Indirect evaporative refrigeration system and control method thereof

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By introducing an indirect evaporative cooling system combining a heat pipe evaporator and mechanical refrigeration into the computer room air conditioning system, combined with photovoltaic power generation and heat recovery, the heat exchange efficiency is optimized, the problems of low efficiency and high energy consumption under wet conditions are solved, and energy consumption is reduced and the system adaptability is achieved.

CN114340334BActive Publication Date: 2025-09-30GUANGDONG SHENLING ENVIRONMENT SYST CO LTD

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Patent Information

Application Number: CN202111574690.8
Authority / Receiving Office: CN · China
Patent Type: Patents(China)
Current Assignee / Owner
Filing Date: 2021-12-21
Publication Date: 2025-09-30
Estimated Expiration: 2041-12-21

AI Technical Summary

Technical Problem

In the existing technology, cross-flow plate heat exchangers have low efficiency under wet conditions, high mechanical refrigeration energy consumption, and a risk of short circuit. They cannot effectively utilize the heat of the condenser, resulting in low efficiency of computer room air conditioning units in South China.

Method used

Heat pipe evaporators are used to pre-cool the return air from the computer room. Combined with mechanical refrigeration mechanisms, heat pipe condensers are optimized through cooling and dehumidification mechanisms and heating mechanisms. Photovoltaic power generation and heat recovery systems are used to reduce energy consumption. Control methods are used to adjust the working mode according to climatic conditions.

Benefits of technology

It improves the heat exchange efficiency of the heat pipe evaporator and condenser, reduces the load of mechanical refrigeration, reduces energy consumption, adapts to different climatic conditions, and improves the energy efficiency of the system.

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Abstract

The present invention discloses an indirect evaporative refrigeration system and a control method thereof, wherein the indirect evaporative refrigeration system includes a first air duct, a second air duct, a power supply mechanism and a mechanical refrigeration mechanism, the mechanical refrigeration mechanism includes a first evaporator, a heat pipe evaporator and the first evaporator are arranged in the first air duct, and a cooling and dehumidifying mechanism and a heat pipe condenser are sequentially arranged in the second air duct along the exhaust direction, the cooling and dehumidifying mechanism is used to cool the refrigerant in the heat pipe condenser; the cooling and dehumidifying mechanism and the mechanical refrigeration mechanism are electrically connected to the power supply mechanism respectively; the indirect evaporative refrigeration system disclosed in the present application adopts indirect evaporative hot and cold pipes in combination with the mechanical refrigeration mechanism, which can reduce the working energy consumption of the refrigeration system; the cooling and dehumidifying mechanism can reduce the influence of humid air on the refrigeration system, improve the heat exchange efficiency of the heat pipe evaporator and the heat pipe condenser, reduce the workload of the mechanical refrigeration mechanism, and further reduce the working energy consumption of the refrigeration system.

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Description

Technical Field

[0001] The present invention relates to the technical field of air-conditioning equipment, and in particular to an indirect evaporative refrigeration system and a control method thereof. Background Art

[0002] The energy consumption of the cooling system in the computer room data center reaches 40% of the energy consumption of the entire data center. Therefore, the key to reducing the energy consumption of the data center is to reduce the energy consumption of the cooling system of the computer room data center.

[0003] Currently, indirect evaporative cooling technology is widely used in data centers. Combining indirect evaporative cooling with mechanical refrigeration effectively utilizes natural cooling resources and reduces the energy consumption of air conditioning units. Most computer room air conditioning (AHU) units use a cross-flow plate heat exchanger as the heat exchange core. The return air from the computer room is pre-cooled by the cross-flow plate heat exchanger and then cooled by mechanical refrigeration to reach the set supply air temperature. However, air conditioning units using cross-flow plate heat exchangers have the following significant disadvantages during operation:

[0004] 1. When operating under wet conditions, the relative humidity of the environment is high, the efficiency of the heat exchange core is low, and mechanical refrigeration needs to bear a greater load. Therefore, this type of air-conditioning unit is only suitable for the northwest region of my country. For the climate in southern my country, there are problems such as low heat exchange efficiency of the air-conditioning unit and high energy consumption of mechanical refrigeration.

[0005] 2. The cross-flow plate heat exchanger has high requirements for the sealing of different flow channels. It is extremely easy to short-circuit during operation, causing the outdoor air in the secondary air channel to enter the primary air duct through the heat exchange core and then enter the machine room, causing damage and impact on the equipment in the machine room.

