Research on Heat Storage and Release Performance of Phase-change Heat Storage Electric Heating Module
A phase-change heat storage electric heating module is designed,and the influence of thick-ness of insulation layer on heat dissipation surface,thickness of insulation layer on other surfaces and heat storage time on the heat storage and release perform-ance of the module is simulated and analyzed.The re-search results show that under the basic working condi-tions(the thickness of insulation layer on heat dissipa-tion surface is 5 mm,the thickness of insulation layer on other surfaces is 60 mm,and the heat storage time is 8 h),the average temperature of heat dissipation sur-face is maintained above 30 ℃ for about 22 h,and the average heat flux density of heat dissipation surface can last for about 23 h within the range of 60 250 W/m2.The module can stably dissipate heat into the room for a long time.When the thickness of insulation layer on heat dissipation surface is 3,5 and 7 mm,the average temperature of heat dissipation surface during the phase change stage is 61,54 and 49 ℃,and the effective heat dissipation time is 21,22 and 23 h,respectively.The average heat flux density of heat dissipation surface is 218,183 and 158 W/m2,respectively.When the thickness of insulation layer on heat dissipation surface is 3,5 and 7 mm,the temperature rise inside the mod-ule during the overheating stage is 15,21 and 26 ℃,respectively.The temperature rise inside the module,on the surface of the electric heating tube,and on other surfaces increases with the increase of the thickness of insulation layer on the heat dissipation surface,and the heat dissipation time also increases with the increase of the thickness of insulation layer on the heat dissipation surface.When the thickness of insulation layers on other surfaces is 20,40,60,100 and 200 mm,the average temperature of the heat dissi-pation surface during the phase change stage is 53,54,54,54 and 50℃,and the effective heat dissipation time is 18,21,23,23 and 23 h,respectively.The aver-age heat flux density of the heat dissipation surface is 179,186,186,186 and 165 W/m2,respectively.When the thickness of other surface insulation layers is not greater than 100 mm,the total heat dissipation of the module increases with the increase of insulation layer thickness.When the thickness of insulation layers on other surfaces is 200 mm,the total heat dissipation of the module relatively decreases.When the heat storage time is 5,6,7 and 8 h,the highest temperature of heat dissipation surface of the module is 54,54,57 and 66℃,respectively,and the effective heat dissipation time is 13,16,19 and 22 h.As the heat storage time increa-ses,the total heat dissipation of the module increases,and the effective heat dissipation time extends.
phase-change heat storage electric heating moduleheat storage and release performanceinfluencing factorsnumerical simulation
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