Ameen, B. K., Al-Hadithi, M. B., & Fadhil, O. T. (2017). Heat Transfer Enhancement of Flat Plate Solar Collectors for Water Heating in Iraq Climatic Conditions. Nahrain University College of Engineering Journal, 18(2), 259-272. https://oldjournal.eng.nahrainuniv.edu.iq/index.php/main/article/view/187