[0006] 3. The heat generated by the condenser cannot be reasonably recovered and utilized, and the heat utilization efficiency of the entire unit is low.

[0007] It can be seen that the existing technology still needs to be improved and enhanced. Summary of the Invention

[0008] In view of the above-mentioned deficiencies in the prior art, the object of the present invention is to provide an indirect evaporative refrigeration system that can reduce the impact of humid air on the heat pipe condenser and heat pipe evaporator, improve the heat exchange efficiency of the heat pipe evaporator, and thus reduce the operating energy consumption of the refrigeration system.

[0009] In order to achieve the above object, the present invention adopts the following technical solutions:

[0010] An indirect evaporative refrigeration system includes a first air duct, a second air duct, a power supply mechanism and a mechanical refrigeration mechanism, the mechanical refrigeration mechanism includes a first evaporator, a heat pipe evaporator and the first evaporator are arranged in the first air duct, and a cooling and dehumidifying mechanism and a heat pipe condenser are arranged in sequence in the second air duct along the exhaust direction, the cooling and dehumidifying mechanism is used to cool the refrigerant in the heat pipe condenser; the cooling and dehumidifying mechanism and the mechanical refrigeration mechanism are respectively electrically connected to the power supply mechanism.

[0011] In the indirect evaporative refrigeration system, the cooling and dehumidification mechanism includes a first fan, a working area of a dehumidification wheel and a cooling box arranged in sequence along the exhaust direction; a spray device is provided above the cooling box, and the cooling box is filled with PVC filler; the heat pipe condenser is arranged on the exhaust side of the cooling box; the first fan, the spray device and the dehumidification wheel are electrically connected to the power supply mechanism respectively.

[0012] The indirect evaporative refrigeration system further includes a third air duct, the mechanical refrigeration mechanism also includes a first condenser, a heating mechanism and the first condenser are provided in the third air duct, the regeneration zone of the dehumidification wheel is located in the third air duct, and the heating mechanism is used to restore the dehumidification capacity of the dehumidification wheel; the heating mechanism is electrically connected to the power supply mechanism.

[0013] In the indirect evaporative refrigeration system, the heating mechanism includes a second fan, a hot water coil and a water supply mechanism, and the second fan, the first condenser, the hot water coil and the regeneration area of the dehumidification wheel are arranged in sequence in the third air duct along the exhaust direction; the water supply mechanism is connected to the hot water coil, and the second fan is electrically connected to the power supply mechanism.

[0014] In the indirect evaporative refrigeration system, the power supply mechanism includes a photovoltaic panel, a battery and an inverter. The photovoltaic panel is connected to the input end of the battery, the output end of the battery is connected to the input end of the inverter, and the output end of the inverter is respectively connected to the first fan, the second fan, the spray device, the dehumidification wheel, the water supply mechanism and the mechanical refrigeration mechanism; the water supply mechanism is used to recover the heat of the photovoltaic panel.

[0015] In the indirect evaporative refrigeration system, the water supply mechanism includes a water tank and a water supply pump. The water tank is used to recover the heat of the photovoltaic panel. The water tank is connected to the hot water coil through the water supply pump, and the water supply pump is electrically connected to the output end of the inverter.

[0016] In the indirect evaporative refrigeration system, the mechanical refrigeration mechanism also includes a compressor, a liquid reservoir, an expansion valve and a gas-liquid separator. The compressor, the first condenser, the liquid reservoir, the expansion valve, the first evaporator and the gas-liquid separator are connected end to end in sequence; the compressor is electrically connected to the power supply mechanism.

[0017] The present invention also provides a control method for an indirect evaporative refrigeration system. The control method is used to implement the operation control of any of the above-described indirect evaporative refrigeration systems. The indirect evaporative refrigeration system further includes a temperature sensor for detecting the dry-bulb temperature of outdoor fresh air and a hygrometer for detecting the humidity of outdoor fresh air. The power supply mechanism further includes a control device. The control method comprises the following steps:

[0018] A first dry-bulb temperature, a second dry-bulb temperature and a first relative humidity are pre-set in the control device;

[0019] The control device obtains the real-time fresh air temperature fed back by the temperature sensor;

[0020] The control device obtains the real-time humidity fed back by the hygrometer and calculates the real-time relative humidity based on the real-time humidity;

