回路热管微通道换热器蒸发冷却实验

Evaporative cooling experiment of microchannel heat exchanger in loop heat pipe

采用微通道换热器作为数据中心回路热管冷却换热器,在微通道冷凝器侧进行了蒸发冷却实验。实验利用焓差平台测量了不同因素对采用蒸发冷却技术的微通道冷凝器换热影响,并分析了室内外不同温差、室外不同湿度条件下采用蒸发冷却的微通道冷凝器及蒸发器的进出口空气温差。实验结果表明:采用蒸发冷却可使冷凝器入口空气温度实现大幅温降,并增加冷凝器及蒸发器的进出口空气温度差值,喷淋后可使流经热管空气降温0.3～1.9℃,增大2%～20%的系统换热量,冷凝器换热效率得以提升,并可扩大回路热管换热器使用地区,延长回路热管年利用时间。

The microchannel heat exchanger is applied as the heat exchanger of the loop heat pipes in data center,and the evaporative cooling experiment is carried out on the side of the microchannel condenser.The influence of evaporative cooling on the microchannel condenser is measured by using the enthalpy difference chamber in the experiment,and the temperature difference between the inlet and outlet air of the microchannel condenser and evaporator with different indoor and outdoor temperature and humidity was analyzed.The experimental results show that evaporative cooling can make the condenser inlet air temperature achieve a large temperature drop and increase the temperature drop of the inlet and outlet air,while the spraying can cool the air through the heat pipe about 0.3-1.9℃ and increase about 0.1-0.6kW heat transfer of the system.Moreover,the evaporative cooling capacity of microchannel condenser and evaporator increases with the increase of indoor and outdoor temperature difference,and decreases with the increase of outdoor relative humidity.Compared with single heat pipe air conditioning,loop heat pipe with evaporative cooling in data center can make better use of natural cooling energy,prolong the utilization time of air conditioning system in a year,and expand the application area of the system.