Energy-saving Flat Heat Pipe PV/T Air Conditioning Air System And Thermodynamic Optimization

Since China put forward the "carbon peak in 2030,carbon neutral in 2060" plan,it has attracted high attention in the low-carbon field.Air conditioning and ventilation energy consumption accounts for a large proportion of People’s Daily energy consumption,so reducing air conditioning and ventilation energy consumption is particularly important to achieve the goal of energy conservation and emission reduction.In addition,solar energy as a clean and renewable energy gradually on the stage,showing its unique and excellent characteristics,and the emergence of solar air conditioning has also played a huge role in reducing the energy consumption of HVAC.In response to the call of national green building,this paper designs a flat heat pipe solar PV/T air conditioning system.First,the flat heat pipe was selected,the experimental table was set up,and the relevant data acquisition instrument was connected.Change different experimental conditions to study the influence of flat heat pipe,fan and different seasons on photovoltaic panels.In the summer time,it is found that if the air conditioning system with the flat heat pipe installed and the forced convection of the fan is introduced,the higher the photoelectric conversion efficiency of the photovoltaic panels are.The flat heat tube solar PV/T system is optimized using finite time thermodynamic theory.Firstly,the irreversibility of thermal leakage,thermal resistance and circulation is considered,the flat heat tube PV/T system cycle model is constructed,and then the Lagrange multiplier method is used to optimize the target function to study the proportional relationship between the condensate end and the evaporation end area under the optimal comprehensive photothermal efficiency of the system.Finally,the optimization results are verified.The results show that timely changing the length of the condensation section can not only improve the temperature of the condensation section,better release heat,but also improve the overall efficiency of the system.TRNSYS software was used to build up a flat heat pipe PV/T air conditioning system,the original system and the optimized system were simulated,and the change of hot water temperature and comprehensive efficiency produced by the two systems was analyzed.The results show that the hot water temperature produced by the optimized system can reach 57.3℃,12.1%higher than the original system,the comprehensive efficiency of the optimized system is 53.1%,4.7%higher than the original system,the hot water temperature of the optimized system can reach 55.2℃,15.9%higher for the optimized system and 50.3%higher over the comprehensive efficiency of the original system.Finally,the flat heat pipe PV/T system is evaluated from three aspects of economy,energy saving and environmental protection.Although the system invests heavily in economy,the payback period is short;the system uses solar energy as clean energy;for environmental protection,the pollutant emission is low.In conclusion,this system is worth the application and promotion.