【摘要】 为了降低数据中心的运行能耗,分离式热管冷却系统会根据实际负载降低风扇转速,造成换热性能的衰减.为了对低风量和低负载下分离式微通道热管的换热性能进行研究和分析,建立了适用于预测低风量下分离式微通道热管换热性能的一维稳态模型,并与试验结果对比,验证了模型的准确性,其最大预测平均偏差为6.3%.利用该模型研究了运行参数对分离式微通道热管的换热性能和数据中心热安全的影响.不同风量下,服务器排风温度从27℃上升至39℃时,系统换热量均有超过60%的提升;冷冻水供水温度从6℃提升至18℃会导致系统换热量最高下降41.8%.在200～1 400 m~3/h风量下,增加蒸发器和冷凝器的高度差可有效提升系统换热量和制冷剂质量流量,风量越大,换热量增长率越高.但在相同风量下,随着高度差的逐渐增大,换热量增长率逐渐降低.研究结果对分离式微通道热管在数据中心的设计优化和节能运行有一定促进作用.更多还原

【Abstract】 In order to reduce the energy consumption of data center, the micro channel separate heat pipe(MCSHP) would reduce the airflow rate according to the actual heating load, resulting in a reduce of thermal performance.In order to investigate and analyze the thermal performance of MCSHP under low airflow rate and heating load, a onedimensional steady-state model was established. Compared with the experimental results, the maximum average relative error of the result predicted by the established model was 6.3%. By using the established model, the effect of operation parameters on the thermal performance of MCSHP and thermal safety of data center were investigated. When the server exhaust air temperature increased from 27 ℃ to 39 ℃, the cooling capacity was increased by more than60% under the various airflow rates. When chilled water supply temperature increased from 6 ℃ to 18 ℃, the cooling capacity was decreased by a maximum of 41.8%. The cooling capacity and refrigerant mass flow rate increased with the increasing height difference between evaporator and condenser under airflow rate ranged from 200 to 1 400 m~3/h,and the growth rate of cooling capacity increased with the airflow rate. However, the growth rate of cooling capacity decreased with the height difference under the same airflow rate. Those results give a guidance to improve the design optimization and energy-saving operation of the application of MCSHP in data center.更多还原