| The air source heat pump is easily influenced by the change of the environment temperature.The current research mainly focuses on the compound air source heat pump energy supply system.The current research of solar air source heat pump is relatively common,but most of the researches are based on fixed conditions to study the performance of all aspects of the system.However,there is a lack of research on the multimode compound energy supply system which affects the performance of the system.This paper mainly focuses on the multi-mode operation characteristics of solar air source heat pump,and studies the influence of the change of mode switching conditions on system performance.After analyzing the climate characteristics of Wuhan area,four modes of work for solar air source heat pump are given.The control mode between four working modes is given.Various parameters of the building are set up by using the multi-dimensional building module which is built in the simulation software,and the dynamic thermal load of the building during heating season is calculated.Based on simulation software,a simulation model of composite energy supply system is established.The logic control signal between each model is compiled,and the effective control between each module in the simulation system is realized.Four kinds of working modes are studied one by one by means of control variable method.The influence of switching conditions between different modes on the operation of the system and other modes is studied.The research results show that during the heating season,proper switching parameters should be set according to the actual heating load.The research results on the influence of switching conditions between different modes on system performance are analyzed,and the performance of the system is optimized.The performance of the system is compared under the optimized operation mode and the fixed operation mode.Under the optimized operation mode,the heating capacity of the system is 3906.95 kW ?h and the system COP is 3.86.Compared with the fixed operation mode,the performance of the system has been improved.Based on the existing experimental platform,two typical working modes are selected under the four working modes of the solar air source heat pump compound energy supply system,and the experimental research is done.The experimental study of direct air supply mode(mode 1)in the collector has obtained the system COP of 3.94 and 4.4 respectively.The study of air collector heat input heat pump evaporator(mode 2)has obtained the system COP of 3.91 and 4.06 respectively.The experimental results are basically consistent with the simulation results.The research results have some reference value for improving the performance of the solar air source heat pump composite energy system. |
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