Study On The Photoelectric Complementary Heating System In Cold Areas

With the development of society,the problem of energy exhaustion and environmental pollution has become increasingly prominent.Traditional heating methods such as coal-fired and oil-fired boiler rooms have not met the development requirements.Clean energy heating has become a new trend.Under this trend,electric heating has been vigorously promoted,Combining the preferential policy of electric heating and the advantages of solar energy.In this paper,the photoelectric complementary heating system,which is a complementary heating system between electric heating and solar heating,is proposed.Firstly,according to the climate characteristics and relevant design specifications in cold areas,the calculation methods of building heat load,solar collector area,collector side flow,electric boiler power and hot water storage tank volume are analyzed,and the installation orientation,inclination angle and operation control strategy of solar collector are discussed.Secondly,through the analysis of the heat transfer process of the system components,the mathematical models of photoelectric complementary heating system equipment such as solar collector,hot water storage tank,electric boiler and user side are established,and the simulation of photoelectric complementary heating system is carried out by using MATLAB software programming,inputting relevant initial conditions and meteorological parameters.Thirdly,a photoelectric complementary heating project in Zhangjiakou is tested,the actual operation data are analyzed,the problems in the project are discussed,and the project is simulated by mathematical model and programming.The results show that the maximum relative error between simulation results and test results is 10.3%,which verifies the rationality and reliability of the model and program.Finally,the operation of the system under the meteorological parameters of typical years is simulated,and the operation data of typical days in extreme cold period and transition period are analyzed as examples.The results show that the solar energy assurance rate of the solar collector system varies greatly in the whole heating season,only 15.11% in January,and 52.15% in March.At the same time,the annual cost value can be used as an evaluation index to evaluate different solar energy assurance rates.The results show that the electricity price has a great influence on the selection of the optimal scheme of the system,and the higher the electricity price,the larger the area of solar collector with the optimal scheme.The operation control strategies of the system under time-sharing price and no time-sharing price are given through simulation analysis.