[0021] If the real-time fresh air temperature is less than or equal to the first dry-bulb temperature, the control device controls the first fan to operate, and the dehumidification wheel, spray device, heating mechanism and mechanical refrigeration mechanism do not operate; the heat pipe evaporator cools the return air from the machine room, and the first fan delivers outdoor fresh air to cool the refrigerant in the heat pipe condenser;

[0022] If the first dry-bulb temperature is less than the real-time fresh air temperature and less than the second dry-bulb temperature and the real-time relative humidity is less than the first relative humidity, the control device controls the first fan and the spray device to operate, and the dehumidification wheel, the heating mechanism, and the mechanical refrigeration mechanism to stop operating; the heat pipe evaporator cools the return air from the machine room, and the outdoor fresh air delivered by the first fan is cooled by the spray device and then used to cool the refrigerant in the heat pipe condenser;

[0023] If the first dry-bulb temperature is less than the real-time fresh air temperature and less than the second dry-bulb temperature and the real-time relative humidity is greater than the first relative humidity, the control device controls the first fan, the spray device, the dehumidification wheel and the heating mechanism to operate, and the mechanical refrigeration mechanism does not operate; the heat pipe evaporator cools the return air from the machine room, and the outdoor fresh air delivered by the first fan is first dehumidified in the working area of the dehumidification wheel, and then cooled by the spray device and then cooled to cool the refrigerant in the heat pipe condenser; the heating mechanism heats the regeneration area of the dehumidification wheel;

[0024] If the real-time fresh air temperature is greater than the second dry-bulb temperature and the real-time relative humidity is less than or equal to the first relative humidity, the control device controls the first fan, the spray device, and the mechanical refrigeration mechanism to operate, the dehumidification wheel and the heating mechanism to stop operating, and the heat pipe evaporator and the mechanical refrigeration mechanism to cool the return air from the machine room; the outdoor fresh air delivered by the first fan is cooled by the spray device and then used to cool the refrigerant in the heat pipe condenser;

[0025] If the real-time fresh air temperature is greater than the second dry-bulb temperature and the real-time relative humidity is greater than the second relative humidity, the control device controls the first fan, the spray device, the dehumidification wheel, the mechanical refrigeration mechanism and the heating mechanism to operate, and the heat pipe evaporator and the mechanical refrigeration mechanism cool the return air from the computer room; the outdoor fresh air delivered by the first fan is first dehumidified in the working area of the dehumidification wheel, and then cooled by the spray device to cool the refrigerant in the heat pipe condenser; the heating mechanism heats the regeneration area of the dehumidification wheel.

[0026] In the control method, the first dry-bulb temperature is 2° C., the second dry-bulb temperature is 10° C., and the first relative humidity is 30%.

[0027] Beneficial effects:

[0028] The present invention provides an indirect evaporative refrigeration system, which adopts a heat pipe evaporator to pre-cool the return air of the computer room, and then cooperates with a mechanical refrigeration mechanism to further cool the return air of the computer room, ensuring that the supply air temperature meets the needs of the computer room, while reducing the working energy consumption of the refrigeration system; the cooling and dehumidification mechanism can reduce the impact of humid air on the refrigeration system, improve the heat exchange efficiency of the heat pipe evaporator and the heat pipe condenser, reduce the workload of the mechanical refrigeration mechanism, and further reduce the working energy consumption of the refrigeration system. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 A schematic structural diagram of the indirect evaporative refrigeration system provided by the present invention;

[0030] Figure 2 A system structure diagram of the indirect evaporative refrigeration system provided by the present invention;

[0031] Figure 3 This is a logic flow chart of the control method provided by the present invention.

[0032] Explanation of the main component symbols: 11-first air duct, 12-second air duct, 13-third air duct, 21-photovoltaic panel, 22-battery, 23-inverter, 24-control device, 31-compressor, 32-first condenser, 33-liquid reservoir, 34-expansion valve, 35-first evaporator, 36-gas-liquid separator, 41-heat pipe evaporator, 42-heat pipe condenser, 51-first fan, 52-dehumidification wheel, 53-cooling box, 54-spraying device, 61-second fan, 62-hot water coil, 63-water storage tank, 64-water supply pump, 71-temperature sensor, 72-hygrometer. DETAILED DESCRIPTION

[0033] The present invention provides an indirect evaporative refrigeration system and a control method thereof. To make the purpose, technical solution and effects of the present invention clearer and more specific, the present invention is further described in detail below with reference to the accompanying drawings and examples.

