Optimum insulation thickness of external walls for energy saving

Most of energy is used up to space heating in the cold regions of Turkey. Insulation in external walls of buildings has been gaining much more interest in recent years not only for the environmental effect of the consumed energy but also the high cost of the energy. Therefore, the optimum insulation thickness was investigated in this study for the coldest cities of Turkey like Erzurum, Kars and Erzincan. The optimization is based on the life cycle cost analysis. As a result considerable energy saving is obtained when the optimum insulation thickness is applied. Savings up to 12.113 $/m2 of wall area can be maintained for Erzurum.