数据中心用板翅式间接蒸发冷却器二/一次风量比的试验研究

Experimental study on secondary/primary air volume ratio of plate-fin indirect evaporative cooler used in data center

为了研究数据中心间接蒸发冷却器二/一次风量比对其换热性能的影响,搭建了数据中心用板翅式间接蒸发冷却试验台,并进行了测试分析,结果表明:干模式下,机组风量比从0.8逐渐增至1.8的过程中,冷却器换热效率提升明显,3种工况下的最佳换热效率分别为59.6%,55.4%,54.2%,最佳二/一次风量比为1.5;湿模式下,随着二/一次风量比的逐渐增大,一次空气的出风温度逐渐降低,换热效率显著提高。在乌鲁木齐、西安、南京工况下的最佳二/一次风量比分别为1.4,1.4,1.5,换热效率可达68.42%,66.35%,65.28%。由于干、湿模式下换热驱动势的差异,湿模式下的最佳风量比小于干模式,且随着二次空气进口湿球温度的升高,其最佳二/一次风量比也随之增大。最佳风量比的确定也不一定是设备热交换效率最高的状态点,要综合考虑由于二次空气流量增大引起的风机能耗问题。

In order to study the influence of secondary/primary air volume ratio on the heat transfer performance of indirect evaporative cooler in data center,a plate-fin indirect evaporative cooling test bed was built for data center.The results show that in the dry mode,when the unit air volume ratio gradually increases from 0.8 to 1.8,the heat transfer efficiency of the cooler is improved significantly.The optimal heat transfer efficiency under the three working conditions is 59.6%,55.4%and 54.2%respectively,and the optimal secondary/primary air volume ratio is 1.5.In wet mode,with the gradual increase of the secondary/primary air volume ratio,the air outlet temperature of the primary air decreases gradually,and the heat transfer efficiency increases significantly.The optimal secondary/primary air volume ratio under the working conditions in Urumqi,Xi'an and Nanjing is 1.4,1.4 and 1.5,respectively,and the heat transfer efficiency can reach 68.42%,66.35%and 65.28%,respectively.Due to the difference of heat transfer driving potential between dry and wet modes,the optimal air volume ratio in wet mode is smaller than that in dry mode,and with the increase of wet-bulb temperature at the secondary air inlet,the optimal secondary/primary air volume ratio also increases.The determination of the optimal air volume ratio is not necessarily the state point of the highest heat exchange efficiency of the equipment.The energy consumption of the fan caused by the increase of secondary air flow should be considered comprehensively.