[0034] In the description of the present invention, it should be understood that the terms "installation" and "connection" should be understood in a broad sense. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0035] See also Figure 1 and Figure 2 The present invention provides an indirect evaporative refrigeration system, including a first air duct 11, a second air duct 12, a power supply mechanism and a mechanical refrigeration mechanism, the mechanical refrigeration mechanism including a first evaporator 35, a heat pipe evaporator 41 and the first evaporator 35 are arranged in the first air duct 11, and a cooling and dehumidifying mechanism and a heat pipe condenser 42 are arranged in sequence along the exhaust direction in the second air duct 12, the cooling and dehumidifying mechanism is used to cool the refrigerant in the heat pipe condenser 42; the cooling and dehumidifying mechanism and the mechanical refrigeration mechanism are respectively electrically connected to the power supply mechanism.

[0036] The indirect evaporative refrigeration system disclosed in the present application adopts a heat pipe evaporator 41 to pre-cool the return air from the machine room, and then cooperates with the first evaporator 35 of the mechanical refrigeration mechanism to further cool the return air from the machine room, ensuring that the supply air temperature meets the needs of the machine room, while reducing the working energy consumption of the refrigeration system; the cooling and dehumidification mechanism can reduce the impact of humid air on the refrigeration system, improve the heat exchange efficiency of the heat pipe evaporator 41 and the heat pipe condenser 42, reduce the workload of the mechanical refrigeration mechanism, and further reduce the working energy consumption of the refrigeration system.

[0037] Specifically, the first air duct 11 inputs the return air of the computer room, which is first cooled by the heat pipe evaporator 41, and then cooled by the first evaporator 35 of the mechanical refrigeration mechanism before returning to the computer room environment; the second air duct 12 inputs outdoor fresh air, which is cooled and dehumidified by the cooling and dehumidification mechanism, and then cools the refrigerant in the heat pipe condenser 42, so that the refrigerant in the heat pipe condenser 42 and the heat pipe evaporator 41 automatically circulates under pressure, and the outdoor fresh air after heat exchange is discharged to the outdoor environment.

[0038] Further, see Figure 1 and Figure 2 The cooling and dehumidifying mechanism includes a first fan 51, a working area of a dehumidifying wheel 52 and a cooling box 53 arranged in sequence along the exhaust direction. A spray device 54 is provided above the cooling box 53. The cooling box 53 is filled with PVC filler, and the spray water output by the spray device 54 forms a water film on the PVC filler; the heat pipe condenser 42 is provided on the exhaust side of the cooling box 53; the first fan 51, the spray device 54 and the dehumidifying wheel 52 are electrically connected to the power supply mechanism respectively; the power supply mechanism adjusts the working state of the dehumidifying wheel 52 and the spray device 54 according to the real-time fresh air temperature and the real-time relative humidity When the first fan 51, the dehumidification wheel 52 and the spray device 54 are working at the same time, the first fan 51 delivers outdoor fresh air to the working area of the dehumidification wheel 52. After being dehumidified, the outdoor fresh air enters the water film in the PVC filler, and heat and mass transfer occurs with the water film, the temperature of the outdoor fresh air decreases, and then heat is exchanged with the refrigerant in the heat pipe condenser 42; the refrigerant absorbs the heat of the return air from the machine room in the heat pipe evaporator 41, the temperature and pressure increase, and flows to the heat pipe condenser 42; the refrigerant absorbs the cold energy of the spray water and the cold energy of the outdoor fresh air in the heat pipe condenser 42, the temperature and pressure decrease, and then flows back into the heat pipe evaporator 41 for the next cycle.

[0039] Further, see Figure 1 and Figure 2 The indirect evaporative refrigeration system also includes a third air duct 13, and the mechanical refrigeration mechanism also includes a first condenser 32. A heating mechanism and the first condenser 32 are provided in the third air duct 13. The regeneration zone of the dehumidification wheel 52 is located in the third air duct 13. The heating mechanism is used to restore the dehumidification capacity of the dehumidification wheel 52; the heating mechanism is electrically connected to the power supply mechanism.

