Abstract: An analysis has been performed based on reference (9) to determine the characteristics of heat transfer numerically for a double-enveloped structure consisting of double-glass and mass wall with opened edges and different declination angles of the wall. The decritiza-tion method of Spalding-Patankar's was adopted for solving the equations of mass, momentum, and energy. The heat transfer results were obtained for the declination angles of the wall from 10 to 90 degrees. The results were compared with the data of experiments.