Ali J. S. Alrafadi. An Investigation Of a Solar Water Heater Using a Double-Walled Absorbent Spherical Tank and Solar Gravity For Thermal Operation. aajsr. 2024;2(3):305-312. تاريخ الوصول ديسمبر 22, 2024. https://aajsr.com/index.php/aajsr/article/view/200