| With the rapid increase of energy consumption and the continuous development and utilization of new energy,the air-source heat pump technology has been widely used because of its advantages of energy saving,convenience and less investment.The use of air-source heat pump technology for low-temperature floor radiation heating can solve the problems of energy consumption and environmental pollution in the field of heating,so it has been continuously promoted.However,the traditional floor radiant heating system uses low thermal conductivity of polyethylene pipe,some areas can not meet the heating requirements.The heat pipe has the advantages of strong thermal conductivity and good isothermal property.In this paper,the heating effect of low temperature floor radiation heating system of air source heat pump is analyzed by experiment,compared with the air source heat pump polyethylene tube floor radiation heating system and the air source heat pump direct heat floor radiation heating system.The effects of two parameters of heat pipe spacing and heat source temperature on the new heating system were studied by optimizing experiments on the air source heat pump heat pipe floor radiant heating system.The heat transfer area of heat pipe is increased by combining heat conducting carbon fiber with heat pipe.The average temperature in the heat pipe heating room is higher than 0.7℃ in the straight heat pipe and 3℃ in the polyethylene tube.The air source heat pump floor radiant heating system experiment rig was built independently.The water in the fixed water tank is 0.3 m3,and the heating room model is made,and the concrete plate area is 50 × 50 cm2.Experiments were carried out on the end of the heating system by heating the concrete plates in the model of the heating room with polyethylene pipe,direct heat pipe and heat pipe respectively.The average surface temperature of concrete heated by heat pipe is 28.7℃,and the average temperature of room model is 22℃,which meets the requirement of indoor comfort in winter.The average surface temperature of concrete is 2.5℃ higher than that of directly heated concrete,and 4.6℃ higher than that of PE tube.The average temperature in the heat pipe heating room is higher than 0.7℃ in the straight heat pipe and 3℃ in the polyethylene tube.The heating capacity of air-source heat pump is 534.5W when heat pipe heats concrete plate,which is higher than that of polyethylene tube 152.7W and straight heat pipe 76.3W.On this basis,the influence of heat pipe spacing and heat source temperature on the heating system was studied experimentally.The average surface temperature of concrete,the homogeneity of the average temperature in the room model and each measuring point,the uniformity of the temperature distribution in the room model and the matching between the heat source temperature and the heating capacity of the air-source heat pump were compared.The optimum scheme is that the tube spacing is 15cm and the heat source temperature is 45℃.By combining carbon fiber with heat pipe to heat the concrete plate,the experimental analysis shows that the average surface temperature of concrete,the average temperature in the room model and the temperature distribution uniformity of each measuring point are better than that of the single heat pipe heating method. |
