Design And Research Of Automobile Seat Air Conditioning Cooler Based On Thermoelectric Refrigeration

With the popularity of cars and the enhancive standard of living,the requirements for cars' comfortable capability are getting higher and higher.However,there has the vacancy in the domestic market for the refrigeration & heating dual-purpose seat air conditioning system.In this paper,an automobile seat air-conditioning system based on thermoelectric refrigeration is proposed,which can satisfied both refrigeration and heating conditions.Firstly,the selection calculation,structure design and electrical design of seat air-conditioning system are carried out,and the steady-state characteristics of seat air-conditioning system are studied by simulation and experiments,and the transient undercooling characteristics of seat air conditioning cooler are also studied experimentally.The system is designed by two conditions.One is the thermal load of the car seat under high temperature exposure.And another is the heat load generated by the heat dissipation from the human back while driving.Than the TEC,radiator and fan are selected and calculated.After that,the modeling the three-dimensional structures of cold-hot separator,connecting duct and controller shell are proceeding,and repairing the mould in late stage.Design and select the electrical part of the seat air conditioning system then.Under the condition of large heat load,the maximum cooling capacity condition is chosen,so as to achieve the goal of rapid cooling.On the basis of several basic refrigeration conditions,the optimal refrigeration condition is proposed to balance COP and cooling capacity.The electric current calculation formula of the optimal refrigeration condition is given.The reliability of the formula is verified by comparing the current corresponding to the optimum refrigeration condition in the experiment,and the error is within a reasonable range of 6.29%.ANSYS ICEPAK software is used to simulate the thermoelectric refrigerator of the car seat air conditioner which verify the correctness of the model selection design.And the influence of TEC working voltage and fan speed on refrigeration performance is studied.Then,the simulation results are compared with the experimental results by setting up hot-spot air-conditioner experiments.According to this,the accuracy of the simulation method and the reliability of the simulation results are verified.By studying the refrigeration performance curves of different working conditions and combining with the actual operation of two kinds of heat load conditions,the maximum cooling capacity working conditions are selected under large heat load conditions,which can reach the purpose of fast cooling by sacrificing the COP.That is,the maximum cooling capacity working voltage of 13 V and 13 gear of fan stalls(12.87m/s).When the heat load is relatively small,both the cooling capacity and COP are taken into account,as well as fan stalls seven(9.34m/s)and TEC working voltage 7V working condition.At last,the transient undercooling experiment of thermoelectric refrigerator is carried out to study the transient undercooling effect,which can rapidly reduce the surface temperature of the seat under heavy load.Then the effects of reference voltage,pulse amplitude,pulse time and wind speed on pulse undercooling were analyzed,respectively.From the view of the sudden temperature rise caused by the weakening of the pulse undercooling effect,the influences of the recovery voltage and wind speed on the adverse temperature rise are studied.By doing this,the purposes of obtaining the maximum undercooling temperature and producing a small temperature are getting.The research conclusions also provide the basis for the application of thermoelectric refrigeration in other directions.