In this paper, the energy performance comparison of single glass, double glass and a-Si semi-transparent PV module integrated on the Trombe wall facade of a model test room built in Izmir, Turkey has been carried out. The system has been operated during the days February 25-26th. The Computational fluid dynamics (CFD) analysis for two-dimensional model of 3 systems have been done for transient analysis. The temperature variations at certain nodes where the temperature probes are placed have been compared with the simulation results and are found in good agreement. This validates the simulation model. Thus, the change in electrical efficiency by surface temperature of the PV module has been interpreted and the electrical power rate of the PV module has been designated. This model will be used for optimization of the system in different climatic regions, locations and for different building typologies. This project aims to be a prototype and to become widespread throughout Turkey and the world as it is easy both to renovate existing buildings with these systems and to apply them to new ones. (C) 2012 Elsevier Ltd. All rights reserved.