Experimental study on air source heat pump coupled capillary floor radiant heating

In the process of global energy sustainable development, increasing the utilization of renewable energy in buildings and constructing zero-carbon buildings has be-come one of the important ways to alleviate global warming. In this situation, air source heat pumps are widely used because of its energy saving and stable performance. Air source heat pump coupled capillary floor radiant heating uses refrigerant as a heat transfer medium to directly heat the room floor, with no pump consumption and secondary heat transfer loss. In order to better study its temperature and heating characteristics under different capillary spacing and different outdoor temperature, an air source heat pump coupled capillary floor radiant heating experimental device was built in the artificial environment control room. The results show that the smaller the capillary spacing, the greater the vertical temperature difference of the floor. When the outdoor ambient temperature is ?5? and the capillary spacing is 80 mm, the vertical temperature difference is 2.3?, the surface temperature difference at different horizontal positions is 0.8?, and 6.4? from the compressor discharge section to the condensate outlet section. The heating capacity and heating COP of the system are maintained at about 1.99 kW and 3.85, respectively.