Applied Research On Phase Change Materials With Climate Adaptive Design Strategy In Buildings In Xiamen

In recent decades,with the increasing economic level of China and the rapid development of society,the demand for energy has also grown by a geometric trend in our country.Meanwhile,the proportion of energy supply required by the construction industry in total energy consumption is quite large.The building energy conservation has increasingly become a consensus in the process of development.This paper focuses on the applicability of phase change material(PCM)construction applications in Xiamen to improve the regional application.In addition,we can take advantage of the climate adaptive design strategies to accelerate or slow down heat storage and heat release rate of PCM,which can maximize indoor comfort,reduce indoor temperature fluctuations and improve building energy efficiency.Firstly,this paper makes a simple analysis of the relevant basic theory of phase change material,and systematically summarizes the PCM application research and practical case,which is divided into 2 major categories of envelope structure and construction equipment.Secondly,this paper explores the appropriate climate adaptive design strategies for buildings in Xiamen by climate data,psychrometric chart,and climate adaptive design strategies of existing buildings.Lastly,The paper used Designbuilder software to simulate in order to confirm the effect of PCM in Xiamen.According to result of the simulation,the preferred phase change roof structure in Xiamen is inverted roof.The best phase transition temperature is 28℃ and the optimum thickness is 30mm.Compared with the ordinary roof,the energy saving ratio is 2.25%.The most suitable climate adaptive design strategy is to increase the variable sunshade,which energy saving ratio is 31.8%(14 times better).Energy saving per unit area of material reached 15.73 KWh/m2。Also,the indoor maximum temperature and average temperature of the phase change roof combined with the variable sunshade can be reduced by 1.2℃ and 0.84℃ on a typical summer day.The phase change wall is preferably constructed on the inner side of the wall.The best phase transition temperature is also 28℃ and the optimum thickness is 30mm.Compared with the ordinary wall,the energy saving ratio is 2.6%.The most suitable climate adaptive design strategy is to increase night natural ventilation,which energy saving ratio is 6.7%(3 times better).Energy saving per unit area of material reached 5.54 KWh/m2.Also,the indoor maximum temperature and average temperature of the phase change wall combined with the night natural ventilation can be reduced by 0.31℃ and 0.19℃ on a typical summer day.The data show that the optimal form of phase change materials for building applications in Xiamen is phase change roof combined with variable sunshade,followed by phase change roof combined with fixed sunshade,and phase change wall combined with night natural ventilation.