급탕유닛이 적용된 캐스케이드 멀티히트펌프의 성능특성 연구

Multi-heat pump system has been widely adopted in buildings due to its higher energy efficiency. Recently, additional demand for hot water supply has been increased in commercial and residential buildings. Therefore, the inclusion of a water heating function into the multi heat pump has been proposed to save energy by eliminating the need for a boiler to provide hot water supply. In this study, a cascade multi-heat pump, combining a multi-heat pump using R410A for air heating with a water heating unit using R134a for hot water supply, was investigated experimentally. The performance of the cascade multi-heat pump was measured by varying the refrigerant charge amount and water inlet temperature. Test results were compared with those of a single-stage multi-heat pump using R410A for air and water heating.