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Experimental and Computational Multiphase Flow

Article Title

Review on air and water thermal energy storage of buildings with phase change materials

Authors

Yin Ma, National Centre for International Research of Low-Carbon and Green Buildings, Ministry of Science & Technology, Chongqing University, Chongqing 400045, China;Joint International Research Laboratory of Green Buildings and Built Environments, Ministry of Education, Chongqing University, Chongqing 400045, China
Yilin Luo, National Centre for International Research of Low-Carbon and Green Buildings, Ministry of Science & Technology, Chongqing University, Chongqing 400045, China;Joint International Research Laboratory of Green Buildings and Built Environments, Ministry of Education, Chongqing University, Chongqing 400045, China
Hongxiang Xu, National Centre for International Research of Low-Carbon and Green Buildings, Ministry of Science & Technology, Chongqing University, Chongqing 400045, China;Joint International Research Laboratory of Green Buildings and Built Environments, Ministry of Education, Chongqing University, Chongqing 400045, China
Ruiqing Du, National Centre for International Research of Low-Carbon and Green Buildings, Ministry of Science & Technology, Chongqing University, Chongqing 400045, China;Joint International Research Laboratory of Green Buildings and Built Environments, Ministry of Education, Chongqing University, Chongqing 400045, China
Yong Wang, National Centre for International Research of Low-Carbon and Green Buildings, Ministry of Science & Technology, Chongqing University, Chongqing 400045, China;Joint International Research Laboratory of Green Buildings and Built Environments, Ministry of Education, Chongqing University, Chongqing 400045, China

Keywords

phase change material, air-latent heat thermal energy storage system, water-latent heat thermal energy storage system, heat transfer enhancement

Abstract

With high energy consumption in buildings, the emissions of greenhouse gases are also increasing. It leads to some environmental problems. To realize resource conservation and environmental protection target, latent heat thermal energy storage systems (LHTES) are introduced into all kinds of buildings. A variety of air-LHTES and water-LHTES are analyzed in this study based on the heat transfer fluid medium adopted. The results of this study indicate that the air-LHTES uses the low-temperature ambient air to store cold during nighttime and releases cold during the daytime in summer vice versa in winter with auxiliary heat sources. The water-LHTES stores the cold and heat generated by various natural sources (solar energy, nighttime sky radiation, air conditioning condensate) through the water, and then releases the cold and heat to the buildings to reduce the energy consumption of the buildings. However, for some regions with extremely hot climate, the ambient temperature is still high during nighttime in summer. It is difficult to achieve cold storage of ambient air. Accordingly, other natural cold sources should be adopted for cooling in air-LHTES. Due to the cooling effect of nighttime sky radiation, water temperature in water-LHTES could be lower enough for cold storage. Thus, a combination system of water-LHTES and air-LHTES is recommended. In this system, cold storage is achieved by collecting low-temperature, and released by supplying cooling air. The proposed system can also achieve heat storage in winter by collecting solar energy, and release heat by supplying heating air.

Publisher

Tsinghua University Press

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