Taking a typical residential building of Urumqi as the research object, it established building model using the software of Sketch Up. Solar radiation heat gain entering houses through the building envelope was simulated by the Energy Plus. Compared with indoor hourly thermal load index, it indicated making full use of the solar radiation would reduce thermal load. It concluded that solar radiation heat gain in the house facing south is higher than indoor hourly thermal load index during the certain period of the noon in heating down times. Improving thermal insulation properties of walls, opt...
