Research On Air Source Heat Pump Combined With Radiator Heating In Hot Summer And Cold Winter Area

Hot summer and cold winter area is traditionally non-heating areas.However,it is cold and humid in winter in this area.In recent years,freezing and snow disasters occur frequently in winter in southern China,and the temperature has hit the lowest repeatedly.This climate has seriously affected people's daily life and work.With the improvement of people's living standard,the demand for heating in winter is becoming more and more urgent in this area.In recent years,more and more residents use various household heating equipment by themselves,which makes the consumption of heating energy rise sharply.In this paper,the air source heat pump plus radiator heating system is selected,and the stability,comfortand energy saving of the system are studied based on the climate characteristics of the region.Firstly,the working principle,mathematical model and heating characteristics of air source heat pump are briefly analyzed in this paper.Based on the analysis of heat pump sample parameters and the climate characteristics in hot-summer and cold-winter area,it is pointed out that the heating load should be modified intermittently while selecting heat pump,and the heat-cooling ratio of building load should be paid attention to.The methods and control strategies of heat pump defrosting are also briefly introduced.An air source heat pump-radiator heating system is built in a residential building in Hefei.This paper also introduces the relevant content of the test,including the test object,test scheme and test parameters.Through the analysis of the test results,it can be seen that the temperature of the system's supply and return water are almost not affected by the outdoor temperature.Besides,the analysis of the operation effect of the air source heat pump radiator heating system shows that the system runs well during the test period,most of the COP of the system is above 2.5 and the average COP of the system is 2.67.Therefore,it can be considered that the heating system can operate steadily in hot-summer and cold-winter area.According to the climate characteristics of hot summer and cold winter area,on the premise of meeting the comfort of room heating,the intermittent heating operation test is carried out to further reduce energy consumption.The operation mode of night operation and day shutdown is adopted.The experimental results show that the intermittent operation?running only from 17:00 to 7:00 the next day?and the temperature in the heating room are between 17¹9?.Therefore,it can be considered that the heating system can operate steadily in hot summer and cold winter area.In this paper,EnergyPlus software is used to simulate the test of residential air source heat pump radiator heating system.The simulation data analysis shows that the simulation results are in good agreement with the measured data,which shows that the heating system is reliable.On this basis,this paper uses EnergyPlus software to simulate the comfort and economy of testing residential heating system.The PMV-PPD of the residence can meet the requirements of Class II thermal comfort specified in the Code for Design of Heating,Ventilation and Air Conditioning of Civil Buildings GB50736-2012.From 1st December to next year 28th February,the power consumption of the heating system is2185.01 kW.In order to analyze the economy of the heating system,the annual cost method is used.The results show that the annual cost of the air source heat pump heating mode is 26.72 yuan/?and less than that of the gas wall hanging furnace heating mode.From the point of view of energy saving,compared with gas wall-hanging furnace heating mode,the residential air source heat pump heating mode saves 566.97 kg of standard coal annually,and the emission reductions of soot,CO₂and NO_X are 5.67 kg,1.40 t and 11.34 kg,respectively.Therefore,the air source heat pump heating mode is more suitable for residential buildings in hot summer and cold winter areas,whether from the economic point of view or from the energy saving point of view.