藏区数据中心蒸发冷却与余热回收系统应用探讨
Discussion on application of evaporative cooling and waste heat recovery systems to Tibetan data centers
摘要：
近年来，藏区数据中心产业发展迅速，其能耗和全年产生的热量亦大规模增长。为提高数据中心能源利用效率，本文以西藏拉萨市某数据中心为研究对象，通过对其一期工程空调系统进行实测分析，建议在二期工程建设中采用热回收型蒸发冷却空调系统。采用焓差实验室模拟藏区室外条件，对机组性能进行了测试，并针对系统的节能性和经济性进行了计算分析。结果表明：该机组蒸发冷却模式下填料最佳淋水密度为1 800 kg/(m2·h)，最佳运行风速为2.4 m/s；虽然藏区低大气压力有利于提高机组直接蒸发冷却效率，但机组实际制冷量受到较大影响。机组热回收模块的实验测试结果表明，在机房机柜装机率为100%时，热回收量最高可达264.78 kW，具有显著的节能性和经济性。
Abstract：
In recent years, the data center industry in Tibetan area has developed rapidly, and its energy consumption and annual heat generation have also increased on a large scale. In order to improve the energy utilization efficiency of data centers, this paper takes a data center in Lhasa, Tibet as the research object, and through the actual measurement and analysis of the air conditioning system of the first phase of the project, it is proposed to adopt the heat recovery type evaporative cooling air conditioning system in the construction of the second phase project. The enthalpy difference laboratory is used to simulate the outdoor conditions in the Tibetan area, the performance of the unit is tested, and the energy saving and economy of the system are calculated and analysed. The results show that the optimal water filling density is 1 800 kg/(m2·h) under the evaporative cooling mode of the unit, and the optimal operating wind speed is 2.4 m/s. Although the low atmospheric pressure in Tibetan area is beneficial to improve the direct evaporative cooling efficiency of the units, the actual cooling capacity of the units is greatly affected. The experimental test results of the heat recovery module of the unit show that when the installation rate of the cabinet in the computer room is 100%, the maximum heat recovery capacity can reach 264.78 kW, which has significant energy saving and economy.
Keywords:Tibetan area; data center; direct evaporative cooling; waste heat recovery; energy saving analysis