Optimization Of The Operation Of Multi-Source Coupled Heating System Based On Air Source Heat Pump

With the increasing level of global energy consumption in recent years,the development and application of renewable energy has been a major energy transformation trend.At present,the northern regions of China are actively carrying out clean heating work.Air source heat pump as a high-efficiency energy-saving non-polluting device has been widely attention,is the best choice to replace the bulk coal heating.But due to its efficiency in low-temperature environment,the application has been somewhat limited.Electric boiler as a clean energy initial investment but low energy utilization.Solar energy is good for energy saving but vulnerable to weather and cannot run all day.Therefore,this paper takes the air source heat pump as the research object,around the air source heat pump coupled with electric boiler and the air source heat pump coupled with solar heating system,combined with a practical project in a severe cold region,the two coupled heating systems are compared and analyzed.The key parameters are designed and optimized,and the optimization analysis of the system operation mode is carried out in different typical weather conditions.Firstly,the 3D modelling of a campus building in a severe cold region is carried out using TRNBuild simulation software.The dynamic simulation of the system is carried out for the yearround operating conditions.The hour-by-hour heat load of the annual heating season is calculated.The mathematical model of the equipment required for the system is also developed.A simulation model of the coupled heating system is constructed using TRNSYS.The mathematical model is validated by means of actual measurement data.With the objective of minimizing the annual value of costs,it is concluded that the coupled system is economically optimal at 80% of the air source heat pump.And the unit is selected according to the simulated maximum heat load.Secondly,two heating system models,air source heat pump coupled with electric boiler and air source heat pump coupled with solar energy,are established.The system performance and economics are compared and analyzed in terms of comparative heat production,energy consumption,COP,average indoor temperature and annual value of cost.Considering the coupling constraints of each parameter,the Hooke-Jeeves optimization algorithm is introduced in the GENOPT platform for capacity matching operation optimization to achieve simultaneous optimization of each parameter.With the life-cycle cost minimization as the design optimization objective,the best matching mode of the system is determined: the ratio of heat production between air source heat pump and electric boiler is 3.76:1,the ratio of heat production between solar collector and air source heat pump is 3.38:1.Finally,according to the classification method of meteorological parameters,outdoor temperature and solar radiation intensity are selected as classification indicators for the characteristics of the two coupled heating systems.The system clustering method is used to cluster and analyze the meteorological parameters of the annual heating season in the Jilin area.By using clustering method,the air source heat pump coupled with electric boiler system is divided into 8categories,and the air source heat pump coupled with solar system is divided into 14 categories.Based on the clustering results,the typical days of each sub-category are derived.On the premise of satisfying the heating demand,the lowest system energy consumption is taken as the operation optimization objective.With the help of TRNSYS software,the system energy consumption on a typical day of the heating season is simulated to determine the optimal opening time of the auxiliary heat source in the coupled heating system.The results shows that 5 small categories of the air source heat pump coupled electric boiler system need to turn on the auxiliary heat source and 8 small categories of the air source heat pump coupled solar system need to turn on the auxiliary heat source.Furthermore,the energy saving and environmental benefits of the two optimized coupled systems were also analyzed.The energy saving and environmental benefits of the air source heat pump coupled solar system were the most significant,with an increase of17.8tce in conventional energy replacement and 15.93% in total pollutant reduction compared to the air source heat pump coupled electric boiler system.