| 摘要: |
| 为了降低数据中心空调能耗并提高换热效率，本文提出一种应用于数据中心的流道结构为逆流和叉流结合的露点间接蒸发冷却与机械制冷复合空调，并搭建了实验台分别对干燥工况和高湿工况下回风温度为26 ℃和35℃的不同运行模式进行实验测试。实验结果表明:运行湿模式，当数据中心回风温度较低为26 ℃时，干燥工况下机组的湿球效率最高为97％；当数据中心,回风温度较高为35 ℃时，干燥工况下机组的湿球效率约为110％，高湿工况下机组湿球效率为99％；运行混合模式，干燥工况下露点间接蒸发冷却器的湿球效率约为120％，高湿工况下露点间接蒸发冷却器的湿球效率约为110％。由测试结果可知，露点间接蒸发冷却技术在干燥地区更加适用，中等湿度和高湿地区需辅助机械制冷，尤其当回风温度较低时，高湿工况蒸发冷却应用受限，必须辅助机械制冷达到送风要求，回风温度较高时，蒸发冷却可以减少机械制冷的使用时间。 |
| 关键词: 露点间接蒸发冷却 机械制冷 数据中心 湿球效率 |
| DOI： |
| 投稿时间：2019-12-05 修订日期：2020-07-20
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| 基金项目:“十三五”国家重点研发计划(2016YFC0700404),国家自然科学基金(51676145)资助项目,西安工程大学研究生创新基金(chx2019067)项目资助。 |
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| Experimental Investigation on Dew Point Indirect Evaporative Cooling System Combined with Mechanical Refrigeration for Data Center |
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He Hongxia1, Huang Xiang1, He Huaming2, Chu Junjie3, Sun Tiezhu1
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| (1.School of Urban Planning and Municipal Engineering， Xi' an Polytechnic University;2.AOLAN (Fujian)Industry Co.,Ltd.;3.Institute of Building Environment and Energy,China Academy of Building Research) |
| Abstract: |
| To reduce the energy consumption of air conditioning and improve heat exchange efficiency in data center, this paper proposes a composite air conditioning system combined dew-point indirect evaporative cooling, which involves a combination of counter-flow and cross-flow heat exchangers, with mechanical refrigeration. A test bench was built for the composite air conditioning system, and the system performances under dry conditions and high-humidity conditions with return air temperatures of 26 ℃ and 35 ℃were tested. The experimental results show that: (1) In the wet mode, when the return air temperature is lower than 26 ℃, the maximum wet-bulb efficiency of the unit under dry conditions is 97%; when the return air temperature of the simulated data center is higher than 35 ℃, the wet-bulb efficiency of the unit under dry conditions is approximately 110%, and the wet-bulb efficiency of the unit under high-humidity conditions is also 99%; (2) In the mixed mode, the wet-bulb efficiency of the dew-point indirect evaporative cooler under dry conditions and high-humidity conditions is approximately 120% and 110% respectively. The test results show that the dew-point indirect evaporative cooling technology is more suitable in dry areas, and auxiliary mechanical refrigeration is required in medium- and high-humidity areas. In particular, when the return air temperature is low, the effect of evaporative cooling under high-humidity conditions is limited and the auxiliary mechanical refrigeration is needed to meet the air supply requirements. When the return air temperature is high, evaporative cooling can reduce the time required for mechanical refrigeration. |
| Key words: dew-point indirect evaporative cooling mechanical refrigeration data center wet bulb efficiency |
