Research On Optimization Design Of Hybrid Energy System For Decentralized Heating

With the improvement of living standards and environment,the heating demand of people in the Yangtze River areas of hot summer and cold winter is growing and the heating demand in China is gradually expanding.However,the current building energy consumption has become one of the three “energy hungry” in our country.Using clean and renewable energy to provide heating and hot water is the key to solve this problem.In this paper,we put forward a kind of hybrid energy system for decentralized heating,which consist of the solar collector,air source heat pump and gas-fired heating and hot water combi-boiler.The research on optimization design of this system has been done.First of all,the system form of the hybrid-energy system has been determined after some analysis,the unsteady mathematical model of the heating units and the heat storage tank have been established to calculate the energy consumption.The experiment platform of the the hybrid energy system has been built for the tests on the thermal performance of the solar collector and gas-fired boiler and the values of the necessary parameters for solving the model have been obtained.The validity of the model was verified by experiment.Secondly,based on the test condition of the energy efficiency for the solar collector system and air-source heat pump system,a new test method for the hybrid energy system has been raised.Namely the relevant experiments under typical test conditions have been done to get the energy consumption,then the annual performance factor can be obtained according to the days of typical conditions by the weighted average method.Finally,the optimization design of the hybrid energy system has been done.Taking the annual performance factor and the annual total cost as the objective function respectively.The orthogonal experiment method and the annual cost method have been adopted in this paper to get the objective function of the schemes,which differ in the area of the solar collector,the kinds of air-source heat pump and gas-fired boiler and the volume of tank.Then the optimal system can be obtained according to the requirement of the users.Put a residential building in Guangzhou as an example to obtain the optimal system by using the the optimization design method proposed in this paper.The results of this study can provide a reference for the optimal design and production of hybrid energy system,which made it an convenient to promote this type of system.And the test method for the energy efficiency proposed in this paper lay the foundation of the performance test standard for the hybrid system.