열역학 제2법칙, 히트펌프(Heat Pump) 냉동시스템과 성적계수 개념을 아주 쉽게 알려드립니다 ^^ [앤딩] Song : SYD - Submarine Follow Artist : https://bit.ly/3tjvqGi Music promoted by DayDreamSound : https://bit.ly/3yAtj34