Yousefi, Masoud, and Misagh Moradali. “Thermodynamic Analysis of a Direct Expansion Solar Assisted Heat Pump Water Heater”. Journal of Energy in Southern Africa 26, no. 2 (June 23, 2015): 110–117. Accessed July 22, 2024. https://journals.assaf.org.za/index.php/jesa/article/view/2205.