Performance And Application Study Of A Hybrid Solar Heating System With Solar Kang

With the development of economy of the world and the progress of technology,building energy consumption is a main part of the total energy consumption of the world.Residential heating and hot water account for a large percentage of the building energy consumption.Therefore,how to reduce the building energy consumption and choose the green heating mode is the research emphases for a time.As solar power has the merit of reproducible and environmentally friendly,it has the potential to replace fossil fuels.Solar thermal technology is of maturity and widely used nowadays.The applications of solar energy technology in buildings is an important development direction in the domain of energy efficiency in buildings.When considering the applications of solar energy in buildings,not only the economical efficiency and technology should be evaluated,but also the life style of local residents and easy operation and simply maintenance.In this thesis,the concept of traditional Chinese kang,which is widely used in northern China,is combined with the solar heating method.A hybrid solar heating system is put forward,which consists of a solar kang system and a solar air heating system.The system is specially designed to make it acceptable to the local population.This system can improve the indoor comfort and solve the problem of air pollution and high energy consumption.Operation model of the system is designed to fit the residents'routine,and this model can furtherly reduce the energy consumption.Overall,this hybrid solar heating system is a economical,high-efficiency,reliable solution of rural heating.In this thesis,the hybrid system is introduced and studied by both experimental studies and theoretical analysis.The main content is as follows:1.The hybrid solar heating system is installed in the demonstration building in Qinghai province.The heating performance of the system in heating period is tested.Experiments with only the solar kang system worked,only the solar air heating system worked and hybrid heating system worked is done.According to the experimental results,the coupling thermal response process between the heating system and the building is compared and analyzed,and the heat transfer mechanism of the system is analyzed.Experimental analysis provides a reference for theoretical heating.2.A dynamic mathematical model of the system is built with the parameters of the material and structure of the system and building.And it is simulated with the weather data tested in winter season.Simulation results is validated through the comparison of simulation results and experiment results.It provides the analysis tools for further Analysis&Optimization.The influences of different solar collector areas,insulation properties of walls is also analyzed in this section.3.With the weather data of Xining,the influences of system's operation on residents' sleeping comfort is discussed.The influence factors of sleeping thermal comfort is discussed and the operating performance of the system without auxiliary power is examined with the test weather data.A special operation model is proposed to furtherly reduce the energy consumption,and the energy-saving effect of the system is simulated under the operation mode.Solar fraction of the system could reach 65%at daytime and 90%at night.The annual operating performance of the system is also calculated and analyzed,and the applicability of the system in northern china including north-east,north-west is also discussed with the typical weather data.In summary,the studies in this thesis have provided some scientific basis and research thought for study on the thermal performance and the potential for further promotion of the hybrid solar heating system.