Liquid circulating heat recovery system is a form of air-conditioning exhaust heat recovery system,which can recover energy from the exhaust to reduce the energy consumption of fresh air,and is widely used in high-grade hotels,hospital buildings and clean production wor...MORE Liquid circulating heat recovery system is a form of air-conditioning exhaust heat recovery system,which can recover energy from the exhaust to reduce the energy consumption of fresh air,and is widely used in high-grade hotels,hospital buildings and clean production workshops.This paper introduces the working principle o...