high-temperature and high-pressure gaseous refrigerant to be efficiently condensed into liquid refrigerant and stored in the liquid receiver. Then, through the electronic expansion valve, the pressure is reduced to become a low-temperature and low-pressure gas-liquid mixed state refrigerant, cooling the return air temperature from 24℃ to 12~15℃. At this time, the outdoor wet-bulb temperature is used as the indicator for switching the operating mode.

[0035] Compression refrigeration mode such as Figure 5 , 6 When there is no natural cold source available outdoors (i.e., T > T1 and the outdoor dry-bulb / wet-bulb temperature difference ΔT ≤ 5℃), the system operates in compression refrigeration to dissipate heat for the data center, and the evaporative cooling unit is shut down. At this time, the refrigerant pump 4 in the main unit is off. The system consists of compressor 1, condenser 2, receiver 3, electronic expansion valve 5, and evaporator 6, forming a refrigeration cycle unit. This ensures that the cooling capacity is transferred to the terminal evaporator to provide cooling for the data center under high-temperature conditions. Since there is no natural cold source at this time, condensation can only be achieved by compensating for the temperature difference with the outdoor temperature through compressor pressurization.

[0036] For example, when the return air temperature of the data center air conditioning terminal is controlled at 24℃, the supply air temperature is 12~15℃, and the evaporation temperature is about 8~10℃. When the outdoor dry-bulb temperature is higher than 25℃ and the outdoor dry-bulb and wet-bulb temperature difference ΔT≤5℃, the unit operates in compression cooling mode. For example, when the outdoor air temperature is 35℃ and the dry-bulb and wet-bulb temperature difference is small under high relative humidity saturation, the spray / spray evaporative cooling unit is turned off. The compressor discharges high-temperature and high-pressure gaseous refrigerant into the condenser for condensation and heat dissipation. The condensation temperature is about 45~48℃, and it becomes liquid refrigerant and enters the liquid receiver for storage. Then, it is throttled and depressurized through the electronic expansion valve to become a low-temperature and low-pressure gas-liquid mixed refrigerant, which cools the return air temperature from 24℃ to 12~15℃ to dissipate heat for the data center. At this time, the outdoor dry-bulb temperature is used as the indicator for switching the operating mode.

[0037] Composite mode such as Figure 7 , 8When a certain amount of natural cold source is available outdoors (i.e., T2 < T ≤ T1), the system operates in a composite mode to dissipate heat for the data center. In this mode, the system consists of a compressor 1, condenser 2, receiver 3, refrigerant pump 4, electronic expansion valve 5, and evaporator 6, forming a composite circulation unit. This unit lowers the return air temperature to the target value to provide cooling for the data center. Due to the availability of a natural cold source, condensation is achieved by appropriately pressurizing the compressor to compensate for the temperature difference with the outdoor temperature. The compressor operates at a low compression ratio, resulting in high energy efficiency. However, because of the low compression ratio, the pressure difference may be insufficient for the system to achieve oil return and motor cooling functions. Therefore, the refrigerant pump is activated to compensate for the pressure difference and maintain the system's safe and stable operation.

[0038] For example, when the return air temperature of the data center air conditioning terminal is controlled at 24℃, the supply air temperature is 12~15℃, and the evaporation temperature is about 8~10℃. When the outdoor temperature is below 25℃ or above 5℃, the unit operates in a composite mode. For example, when the outdoor temperature is 15℃, since there is a certain natural cold source, the condensing temperature is low. Using a traditional condenser, the condensing temperature is about 25~28℃. The compressor is appropriately pressurized to discharge gaseous refrigerant into the condenser for condensation and heat dissipation, turning it into liquid refrigerant which enters the liquid receiver for storage. The refrigerant pump is used for pressurization compensation to ensure that the compressor can return oil normally and the motor is cooled. Then, it enters the electronic expansion valve for throttling and depressurization to become a low-temperature, low-pressure gas-liquid mixture of refrigerant, cooling the return air temperature from 24℃ to 12~15℃ to dissipate heat for the data center. At this time, the outdoor dry-bulb temperature is used as the indicator for switching the operating mode.

[0039] Fluorine pump mode such as Figure 9 , 10 When the outdoor natural cooling source is sufficient (i.e., T≤T2), the system operates in refrigerant pump mode to dissipate heat for the data center. At this time, the compressor is off. The refrigerant pump circulation unit, consisting of condenser 2, liquid receiver 3, refrigerant pump 4, electronic expansion valve 5, and evaporator 6, lowers the return air temperature to the target value to provide cooling for the data center. Since the natural cooling source is sufficient at this time, the compressor does not need to operate. Because the power of the refrigerant pump is much lower than that of the compressor, significant energy savings can be achieved. The refrigerant pump 4 delivers the naturally cooled liquid refrigerant to the terminal evaporator 6, transferring the cooling capacity to the return air to cool the data center.

