Analysis And Structure Optimization On The Characteristics Of Heat Exchange And Dehumidification Of Air-cooled Fin-and-tube Evaporator

Fin-and-tube evaporator is one of the most important components of refrigeration system,which is widely used in refrigeration,air conditioning,chemical industry and other fields,it will affect the system performance directly.Therefore,its research can improve the performance and reduce the material cost by improving the finned tube evaporator core structure.In this thesis,based on EVAP-COND and the steady state distributed parameter model,the experimental data are used to compare the EVAP-COND and steady-state distributed parameter model which verify the accuracy of the steady-state distributed parameter model.Under dry condition,the effect of tube outside diameter,tube pitch and fin pitch on the finned tube evaporation are analyzed about heat transfer,the pressure drop on the refrigerant side and on the air side,as well as the dehumidification characteristics under wet condition.Achieve batch of data by using the steady state distribution parameter model which tube outside diameter,tube pitch and fin pitch within the constraints.The 1stOpt software is used to generate four objective functions based on these three variables and the four functions are about heat transfer/latent heat,the pressure drop of refrigerant side,the pressure drop of air side and price.Finally using the four objective functions based on genetic algorithms for multi-objective optimization.The results show that the difference between the simulation results and the experimental results is within the error range under the same structural parameters and operating conditions,which proves its reliability and effectiveness and can be applied to other simulation applications.It is found that the influence of the tube outside diameter,tube pitch and fin pitch on the cooling capacity and latent heat was different,but on the pressure drop on the refrigerant side and the air side are the same.Also demonstrate that the optimization results of the finned tube evaporator with different characteristics are different.