Application Research Of Solar-Air Energy Heat Pump System For Residential Buildings In Alpine Area

In recent years,with the advancement of rural urbanization,many rural residence heating in villages have been transformed from coal-use to electricity-use.However,if the heating system in the north adopts electric-heating,the energy cost would be too huge.There are a lot of such single-family dwellings in northern rural areas.Therefore,based on a demonstration low-energy building in Wangtun Village,Qinghai Province,this paper studied a new heating system with solar energy source coupled heat pump and floor radiant heating technology.The corresponding dynamic simulation model was established based on TRNSYS platform,and its reliability was verified by the actual measurement and simulation data together.Then it was compared with the similar heating system from the perspective of energy saving,economy and environmental protection.Finally,the solar/air-dual source heat pump system was optimized and analyzed.Firstly,this paper introduced the general situation of a typical single-family residential building in Wangtun Village,Guide County,Qinghai Province,which was belong to the climatic characteristics of alpine regions.In detail,it included the parameters and indexes of the building envelope,the thermal insulation measures and heating system adopted by the object.Secondly,in order to study the thermal load characteristics of the demonstrative low-energy building,this paper measured the relevant parameters of the subject under different working conditions,including solar radiation illumination,indoor and outdoor hourly temperature,heat pump power and so on.Therefore,this chapter introduced the relevant test scheme in detail,including test conditions,test instruments and test contents,and analyzed the test results under different working conditions.Thirdly,in order to build a reasonable and reliable simulation model of the solar/air-dual source heat pump system,this paper introduces the working principle of the main equipment involved in the heating system.Then the mathematical model was explained in detail,and the equipment selection was calculated.This mainly includes:solar collector,air source heat pump,heat storage tank,circulating water pump.In addition,the basic form of the system and its transient calculation model was analyzed and introduced.Then,based on TRNSYS platform,a dynamic simulation model of the solar-air source coupled heat pump system was built,and the reliability of the model was verified by the above measured results.This part includes the introduction of TANSYS software and its main components,the construction of the solar/air dual source heat pump system model was based on the mathematical model detailed above,The TRNSYS model was verified by fitting analysis.Finally,the system benefits of three kinds of heating system in different coupling modes was analyzed from multiple angles,which mainly include energy saving benefits,economic benefits and environmental benefits.Furthermore,the optimized refrigerant mass flow rate was analyzed based on the solar-air source coupled heat pump system to determine the optimal mass flow rate and analyze its influence on the performance of the heat pump.