| Heat collector wall can significantly reduce the energy consumption of buildings when it used for heating in winter.It is widely used in passive solar house,and it absorbs solar radiation and then transfers heat to the room for heating.Firstly,the wall structure was optimized in steady state.The results demonstrate that the "better structure" of the dual-channel porous solar wall is that the air channel1 spacing is 0.08 m,the porous wall thickness is 0.08 m,and the air channel 2 spacing is 0.06 m.Meanwhile,the average indoor temperature of heating room is 292 K,and the total heat storage of the wall is 100.17 MJ.Secondly,the influence of the emissivity of outer surface of porous wall and the speed of fresh air on the heating performance of heating room is studied.The research results show that the increase of the emissivity of outer surface of porous wall and fresh air speed can lower the heat storage performance of the heating room.Finally,the non-steady state calculation of heating room is carried out to study the temperature change of each component of heating room.The results indicate that the highest average temperature and the lowest average temperature are 289.17 K and278.50 K for double-channel porous solar wall after absorbing solar radiation in day time,respectively.In addition,the influence of different closing time of the air channel 1 on the temperature variation of heating room is also studied.The air flow channel 1 is closed before without solar radiation for 1 hour,and the heating performance of heating room is better.Compared with the room without double-channel porous solar wall,the average room temperature can reach over283.15 K for more than 10 hours.The numerical simulation can provide reference for the structural optimization and the performance analysis of double-channel heat collector wall. |
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