湖水源数据中心余热回收系统性能模拟研究——以东江湖大数据产业园为例

Simulation on Performance of Waste Heat Recovery System with Lake Water in Data Centers:A Case Study of Dongjiang Lake Data Center Park

为充分利用湖水源数据中心无主机全自然冷却系统的余热、降低废热对自然水体的影响,基于夏热冬冷地区办公建筑动态负荷特性,建立了移峰填谷策略下数据中心水源热泵联合蓄热水箱余热回收系统,与传统风冷热泵供热、水源热泵余热回收系统对比,研究其节能降费潜力。模拟表明:与传统风冷热泵供热相比,水源热泵余热回收供热节能率为46.1%;通过增设蓄热水箱,制定峰谷电价下的运行策略,供热系统节能率提高了41.9%。此外,从冷却水回水侧回收余热有利于提升冷却系统能效,机房送风温度23℃,供水温度17℃时,通过余热回收,冷却系统能耗降低13.1%,机房能源使用效率(power usage effectiveness,PUE)由1.131降至1.111。通过经济性分析发现,相比于风冷热泵供热,水源热泵余热回收全年电费节费率为19.7%,在移峰填谷策略下,与水源热泵余热回收相比节费率进一步提高了64.4%,节能降费效果显著。

In order to make full use of the waste heat from lake water free cooling system in data center and reduce the impact of waste heat on the natural water,a waste heat recovery system under the peak shifting and valley filling strategy was established.The system consists of a water source heat pump combined with a thermal storage tank.Based on the dynamic load characteristics of office buildings in hot summer and cold winter areas,the system was compared with the air-cooled heat pump heating system and waste heat recovery system of water source heat pump to analyze its energy saving and cost reduction potential.Simulation shows that compared with traditional aircooled heat pump heating systems,the energy saving rate of the water source heat pump system is 46.1%.By installing additional heat storage tanks and developing operating strategies under peak and valley electricity prices,the heating system's energy efficiency is increased by 41.9%.In addition,recovering waste heat from the cooling water return side helps to improve the energy efficiency of the cooling system.When the air supply temperature is 23℃and the water supply temperature is 17℃,the cooling system's energy consumption is reduced by 13.1%through waste heat recovery.And the power usage effectiveness of the data center decreased from 1.131 to 1.111.Through economic analysis,it is found that the annual electricity saving rate of waste heat recovery system is 26.5%compared to the air-cooled heat pump heating systems.Under the peak load shifting and valley filling strategy,the saving rate is further increased by 64.4%compared with the water source heat pump waste heat recovery system,which significantly affects energy saving and cost reduction.