[0040] The third air duct 13 inputs outdoor fresh air, which is heated by the first condenser 32 and the heating mechanism and then input into the regeneration area of the dehumidification wheel 52 to heat the dehumidification wheel 52, thereby restoring the dehumidification capacity of the dehumidification wheel 52. The outdoor fresh air after heat exchange is discharged to the outdoor environment; the refrigeration system recovers the heat of the first condenser 32 to heat the dehumidification wheel 52, thereby improving energy utilization and further reducing the working energy consumption of the refrigeration system.

[0041] Further, see Figure 1 and Figure 2 The heating mechanism includes a second fan 61, a hot water coil 62 and a water supply mechanism. The regeneration area of the second fan 61, the first condenser 32, the hot water coil 62 and the dehumidification wheel 52 are sequentially arranged in the third air duct 13 along the exhaust direction; the water supply mechanism is connected to the hot water coil 62, and the second fan 61 is electrically connected to the power supply mechanism. The power supply mechanism can adjust the working state of the second fan 61 and the water supply mechanism according to the real-time fresh air temperature and the real-time relative humidity. When the dehumidification wheel 52 is working, The heating mechanism generally works at the same time to ensure that the dehumidification wheel 52 effectively dehumidifies the outdoor fresh air; specifically, the second fan 61 transports the outdoor fresh air to the first condenser 32 of the mechanical refrigeration mechanism, and the outdoor fresh air recovers the heat of the first condenser 32, the temperature rises, and then is heated by the hot water coil 62, the outdoor fresh air is raised to 60°C, and finally enters the regeneration area of the dehumidification wheel 52, desorbs the moisture in the adsorbent in the dehumidification wheel 52, and regenerates the dehumidification wheel 52, that is, the dehumidification wheel 52 has adsorption capacity again.

[0042] Further, see Figure 1 and Figure 2 The power supply mechanism includes a photovoltaic panel 21, a battery 22 and an inverter 23. The photovoltaic panel 21 is connected to the input end of the battery 22, the output end of the battery 22 is connected to the input end of the inverter 23, and the output end of the inverter 23 is respectively connected to the first fan 51, the second fan 61, the spray device 54, the dehumidification wheel 52, the water supply mechanism and the mechanical refrigeration mechanism; the water supply mechanism is used to recover the heat of the photovoltaic panel 21; the power supply mechanism uses solar photovoltaic power generation to store part of the electricity in the battery 22; the power supply mechanism stores the collected heat in the water supply mechanism through water as a medium; in the case of sufficient sunlight, the photovoltaic panel 21 generates photovoltaic power to drive the operation of the electrical equipment in the refrigeration system, such as the mechanical refrigeration mechanism, the cooling and dehumidification mechanism and the heating mechanism; in the absence of light, the electricity stored in the battery 22 maintains the operation of the electrical equipment of the entire refrigeration system.

[0043] Further, see Figure 1 and Figure 2The water supply mechanism includes a water tank 63 and a water supply pump 64. The water tank 63 is used to recover the heat of the photovoltaic panel 21. The water tank 63 is connected to the hot water coil 62 through the water supply pump 64. The heat collected by the photovoltaic panel 21 is stored in the water tank 63 using water as a medium, and then transported to the hot water coil 62 through the water supply pump 64 to heat the outdoor fresh air; the water supply pump 64 is electrically connected to the output end of the inverter 23 to provide a stable working voltage for the operation of the water supply pump 64; the dehumidification wheel 52 is heated by recovering the heat of solar energy, thereby improving energy utilization and further reducing the working energy consumption of the refrigeration system.

[0044] Further, see Figure 1 and Figure 2 The mechanical refrigeration mechanism also includes a compressor 31, a liquid accumulator 33, an expansion valve 34 and a gas-liquid separator 36. The compressor 31, the first condenser 32, the liquid accumulator 33, the expansion valve 34, the first evaporator 35 and the gas-liquid separator 36 are connected end to end in sequence; the compressor 31 is electrically connected to the power supply mechanism, and the compressor 31 is driven by the power supply mechanism. After being compressed by the compressor 31, the refrigerant enters the first condenser 32 to condense into liquid, and then enters the expansion valve 34 to reduce the pressure, and then enters the first evaporator 35 to take away the heat. The heated refrigerant returns to the compressor 31.

