Design and test of evaporative condensation indirect evaporative cooling air conditioning unit

Abstract

In order to solve the problem of high energy consumption of air conditioning system in data center, a new type of indirect evaporative cooling air conditioning unit was designed, which combines evaporative cooling, evaporative condensation and mechanical refrigeration. Through the enthalpy difference laboratory, the performance of the prototype was tested by simulating different secondary and primary air volume ratios and different dry and wet working conditions. The results show that the optimal air volume ratio range of the unit is 2.2~2.4, the efficiency of the indirect evaporative cooling section is 72%, 61% and 53.45% in dry region, medium humidity region and high humidity region respectively, and the air supply temperature of the unit is about 24 ℃, which meets the air supply requirements of the data center room. The applicability analysis of the unit in three typical cities of lanzhou, Beijing and Shanghai in different climate zones shows that the cooling time of the unit in the three cities using natural cooling source accounts for 98%, 78% and 62% of the total operating hours of the year respectively, showing good applicability.

Keywords

• data center
• evaporative cooling
• evaporative condensation
• mechanical refrigeration
• energy consumption of refrigeration