Performance analysis of thermally controlled walls based on radiant reflective coating
To evaluate the energy-saving effect of heat-controlled walls based on radiant reflective coatings and to solve the problem of the lack of relevant evaluation systems,a transie2nt heat transfer model for walls is es-tablished to investigate the dynamic characteristics of wall temperature and heat flow under complex climatic alternating environments,as well as the role of radiant heat transfer as a heat regulator in the passive cooling process.In addition,a new evaluation model based on the heat flow and heat transfer coefficients of the walls is proposed for performance evaluation.The results show that under the condition of indoor air-conditioning,the external surface temperature of the thermally controlled wall decreases by 10.74％on average and the heat flow improves by 281.54％compared with the normal wall;in the hot summer and warm winter regions,the radiant reflective coating on the south side of the building has the best effect,and the coating can reduce the annual cold load of the building by 87.8 MJ/m2;in the hot summer and cold winter regions,radiant reflective coating on the west side of a building can reduce the total annual load of the building by 26.3 MJ/m2.The proposed performance evaluation index can characterize the heat transfer process and heat transfer characteris-tics of thermally controlled walls within one day,and then obtain the discounted heat transfer coefficient of the walls,which is important for guiding the actual building construction and reducing the total energy consump-tion of the whole building life cycle.
radiant reflective coatingsnumerical simulationdynamic characteristicsbuilding energy effi-ciencyevaluation index
万方数据
维普