[0045] See also Figures 1 to 3 The present invention also provides a control method for an indirect evaporative refrigeration system, the control method being used to implement the operation control of any of the above-described indirect evaporative refrigeration systems, wherein the indirect evaporative refrigeration system further comprises a temperature sensor 71 for detecting the dry-bulb temperature of outdoor fresh air and a hygrometer 72 for detecting the humidity of outdoor fresh air, the power supply mechanism further comprising a control device 24, the first fan 51, the dehumidification wheel 52, the spray device 54, the second fan 61, the water supply pump 64, the compressor 31, the temperature sensor 71, and the hygrometer 72 being electrically connected to the control device 24 respectively; the control method comprising the steps of:

[0046] S100. Pre-set a first dry-bulb temperature, a second dry-bulb temperature, and a first relative humidity in the control device 24. In one embodiment, the first dry-bulb temperature is 2°C, the second dry-bulb temperature is 10°C, and the first relative humidity is 30%. The first dry-bulb temperature, the second dry-bulb temperature, and the first relative humidity are related to the supply air temperature, return air temperature, and heat pipe efficiency required by the center of the data center. The return air temperature of the data center is generally set to 37°C, the required supply air temperature is generally 24°C, and the efficiency of the heat pipe is set to 60%.

[0047] S200, the control device 24 obtains the real-time fresh air temperature fed back by the temperature sensor 71;

[0048] S300, the control device 24 obtains the real-time humidity fed back by the hygrometer 72, and calculates the real-time relative humidity based on the real-time hygrometer 72; the control device 24 adjusts the working state of the indirect evaporative cooling system according to the real-time fresh air temperature and the real-time relative humidity.

[0049] S400. If the real-time fresh air temperature is less than or equal to the first dry-bulb temperature, the control device 24 controls the first fan 51 to operate, and the dehumidification impeller, the spray device 54, the heating mechanism, and the mechanical refrigeration mechanism to not operate; a portion of the electric energy output by the power supply mechanism is used to drive the first fan 51, and the rest is stored in the battery 22 for standby use; the heat pipe evaporator 41 cools the return air from the machine room, and the refrigerant in the heat pipe evaporator 41 evaporates and absorbs heat, causing the temperature and pressure to increase, and the refrigerant moves to the heat pipe condenser 42; the first fan 51 delivers outdoor fresh air to cool the refrigerant in the heat pipe condenser 42, and the refrigerant with reduced temperature returns to the heat pipe evaporator 41 for a new round of circulation.

[0050] S500. If the first dry-bulb temperature is less than the real-time fresh air temperature and less than or equal to the second dry-bulb temperature and the real-time relative humidity is less than or equal to the first relative humidity, the control device 24 controls the first fan 51 and the spray device 54 to operate, and the dehumidification wheel 52, the heating mechanism, and the mechanical refrigeration mechanism to not operate; the heat pipe evaporator 41 cools the return air from the machine room, and the outdoor fresh air delivered by the first fan 51 cools the refrigerant in the heat pipe condenser 42 after being cooled by the spray device 54, thereby improving the heat exchange efficiency of the heat pipe condenser 42 and the heat pipe evaporator 41.

[0051] S600. If the first dry-bulb temperature is less than the real-time fresh air temperature and less than the second dry-bulb temperature and the real-time relative humidity is greater than the first relative humidity, the control device 24 controls the first fan 51, the spray device 54, the dehumidification wheel 52 and the heating mechanism to operate, and the mechanical refrigeration mechanism does not operate; the heat pipe evaporator 41 cools the return air from the machine room, and the outdoor fresh air delivered by the first fan 51 is first dehumidified in the working area of the dehumidification wheel 52 to reduce the relative humidity to 20%, and then cooled by the spray device 54 to cool the refrigerant in the heat pipe condenser 42; the heating mechanism heats the regeneration area of the dehumidification wheel 52. Specifically, since the mechanical refrigeration mechanism does not operate at this time, the outdoor fresh air is mainly heated by the hot water coil 62 in the heating mechanism. The hot water coil 62 heats the outdoor fresh air to 60°C and then outputs it to the regeneration area of the dehumidification wheel 52, heating the dehumidification wheel 52 to regenerate the dehumidification wheel 52 and restore the dehumidification capacity.

