Experiment of direct radiant floor heating system with air-source heat pump

Develops a test platform for this system using refrigerant as direct heating medium and studies the operation performance, heating effect and its influencing factors, and economic rationality of the air-source heat pump. The results show that the inlet and outlet refrigerant temperature of the floor pipes and temperature difference keep stable; the floor surface temperature and indoor air temperature maintains at 26.5 ℃ and 21.8 ℃ respectively in Zhengzhou’s winter conditions, satisfactorily meeting the requirements of indoor thermal comfort; preheating time of this system is as short as about 80 minutes; the thermal insulation performance of building envelope, windowwall ratio and pipe spacing are important influencing factors of radiant floor heating effect; this system has better economic and environmental benefits.