数据中心混合工质氟泵自然冷却系统性能分析

Thermal performance of refrigerant pump-driven free cooling system for data centers with mixed refrigerant

氟泵自然冷却技术可有效降低数据中心的冷却能耗,但单一工质系统在面对全年大温差跨度、多循环工作模式的情境下,难以满足数据中心动态高效运行的需求。为了进一步提高自然冷源利用率和氟泵系统能效,搭建了数据中心自然冷却用混合工质氟泵冷却系统实验装置,研究多种不同工况下R410A混合工质系统的性能。结果表明:系统制冷量和能效比ε均随冷热源温差的增大而增大;在泵频率5~30 Hz范围内,系统换热量先增加后略有下降,之后趋于平缓,峰值出现在10~15 Hz,而单一工质R22的峰值频率为25 Hz。

Refrigerant pump-driven free cooling technology can effectively reduce data center cooling energy consumption.But for a pure refrigerant system,it is difficult to meet the need of dynamic high efficient operation facing both the large temperature difference range and multiple operating modes yearly.In order to improve the energy efficiency of the system and the utilization of free cooling source,an experimental system of refrigerant pump-driven free cooling for the data center was built up.The thermal performance of the system charged with R410A mixed refrigerant was tested and analyzed under different working conditions.The results show that the cooling capacity and EER of the system increases with the increasing of the temperature difference between cold and heat sources.The cooling capacity increases firstly and then decreases slightly,then changes little within the pump frequency range of 5~30 Hz.The pump frequency for maximum cooling capacity occurs in the range of 10~15 Hz for R410A system,which is 25 Hz for R22 system.