[0052] S700. If the real-time fresh air temperature is greater than the second dry-bulb temperature and the real-time relative humidity is less than or equal to the first relative humidity, the control device 24 controls the first fan 51, the spray device 54 and the mechanical refrigeration mechanism to operate, and the dehumidification wheel 52 and the heating mechanism do not operate; since the real-time fresh air temperature is greater than or equal to 10°C, relying solely on the heat pipe evaporator 41 for cooling cannot meet the air supply demand of the computer room, so the heat pipe evaporator 41 is used to pre-cool the return air from the computer room, and then the return air from the computer room is further cooled by the first evaporator 35 of the mechanical refrigeration mechanism; the outdoor fresh air delivered by the first fan 51 is cooled by the spray device 54 and then used to cool the refrigerant in the heat pipe condenser 42; in addition, a temperature detection device can be set in the computer room environment to detect the supply air temperature of the computer room, and the control device 24 adjusts the power of the compressor 31 according to the real-time supply air temperature of the computer room to reduce the working energy consumption of the refrigeration system.

[0053] S800. If the real-time fresh air temperature is greater than the second dry-bulb temperature and the real-time relative humidity is greater than the second relative humidity, the control device 24 controls the first fan 51, the spray device 54, the dehumidification wheel 52, the mechanical refrigeration mechanism and the heating mechanism to operate, and the heat pipe evaporator 41 and the first evaporator 35 of the mechanical refrigeration mechanism cool the return air from the machine room; the outdoor fresh air delivered by the first fan 51 is first dehumidified in the working area of the dehumidification wheel 52 to reduce the moisture content of the outdoor fresh air, and then cooled by the spray device 54 to cool the refrigerant in the heat pipe condenser 42; the heating mechanism heats the regeneration area of the dehumidification wheel 52. Specifically, the outdoor fresh air passes through the first condenser 32 of the mechanical refrigeration mechanism, recovers the heat of the first condenser 32, and the temperature rises. It is then heated by the hot water coil 62, and after being heated to 60°C, it enters the regeneration area of the dehumidification wheel 52 to desorb moisture from the adsorbent in the dehumidification wheel 52.

[0054] The control method of the indirect evaporative refrigeration system disclosed in the present application includes five working modes, which can adapt to different geographical environments and climates in various parts of my country, and can adapt to the climates of different seasons. Different working modes are selected according to different climatic environments, which can effectively ensure the heat exchange effect of the heat pipe evaporator 41 and the heat pipe condenser 42, thereby effectively reducing the working energy consumption of the mechanical refrigeration mechanism, that is, reducing the working energy consumption of the refrigeration system.

[0055] It is understandable that those skilled in the art can make equivalent substitutions or changes based on the technical solution and inventive concept of the present invention, and all such changes or substitutions should fall within the scope of protection of the present invention.

Claims

1. An indirect evaporative refrigeration system, characterized in that: The system comprises a first air duct, a second air duct, a power supply mechanism and a mechanical refrigeration mechanism, wherein the mechanical refrigeration mechanism comprises a first evaporator, a heat pipe evaporator and the first evaporator are arranged in the first air duct, a cooling and dehumidifying mechanism and a heat pipe condenser are sequentially arranged in the second air duct along the exhaust direction, and the cooling and dehumidifying mechanism is used to cool the refrigerant in the heat pipe condenser; the cooling and dehumidifying mechanism and the mechanical refrigeration mechanism are respectively electrically connected to the power supply mechanism; The cooling and dehumidifying mechanism can reduce the impact of humid air on the refrigeration system, and includes a first fan, a working area of a dehumidification wheel, and a cooling box arranged in sequence along the exhaust direction. A spray device is provided above the cooling box, and the cooling box is filled with PVC filler; the heat pipe condenser is provided on the exhaust side of the cooling box; the first fan, the spray device, and the dehumidification wheel are electrically connected to the power supply mechanism respectively; the power supply mechanism adjusts the working state of the dehumidification wheel and the spray device according to the real-time fresh air temperature and the real-time relative humidity; The device further comprises a third air duct, the mechanical refrigeration mechanism further comprising a first condenser, a heating mechanism and the first condenser being disposed in the third air duct, the regeneration zone of the dehumidification wheel being located in the third air duct, the heating mechanism being used to restore the dehumidification capacity of the dehumidification wheel; and the heating mechanism being electrically connected to the power supply mechanism. The heating mechanism includes a second fan, a hot water coil, and a water supply mechanism, wherein the second fan, the first condenser, the hot water coil, and the regeneration zone of the dehumidification wheel are sequentially arranged in the third air duct along the exhaust direction; the water supply mechanism is connected to the hot water coil, and the second fan is electrically connected to the power supply mechanism; The power supply mechanism includes a photovoltaic panel, a battery, and an inverter. The photovoltaic panel is connected to the input end of the battery, the output end of the battery is connected to the input end of the inverter, and the output end of the inverter is respectively connected to the first fan, the second fan, the spray device, the dehumidification wheel, the water supply mechanism, and the mechanical refrigeration mechanism; the water supply mechanism is used to recover heat from the photovoltaic panel; The water supply mechanism includes a water tank and a water supply pump. The water tank is used to recover heat from the photovoltaic panel. The water tank is connected to the hot water coil through the water supply pump. The water supply pump is electrically connected to the output end of the inverter.

