Kaewpradap, A., N. Ohnjaikla, and S. Sanitjai. 2018. “Investigation of Load Variations With Seasonal Conditions Affected to Coefficient of Performance of Air to Water Heat Pump”. Journal of Research and Applications in Mechanical Engineering 4 (2):175-82. https://ph01.tci-thaijo.org/index.php/jrame/article/view/138658.