Study Of Indoor Thermal Environment With Heat Charge And Discharge Characteristic Of Massive Wall

With standard of living improved, Building energy consumption is confronted with enormous challenge. Decreasing the use of conventional energy, reducing engngy consumption of heating/cooling load and exploiting and mutilating renewable energy have become an important stratagem for the sustainable development. Passive solar building is a low energy building which can use effectively solar energy for heating or cooling. It has already been proved that passive solar building can greatly reduce energy consumption of heating/cooling. Thermal mass, which is indispensability for passive solar building, is in effect on tempering indoor air temperature and improving indoor environment comfort and is given more and more attention.However, most of the research on thermal mass in passive solar building is focus on thermal performance. Theoretically, massive wall should include other orientation walls, floor and ceiling, but the study about them is little. Therefore, the effect of the heat charge and discharge characteristic of walls on indoor thermal performance will be discussed in this paper. The result could be used as a reference to the design of passive solar homes. It is meaningful for developing and spreading the utilization of solar homes.Firstly, the paper studied thermal storage performance of massive wall in passive solar houses in winter and the effect of massive wall with shading and ventilation on reducing indoor temperature in summer through experiments. The conclusion is: with insulation, the inside surface temperature of massive wall is mostly influenced by the indoor thermal environment, the time delay of massive wall is about 1～2 hours and the difference between high-mass and light-mass building is little; the temperature phase shift induced by massive wall without insulation is 3～9 hours, it is help to steady the indoor temperature fluctuate, but heat loss at nighttime is great; with well insulation, the orientation of massive wall has little effect on the heat transfer process; the passive solar house with high mass can increase the indoor air temperature by 1～5℃ in winter and reduce it by 1～2 ℃ in summer; massive wall with shading and ventilation can prevent 82% solar energy in summer, and can more reduce indoor air temperature by1～2℃.Secondly, a mathematical model which can predict the heat charge and discharge characteristic of massive wall is proposed and the solution is also presented. Experiments have been done and satisfactory correlation was obtained. Base on this model, the influence of wall's thermophysical properties under difference weather condition on heat charge and discharge characteristic is discussed, the effect of thermal capacity and thickness of thermal mass with difference thermal...