[0040] For example, when the return air temperature of the data center air conditioning terminal is controlled at 24℃, the supply air temperature is 12~15℃, and the evaporation temperature is about 8~10℃. When the outdoor temperature is below 5℃, the unit runs in refrigerant pump mode. For example, if the outdoor temperature is 5℃, since there is sufficient natural cold source, the compressor is turned off. Driven by the refrigerant pump, the gaseous refrigerant that has absorbed heat after evaporation in the terminal evaporator enters the condenser for condensation and heat dissipation. The condensation temperature is about 12~15℃, condensing the refrigerant into a liquid state and storing it in the liquid receiver. The refrigerant pump then performs pressurization compensation, and then enters the electronic expansion valve for throttling and depressurization to become a low-temperature, low-pressure gas-liquid mixture of refrigerant, which is then transported to the terminal evaporator to cool the data center.

[0041] The aforementioned air conditioning system combines the advantages of direct evaporation cooling technology and refrigerant pump hybrid air conditioning technology to provide a direct evaporation refrigerant pump hybrid air conditioning system. It can operate in direct evaporation cooling mode, compression refrigeration mode, hybrid mode, and refrigerant pump mode according to outdoor temperature and indoor load. It can effectively utilize outdoor natural cold sources during day and night, transitional seasons, and winter. At the same time, under high-temperature conditions, in order to adapt to the climate characteristics of the north and south, it makes reasonable use of spray cooling or mist cooling to save water resources, reduce outdoor air temperature, and further reduce condensation temperature, making the system more efficient.

[0042] At the same time, it overcomes the defects of direct evaporative cooling, seals the return air side of the condenser, and designs a water circulation system for the evaporative condensation unit. This ensures that most of the evaporative condensation water is recycled, avoiding waste of water resources. It also prevents dust and debris from clogging the condenser fins, maintains the cleanliness of the spray / atomized evaporative cooling water, and prevents the formation of scale on the heat exchanger surface, which would allow the minerals and corrosive substances in the scale to further damage the metal surface. This improves the corrosion resistance of the heat exchanger on the basis of various anti-corrosion coatings.

Claims

1. A direct evaporation refrigerant pump combined air conditioning system, characterized in that: The system includes a main unit and an evaporative cooling unit. The main unit includes a compressor (1), a condenser (2), a liquid receiver (3), a refrigerant pump (4), an electronic expansion valve (5), and an evaporator (6). The exhaust port of the compressor (1) is connected to the inlet of the condenser (2), the outlet of the condenser (2) is connected to the inlet of the liquid receiver (3), the outlet of the liquid receiver (3) is connected to the inlet of the refrigerant pump (4), the outlet of the refrigerant pump (4) is connected to the inlet of the electronic expansion valve (5), the outlet of the electronic expansion valve (5) is connected to the inlet of the evaporator (6), and the outlet of the evaporator (6) is connected to the return port of the compressor (1). A check valve is connected in parallel between the inlet and outlet of the compressor (1), and a check valve is connected in parallel between the inlet and outlet of the refrigerant pump (4). The evaporative cooling unit includes a spray nozzle (12) or a mist nozzle (13) acting on the condenser (2). The spray nozzle or mist nozzle is connected to the incoming water through a pipeline. The condenser (2) is a direct evaporative condenser.

2. The direct evaporation refrigerant pump combined air conditioning system according to claim 1, characterized in that: The compressor may be a single unit or multiple units connected in parallel.

3. The direct evaporation refrigerant pump combined air conditioning system according to claim 1, characterized in that: The evaporative cooling unit includes a water pump (8), a water tank (9), and a water collection tray (10). The water collection tray (10) is used to collect the cooling water after heat absorption sprayed out by the spray nozzle or mist nozzle. The water collection tray (10) is connected to the water tank (9). The spray nozzle or mist nozzle is connected to the water tank through a pipeline to form an evaporative condensation water circulation.

4. The direct evaporation refrigerant pump combined air conditioning system according to claim 1, characterized in that: The evaporative cooling unit forms a semi-enclosed structure around the condenser (2) by setting an air filter (11) to seal the return air passage of the condenser.

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