Experimental study on combined solarassisted heat pump and radiant floor heating systems

Experimentally studies the performance of the combined system and compares the economics of the system with those of oil boiler and gas boiler centralized heating systems. The experimental result shows that the efficiency of the heatpipe vacuumtube heat collector is 644%， while that of the Utype vacuumtube heat collector is 59%， and the EER of the heat pump is 308; the time of indoor temperature rising is lagged about 3 hours relative to the unit heating time， which is beneficial for adopting the intermittent heating mode to reduce running expenses. The economic analysis results indicate that the annual computational cost per unit area of the combined system is between the gas boiler system and the oil boiler system when applied to energy saving buildings in Qingdao.