S. Al dabbagh, Maan, معن, Dr. Ghalib Y. kahwaji, and دكتور. 2005. “Preliminary Investigation of the Economics of the Stratified Integrated Collector – Storage Domestic Hot Water System in Iraq”. Al-Rafidain Engineering Journal (AREJ) 13 (2):29-38. https://doi.org/10.33899/rengj.2005.45604.