分离式微通道热管低风量下换热性能模拟研究.pdfVIP

分离式微通道热管低风量下换热性能模拟研 究 作者：张泉黄茜邹思凯 来源：《湖南大学学报·自然科学版》2020年第11期 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 m3/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. 关键词：热管;微通道;模拟;传热 中图分类号：TU831.6 文獻标志码：A Numerical Investigation on Thermal Performance of Micro Channel Separate Heat Pipe under Low Airflow Rate ZHANG Quan ，HUANG Xi ，ZOU Sikai （College of Civil Engineering，Hunan University，Changsha 410082，China） 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 one-dimensional 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 than 60% 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 m3/h，and the growth rate of cooling capacity increased wit