Research On Air Source Heat Pump System Using Thermal Storage Direct Condensation Radiant Plate Heat Exchanger

The air source heat pump has the characteristics of energy saving and environmen-tal protection.In the winter cleaning and heating in the northern region,it is considered to be the best choice for“Coal to electricity”.However,the current air source heat pump system has certain drawbacks.Therefore,this paper proposes an air source heat pump system using a thermal storage direct condensation radiant plate heat exchanger.First of all,the paper introduces the operating principle of the heating and defrost-ing of the air source heat pump system in winter.The structural parameters of the heat exchanger,the ribs,the charge of the heat storage medium,the arrangement of the re-frigerant pipeline,the selection of the materials and the processing technology were studied and optimized.In order to achieve heat dissipation and optimization of the pro-duction process.Then,the test plan for the system is determined with reference to the current stand-ards for radiators and air conditioners.A test bench was set up.The heat dissipation was measured under standard operating conditions,different condensing temperatures,different reference temperatures of the test chamber,and different refrigerant mass flow conditions.The test results show that the heat dissipation per unit area of the heat ex-changer can reach 1930W/m~2 under standard heating conditions.The regression of the standard characteristic formula is carried out for the parameters of the condensing tem-perature,the indoor air temperature,the indoor wall temperature and the refrigerant mass flow rate,which determine the heat dissipation amount of the heat ex-changer.Finally,the performance of the air source heat pump system was tested at different outdoor temperatures and during defrost conditions.Defrost conditions for a total of90s.The refrigerant temperature is reduced from 38.0°C to-4.9°C.The heat storage medium was reduced from 36.9°C to 29.1°C.The surface temperature is reduced from36.2°C to 30.5°C.It can be seen that the heat exchanger can continue to heat during defrosting.The thermal storage direct condensation radiant plate heat exchanger proposed in this paper surpasses the existing air source heat pump in terms of energy efficiency,thermal comfort and noise reduction.The development and utilization of this technol-ogy will generate huge economic and social benefits.