Experimental And Simulation Study On Heat Transfer Characteristics Of Solid Regenerative Electric Heating Device

In recent years,the state has put forward a series of policies such as peak and valley electricity price,which provides a more fertile soil for the application of solid heat storage technology in the heating industry.At present,the solid heat storage electric heating device has been put into the market for a short time and has not been widely used.Therefore,this paper will use the method of combining experiment and simulation to study the problems existing in the solid electric heat storage heating device,and make improvements to it,so as to achieve the purpose of promoting the solid electric heat storage technology.This paper is based on the existing solid heat storage electric heating device for testing experiments,found the existing problems of the device,through numerical simulation to find the best structure parameters and operating parameters to improve the performance of the solid heat storage electric heating device,and study the effect of solid heat storage electric heating device on the indoor temperature field.Firstly,the solid heat storage electric heating device is tested.The experiment lasts for 24 hours and is divided into two stages.The first 8 hours are the stage of simultaneous heat storage and release,and the heating power is 1600 W.The last 16 hours were only exothermic.The experimental results show that the maximum temperature of the outlet of the solid heat storage electric heating device reaches 136℃,far exceeding the relevant national standard.In addition,the peak temperature of the top surface and the front surface also reach 79℃ and 83℃ respectively,which still has certain safety risks.As for the indoor thermal environment,the proportion of the time in the comfortable temperature range of the two typical planes(Z =0.8m and Z =1.6m)was 60% and 63.3% respectively,both lower than 70%.Secondly,according to the theory of heat transfer and numerical simulation,the numerical model of the solid heat storage electric heating device is established.Then,the influence of structure factors and operation factors on the performance of the solid heat storage electric heating device is studied.According to the simulation results,comprehensive set up three optimization strategy,and through the simulation comparison with the original model,verify the improvement effect of three optimization strategy,and improve the effect of the heating of the heat storage device is selected the best optimization strategy 1,results show that the optimized strategy 1 under the condition of solid outlet of the highest temperature of the heating of the heat storage device has fallen by 53.33%,The maximum temperature of the top surface decreased by 15.54%,and the maximum temperature of the front surface decreased by 32.52%.Finally,a numerical model of the solid heat storage room was established to simulate the indoor temperature field.The results show that the solid heat storage electric heating device under the condition of optimization strategy 1 significantly improves the uniform distribution of indoor temperature field and the overall thermal comfort effect,and the proportion of the time that Z =0.8m and Z =1.6m typical plane temperatures in the room are in the comfort range is greatly increased,both of which exceed 70%.This paper studies the heat transfer characteristics of solid heat storage electric heating device.The influence of structure factors and operation factors on the performance of solid heat storage electric heating device is studied.The influence of the device on the indoor temperature field is also studied,which promotes the application and development of the solid heat storage electric heating device in the field of architecture.