Trinuruk, P., Chumnanwat, S., Prempreesuk, S., Pasanta, S., & Sanitjai, S. (2018). Performance improvement of 5-kW household air-to-water heat pump. Journal of Research and Applications in Mechanical Engineering, 4(1), 116–125. retrieved from https://ph01.tci-thaijo.org/index.php/jrame/article/view/139087