Investigation on air-conditioning load profile and energy consumption of desiccant cooling system for commercial buildings in Hong Kong
Investigation on air-conditioning load profile and energy consumption of desiccant cooling system for commercial buildings in Hong Kong
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DOI：
10.1016/j.enbuild.2012.02.051
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发表时间：
2012-06
影响因子：
6.7
通讯作者：
Ronghui Qi;Lin Lu;Hongxing Yang
中科院分区：
文献类型：
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作者：
Ronghui Qi;Lin Lu;Hongxing Yang
在香港，传统的空调系统能耗高，室内热舒适性差。本文调查了当地三个典型商业建筑，即写字楼、酒店和零售店的空调负荷分布，并对这些建筑的液体除湿制冷系统的能耗进行了考察。模拟结果表明，冷负荷占年总负荷的98%以上，3~9月潜在负荷比例较高。热舒适性差的主要原因是再采暖率过高，即60%~90%。因此，提出了可分别处理显性负荷和潜在性负荷的最不发达国家。然而，电力驱动的最不发达国家被发现不适合当地商业建筑。当太阳能集热器的安装面积超过最低要求，即办公室9.7m2/(kwm−2)和酒店建筑12.7m2/(kwm−2)时，具有蓄热功能的太阳能辅助最不发达国家系统可显著节省能源。并对不同系统类型、不同安装面积的节能效果进行了研究。太阳能辅助的最不发达国家在冬季表现出更多的节能效果，但在夏季表现得更少。研究结果和结论可供研究人员和当地工程师参考。
In Hong Kong, conventional air-conditioning (AC) systems cause a high energy consumption and poor indoor thermal comfort. This paper investigated the AC load profiles of three typical local commercial buildings, i.e. office, hotel and retail, and examined the energy consumption of liquid desiccant cooling system (LDCS) for these buildings. Simulation results showed that the cooling load contributed to more than 98% of total annual load, with high latent load proportion from March to September. The high reheating ratio, i.e. from 60% to 90%, is found to be the main reason for the poor thermal comfort. Therefore, the LDCS which could handle sensible and latent loads separately was proposed. However, the electricity-driven LDCS was found not suitable for local commercial buildings. significant energy saving could be achieved by the solar-assisted LDCS system with thermal storage, when the installation area for solar collectors is larger than the minimum required one, i.e. 9.7m2/(kWm−2) for office and 12.7m2/(kWm−2) for hotel buildings. Energy saving of different system types with different installation areas was also studied. The solar-assisted LDCS shows more energy saving in winter but less in summer. Results and conclusions can be useful for researchers and local engineers.