数据中心自然冷却用泵驱动两相回路系统?分析

Exergy Analysis of Pump-driven Two-phase Loop System for Free Cooling in Data Centers

为了降低数据中心总能耗,本文提出了用于数据中心自然冷却泵驱动两相回路系统。基于稳流系统[火用]平衡方程,对系统进行了优化分析,建立了系统及主要部件的[火用]平衡模型,对3种工况下系统的[火用]和[火用]损进行了理论和实验对比,分析了各个部件的[火用]损变化趋势和[火用]损占比。结果表明:系统[火用]损占比最大的装置是蒸发器,高达40%以上,其次是冷凝器和泵,达到了25%左右,故在系统性能优化时,应依次考虑蒸发器、冷凝器和泵;对蒸发器和冷凝器优化可采取提高换热器的传热系数、增加传热面积、合理设定室内温度;对泵优化时,应尽量保证其热力学过程接近定熵过程。

To reduce the energy consumption in data centers,a pump-driven two-phase loop system was proposed for free cooling in data centers. Based on the exergy balance equation of a steady-flow system,the system was analyzed and optimized in this study,and exergy balance models of components for the system were established. The variation and distribution of exergy loss for both the system and every single component were compared theoretically and experimentally under three different working conditions. The results showed that the largest exergy loss was from the evaporator at over 40%. The next largest loss was that of the condenser and pump at approximately 25% each.The evaporator,condenser,and pump should be considered in sequence for system improvement. Improving the heat transfer coefficient,increasing the heat transfer area appropriately,and setting a reasonable indoor temperature could be performed for optimization of the evaporator and condenser. To optimize the pump,the pump compression should be as close as possible to isentropic compression.