Research On The Characteristics Of Solar-air Dual Heat Source Single-stage Compressed Carbon Dioxide Heat Pump Water Heater System

As people increasingly attention for life and the environment,people begin to seek for the environment pollution-free refrigerants due to hydrogen chlorofluorocarbons as HFC HCF of atmospheric serious pollution caused by serious damage of the ozone layer,the greenhouse effect,this kind of refrigerant by countries to develop relevant law banned or reduce the use of so humans began to seek non-toxic to the environment pollution-free and conform to the inexhaustible new refrigerant CO₂ as refrigerant into everyone’s vision from the nineteenth century,its thermal performance is good,the higher thermal stability properties,GWP is 1,the ODP is 0,is a new type of non-toxic non-flammable As a kind of unique heat energy in nature,green environmental protection refrigerant solar energy is widely used in heat pump system.Whether the combination of the two can improve system efficiency and save energy,this paper will study the solar energy-air double heat source single stage compressed CO₂ heat pump water heater system.In this paper,mathematical models for compressors,throttles,and air coolers and dual heat source composite heat exchangers in a single-stage compressed carbon dioxide heat pump water heater system with solar-air dual heat sources are established respectively.Among them,air coolers and dual heat sources Compound heat exchangers use the distributed parameter method.By simulating the operation of three heating modes:dual heat source mode,single solar mode,and single air source mode,the three heating modes are compared and analyzed at the same solar water inlet temperature for system heating,system COP,and user-side water temperature comparison.Data comparison of system heating,system COP,and user-side water temperature at the same solar hot water inlet flow.By comparing the comparison results of these three sets of data under various operating conditions,the system operating characteristics of the solar-air dual heat source single-stage compressed carbon dioxide heat pump water heater system in different modes are obtained,and the optimal operation of the system under different operating conditions is determined.According to the henan region simulated experiment,the winter home heat pump water heater running the simulation calculation results and the research previous single-stage across critical CO2 heat pump water heater is the result of the experiment,this paper compares and analyzes the error is within 5%this paper only studies the solar hot water yield of solar hot water temperature changes the influence of the change of environmental temperature on the system,the results show that the performance of the system is proportional to the these factors change Within the scope of the composite heat transfer temperature difference,double heat source model is a single air source heat increased by0.1%～36%,the system is increased by 21%～34%,and the user side of the water temperature increased by 23%～35.6%of the single solar mode from a single air source heat increased by 21%～35%,the system increased by 21.4%～33.3%,and the user side of the water temperature is increased by 22%～30.9%within the compound heat transfer temperature difference,when the environment temperature is lower than 5,with a single solar mode,the environment temperature is higher than 5,with double heat source mode...