Author(s): ZHANG Jusong, WANG Shanshan, WANG Jianchun, School of Materials Science and Engineering, Shenyang Jianzhu University, Xinyang Tianyi energy-saving technology Co., Ltd.
Pages: 500-506
Year: 2015 Issue:  3
Journal: Journal of Shenyang Jianzhu University(Natural Science)
Keyword:  phase change material; thermal resistance; warming-up rate; content; heat transfer coefficient; energy-saving effect;
Abstract: The aim of this paper is to study heat transfer coefficient of the wall,where the phase change material( PCM) is applied in its inside. The loss rate of heat transfer coefficient as an evaluation index was proposed for examining energy saving effects of the wall. According to energy-saving features of PCM,a system for testing and measuring was built. Using the method of variable temperature,the heat transfer coefficient of composite wall was measured. And energy-saving effects of the phase change wall were discussed by tests of warming-up,constant temperature and Kcooling. A calculating formula for energy saving β=K基准-K实测K基准×100% was given. It is found that with increase of the wall thermal resistance and the content of PCM,in the case of a small rate of warming-up,energy saving effects is 25 mm,the warming-up rate is 1. 3 ℃ / h,the maximum energy saving effect is achieved. In compassion with the benchmark wall which has energy saving rate 50%,the phase change wall can further save energy 38. 2%. Conclusion is that the proposed energy conservation performance evaluation index of the wall is reliable. Energy saving effects of the wall are closely related to the thermal resistance,warming-up rate and the content of PCM.When the thermal resistance is large,the warming-up rate is small and the content of phase change is high,good energy saving effects can be achieved.