Simulation Study Of Desiccant Wheel Air Conditioning System Regenerated By PVT And GHP

Architecture is the important place where people used to work and life,the energy consumption of architecture has occupied one third of the annual energy consumption,With 40%~60%were used in the direction of hot and wet environment controller,and the main consumption is non-renewable energy,so there will be great potential research on hot and wet environment control based on the new energy.Desiccant wheel air conditioning is a temperature and humidity independent control system that is good at energy-saving,in view of the natural gas and solar energy resources are rich in our country,this paper make some improvements on the GHP(Gas heat pump)and desiccant wheel hybrid air conditioning system,established the desiccant wheel air conditioning system regenerated by PVT(Photovoltaic/thermal)and GHP,exploited the simulation model of this system under MATLAB platform,and made the simulation study of this air conditioning through the simulation model.According to the theoretical model,established the simulation model of desiccant wheel subsystem,GHP subsystem and PVT subsystem by the MATLAB platform,a commercial mathematical software,based on the principle of desiccant wheel air conditioning system regenerated by PVT and GHP,apply the established models to simulate the air conditioning system,verify the subsystem by comparing the simulation results to the existing experiment results,established the simulation model of desiccant wheel air conditioning system regenerated by PVT and GHP based on the verified subsystem simulation model.Simulated and analyzed the basic performance of desiccant wheel air conditioning system in different process air flow,different process air temperature,different process air humidity,different wheel speed,different sun illumination,different engine speed and whether existing the precooler by the simulation model of desiccant wheel air conditioning system regenerated by PVT and GHP.The performance of desiccant wheel air conditioning system could be influenced by many factors.When the process air flow increased from 500m3/h to 1200m3/h,the system supply air temperature,the evaporating temperature and COP respectively increased from 29.18℃ to 30.82℃ 9.07℃ to 10.12℃、1.83 to 2.57,the condensing temperature and refrigeration temperature increased slightly.When the process air temperature increased from 20 ℃ to 38℃,the system supply air temperature,the evaporating temperature,COP and the refrigeration temperature respectively increased from 16.32℃ to 33.43℃、8.92℃ to 11.25℃、2.31 to 2.69、51.01 ℃ to 54.02 ℃,dehumidification declined from 0.0031 kg/kg to 0.0013kg/kg,the condensing temperature increased slightly.When the process air relative humidity increased from 0.3 to 0.9,the dehumidification,the evaporating temperature,the COP and the refrigeration temperature increased from 0.0013kg/kg to 0.0025kg/kg,10.49℃ to 12.21℃ 2.52 to 2.84,53.47℃ to 55.93℃,the supply air temperature and condensing temperature increased slightly.When the wheel speed greater,the system dehumidification,evaporating temperature and the COP greater,supply air temperature,condensing temperature and refrigeration temperature are influenced slightly.When the intensity of sunlight greater,the supply air temperature,dehumidification,condensing temperature,evaporating temperature and refrigeration temperature are greater,the COP is smaller.When the engine speed greater,the supply air temperature is smaller,dehumidification,condensing temperature,evaporating temperature and refrigeration temperature are greater,the COP is smaller.The precooler in the desiccant wheel air conditioning system could improve the performance of the dehumidification,the simulation results show that the dehumidification is greater when the system has the precooler in the same refrigeration temperature,0.0003 kg/kg greater.