Dynamic Indoor Temperature Prediction And Energy Consumption Analysis Of Passive Solar Building

It is important to reduce building energy consumption because it accounts for large percents of social overall energy consumption, and passive solar buildings as a kind of sustainable buildings have big potentials. However, indoor air temperaturein this kind of building can't meet people's comfort requirement while the outdoor environment varies, so auxiliary heat resource is needed. The precondition that ensures the reasonable auxiliary heat source is the correct information of the dynamic indoor temperature and heat load under ambient conditions.This study sets up a model for predicting room temperature and heat load of the buildings with solar air collector in winter. Heat supply of the solar air collector and indoor thermal environment of the buildings with different solar air collectors are analyzed using the model and its program. The effect of solar radiation on the heat supply of the solar air collector is greater than outdoor air temperature. The indoor temperature of the buildings with solar air collector is better than the traditional energy saving buildings, the mean room temperature difference between two buildings is 8℃. The building with solar air collector has cooling load during 10:00am-4:00pm on fine day, the average daily storaged heat quantity is 760kW/m~2, 38% of the average daily overall heat load. Its month-average heat load is only 23 W/m~2, while that of the 65% energy saving buildings is 45 W/m~2, and the energy saving ratio is 48.9%.Meanwhile, the life cycle energy use of the buildings with solar collector is also analyzed in this study. The overall energy use of the buildings with solar collector and the 65% energy saving buildings are 15549.8MJ/m~2 , 28019.7 MJ/m~2 respectively during their 50 years life-span. The energy use for heating is the largest part. Compared with the low energy buildings in America and Sweden, the life cycle energy use of the Chinese 65% energy saving buildings is still larger. Life cycle evaluation is needed for building energy saving.The results from this study offer some important information for passive solar building design, and have great significances and application value for developing passive solar buildings.