数据机房基于平板微热管阵列的自然冷能换热器性能研究

The Characteristic of Air-water Heat Exchanger Based on Micro Heat Pipe Array Applied in Data Center

针对数据机房内空调系统全年不间断运行导致的高能耗问题,本文将平板微热管阵列与多孔通道平行流管有效结合,设计了新型室内侧微热管阵列式气-水换热器末端,在冬季或过渡季节利用自然冷能对数据机房整体环境散热降温。实验利用多功能气候实验室模拟机房28℃室内环境温度,对换热器在不同供水温度、水侧流量及风量下的换热性能及阻力特性进行了研究。结果表明,实验条件下换热器最大换热量为8.79 k W,空气侧最大阻力为252.6 Pa,水侧最大阻力为8.79 k Pa。风量以及冷热流体的进口温差为影响换热器性能的主要因素。采用传热单元数法(ε-NTU)得到换热器最大效能达到85.8%。当冷热流体进口温差较大(> 20℃)时,系统平均等效能效因子τ值大于19,当温差较小(8℃左右)时,系统平均等效能效因子τ保证在7.8以上。将本文换热器与采用百叶窗翅片形式的板翅式换热器的传热因子j和摩擦因子f进行了对比分析,换热器的综合性能评价指标j/f^1/2提升了10.47%。该换热器具有良好的传热性能及较小的阻力特性,为其在数据机房的应用提供了依据。

According to the high energy consumption of air conditioning system in data center throughout the year,this research proposed a new type of indoor air-water heat exchanger( AWHE) based on micro heat pipe array( MHPA) and parallel flow tube,in order to use natural cold energy.Enthalpy Potential Method Laboratory is used to simulate the indoor temperature of data center at 28 ℃,the performance of AWHE under different inlet water temperature,air and water ow rate were separately investigated.Results showed that the temperature difference from air side to water side and the air flow rate are the main factors affecting the performance of AWHE.The maximum efficiency of MHPA-AWHE is 85.8% by using the method of( ε-NTU).During the experiment,the maximum heat transfer is 8.79 kW.The maximum resistance of air side and water side is 252.6 Pa and 8.79 kPa,respectively.When the inlet temperature difference is larger than 20 ℃,the factor τ is greater than 19;when the temperature difference is about 8 ℃,the system average factor τ is always above 7.8.The heat transfer factor jand friction factor f of the micro heat pipe array heat exchanger with serrated fins and the plate fin heat exchanger with louver fins are compared and analyzed.The comprehensive performance evaluation index j/f^1/2 is increased by10.47%.The good heat transfer performance and small resistance characteristics provides a basis for the application of MHPA-AWHE in the data center.