2. The indirect evaporative refrigeration system according to claim 1, characterized in that: The mechanical refrigeration mechanism further includes a compressor, a liquid reservoir, an expansion valve and a gas-liquid separator, wherein the compressor, the first condenser, the liquid reservoir, the expansion valve, the first evaporator and the gas-liquid separator are connected end to end in sequence; The compressor is electrically connected to the power supply mechanism.

3. A control method for an indirect evaporative refrigeration system, characterized in that: The control method is used to implement the operation control of the indirect evaporative refrigeration system according to any one of claims 1 or 2, wherein the indirect evaporative refrigeration system further includes a temperature sensor for detecting the dry-bulb temperature of outdoor fresh air and a hygrometer for detecting the humidity of outdoor fresh air, and the power supply mechanism further includes a control device; the control method comprises the steps of: A first dry-bulb temperature, a second dry-bulb temperature and a first relative humidity are pre-set in the control device; The control device obtains the real-time fresh air temperature fed back by the temperature sensor; The control device obtains the real-time humidity fed back by the hygrometer and calculates the real-time relative humidity based on the real-time humidity; If the real-time fresh air temperature is less than or equal to the first dry-bulb temperature, the control device controls the first fan to operate, and the dehumidification wheel, spray device, heating mechanism and mechanical refrigeration mechanism do not operate; the heat pipe evaporator cools the return air from the machine room, and the first fan delivers outdoor fresh air to cool the refrigerant in the heat pipe condenser; If the first dry-bulb temperature is less than the real-time fresh air temperature and less than the second dry-bulb temperature and the real-time relative humidity is less than the first relative humidity, the control device controls the first fan and the spray device to operate, and the dehumidification wheel, the heating mechanism, and the mechanical refrigeration mechanism to stop operating; the heat pipe evaporator cools the return air from the machine room, and the outdoor fresh air delivered by the first fan is cooled by the spray device and then used to cool the refrigerant in the heat pipe condenser; If the first dry-bulb temperature is less than the real-time fresh air temperature and is less than the second dry-bulb temperature and the real-time relative humidity is greater than the first relative humidity, the control device controls the first fan, the spray device, the dehumidification wheel and the heating mechanism to operate, and the mechanical refrigeration mechanism does not operate; the heat pipe evaporator cools the return air from the machine room, and the outdoor fresh air delivered by the first fan is first dehumidified in the working area of the dehumidification wheel, and then cooled by the spray device to cool the refrigerant in the heat pipe condenser; the heating mechanism heats the regeneration area of the dehumidification wheel; if the real-time fresh air temperature is greater than the second dry-bulb temperature and the real-time relative humidity is less than the first relative humidity, the control device controls the first fan, the spray device and the mechanical refrigeration mechanism to operate, the dehumidification wheel and the heating mechanism do not operate, the heat pipe evaporator and the mechanical refrigeration mechanism cool the return air from the machine room; the outdoor fresh air delivered by the first fan is cooled by the spray device to cool the refrigerant in the heat pipe condenser; If the real-time fresh air temperature is greater than the second dry-bulb temperature and the real-time relative humidity is greater than the second relative humidity, the control device controls the first fan, the spray device, the dehumidification wheel, the mechanical refrigeration mechanism and the heating mechanism to operate, and the heat pipe evaporator and the mechanical refrigeration mechanism cool the return air from the computer room; the outdoor fresh air delivered by the first fan is first dehumidified in the working area of the dehumidification wheel, and then cooled by the spray device to cool the refrigerant in the heat pipe condenser; the heating mechanism heats the regeneration area of the dehumidification wheel.

4. The control method according to claim 3, characterized in that: The first dry-bulb temperature is 2° C., the second dry-bulb temperature is 10° C., and the first relative humidity is 30%.