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Indirect Evaporative Cooling for Data Centers

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Indirect Evaporative Cooling for Data Centers

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Indirect evaporative cooling for data centers is a green energy-saving technology that uses water evaporation to absorb heat for cooling.

Principle of indirect evaporative cooling for data centers

The direct contact between air and water is used, and the latent heat of evaporation of water is used for refrigeration.

Compared with direct evaporative cooling, indirect evaporative cooling is that the working air and circulating water are in direct contact with each other on the side of the wet channel and are enthalpy cooled, and then indirectly take away the heat in the air through the heat exchanger, thereby achieving the purpose of controlling the air. The effect of isohumidity and cooling.

The working air is mostly outdoor fresh air, and the used air is mostly hot return air in the computer room. With the sensible heat temperature difference between the two as the driving force, the heat of the server is transferred to the outdoor air through the heat conduction of the pipe wall, thereby cooling the data center return. The purpose of the wind.

 

Indirect Evaporative Cooling for Data Centers

 

Mode of indirect evaporative cooling for data centers

Indirect evaporative cooling technology is often used in data centers with mechanical refrigeration equipment as an auxiliary. According to different outdoor meteorological parameters, the unit switches to three operating modes: dry mode, wet mode, and mixed mode.

1. Dry mode

In winter, when the outdoor dry bulb temperature is low, the unit turns on the dry mode. At this time, the spray evaporation system and the mechanical refrigeration system are not running. The low-temperature outdoor air enters from the secondary air inlet, enters the indirect evaporative cooling heat exchange core for heat exchange, and is then discharged through the secondary exhaust fan; the high temperature return of the data center The wind enters the unit through the primary air inlet, flows through the indirect evaporative cooling heat exchange core, is directly cooled by outdoor low-temperature air, and is sent into the data equipment room by the primary air blower.

Dry mode: In dry mode, the heat exchange efficiency of the indirect evaporative cooling core can generally reach 60%.

2. Wet mode

During the transition season between spring and autumn, when the external ambient temperature is mild and the relative humidity is not high, the unit operates in wet mode. At this time, the spray evaporation system is operating, but the mechanical refrigeration system is still not operating. The water distributor on the upper part of the core distributes water to the wet channel of the core. After the outdoor fresh air enters the core, it is directly evaporated and cooled by enthalpy cooling on the inner surface of the wet channel, and then indirectly contacts the return air of the machine room to take away its heat. Finally, it is evaporated from the secondary air. Exhaust air outlet. The higher-temperature return air of the data center first flows through the primary air inlet through the plate-fin indirect evaporative cooler to exchange heat with the outdoor fresh air that has been directly evaporated and cooled. The cooled data center return air is sent to the data by the primary air supply fan. engine room.

Wet mode: In wet mode, the heat exchange efficiency of the indirect evaporative cooling core can generally reach 70%.

3. Mixed Mode

In hot summer, when the outdoor dry temperature bulb temperature is high and only turning on the evaporative cooling section cannot meet the cooling capacity requirements, the unit operates in hybrid mode. At this time, the spray evaporation system and the mechanical refrigeration system operate at the same time to achieve the required cooling capacity. The water distributor on the upper part of the core distributes water to the wet channel of the core. After the outdoor fresh air enters the core, it is directly evaporated and cooled by enthalpy cooling on the inner surface of the wet channel, and then indirectly contacts the return air of the machine room to take away its heat. Finally, it is evaporated from the secondary air. Exhaust air outlet. The higher-temperature return air in the data center first flows through the primary air inlet through the plate-fin indirect evaporative cooler to exchange heat with the outdoor fresh air that has been processed by direct evaporative cooling. The return air in the data center is pre-cooled and then cooled by the evaporator. , the cooled data center return air is sent into the data equipment room by the primary air blower, and the cycle continues.

Mixed mode: When the outdoor air wet bulb temperature is greater than 19°C, mechanical refrigeration is turned on for assistance.

 


 

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