Research On Parameter Optimization Of Solar Energy-Air Source Heat Pump Compound Heating System

As a major renewable energy source,solar energy has many advantages such as wide distribution,cleanliness,and safety.However,in the actual application process,its unstable and discontinuous characteristics cause the system to require auxiliary heat sources for auxiliary heating.As a green heating method,the solar-air source heat pump combined heating system reduces the dependence on fossil energy and improves the air quality during the heating period in my country.The combined use of solar energy resources and air source heat pumps can make up for the shortcomings of their individual heating,so that the system has good stability and continuity.However,the economy,system performance,ability to meet heating demand and heating comfort of the solar-air source heat pump combined heating system are the biggest obstacles to the promotion of the current combined system.Therefore,it is of great significance to design the system parameters reasonably to meet the above-mentioned requirements of users for the composite heating system.In order to solve this problem,this paper takes a building in Baotou as an example to optimize and analyze the key parameters of the solar-air source heat pump combined heating system,and provide certain guidance for the optimization of the parameters of the solar-air source heat pump combined heating system.First,determine the composition and principle of the solar-air source heat pump combined heating system,design the operation logic and control mode,and select the main components of the system;secondly,establish the mathematical model and use of the solar-air source heat pump combined heating system TRNSYS software performs simulation modeling;again,the economic optimization of the key parameters of the solar-air source heat pump composite heating system;finally,some shortcomings are found after the economic optimization of the solar-air source heat pump composite heating system,so consider solar energy-The air source heat pump combined heating system is affected by multiple factors,so it is optimized with multiple parameters and multiple objectives.The specific research content is as follows:(1)For the optimization of system economy,first optimize the circulation flow of the solar-air source heat pump combined heating system.After optimization,the total operating cost is reduced by 23.8% compared with before optimization,and the system heating capacity is slightly increased.(2)Secondly,the cost annual value is used to optimize the objective function.After optimization,it is found that although the optimized annual cost of the system is much smaller than before,but at the same time there is also a reduction in the heating capacity of the composite heating system and large fluctuations in room temperature,etc.problem.(3)Two schemes are proposed for multi-objective parameter optimization of the solar-air source heat pump combined heating system.First,a new evaluation index is proposed,and the new index is used as the objective function for optimization.After optimization,the heating capacity of the system is larger than before optimization.The heat collection of the collector is significantly higher than before optimization,and the annual value of the system cost is greatly reduced compared with that before optimization.(4)Secondly,the weight of each index factor is determined by the fuzzy analytic hierarchy process,and then the orthogonal experiment method is used to optimize the parameters of the composite heating system.After optimization,it is found that the objective function is reduced by 9.6% compared with the initial parameter group,and the room volatility is,economy,system performance and energy saving have been significantly improved.