Research On Heat-retaining Properties Of Solar Greenhouse Walls

This study was carried out to understand the effect of the north wall on internal thermal supply. The experiment designed some little greenhouses which have different wall structure.By measuring the property of heat preservation of these greenhouses and observing the change of different inner depth of these wall which have different wall structure, we studied the the property and law of these different wall and found some law as follows:1. In all these walls which have different structure as follows:0.12m red brick+0.12m soil+0.24m red brick,0.12m red brick+0.24m soil+0.12m red brick and0.24m red brick+0.12m soil+0.12m red brick, the wall of0.24m red brick+0.12m soil+0.12m red brick has the best property of heat preservation, the wall which has the structure of0.12m red brick+0.24m soil+0.12m red brick has the worst property of heat preservation. All these deals are better than0.12m red brick+0.24m atmosphere+0.12m red brick.2. In all these walls which have different structure as follows:0.12m red brick+0.24m coal qanque+0.12m red brick,0.12m red brick+0.24m lime+0.12m red brick and0.12m red brick+0.24m polyphony board+0.12m red brick, the wall of0.12m red brick+0.24m coal qanque+0.12m red brick has the best property of heat preservation, the wall which has the structure of0.12m red brick+0.24m polyphony board+0.12m red brick has the worst property of heat preservation. All these deals are better than0.12m red brick+0.24m soil+0.12m red brick.3. With the change of the depth of all these walls, the temperature curve go to moderation. The wall of0.24m red brick+0.12m soil+0.12m red brick has the best capacity storing quantity of heat; the wall of0.12m red brick+0.12m soil+0.24m red brick deliver large amount of heat toward the outside,as a result,it’s heat preservation is not very good; the difference between0.12m red brick+0.12m soil+0.24m red brick and0.12m red brick+0.24m soil+0.12m red brick is the property of heat insulation of the exterior wall surface.4. If the wall structure is0.12m red brick+0.24m(some materials)+0.12m red brick, the ratio of heat conduction of the wall inner polyphony board is very low, but its capacity storing quantity of heat is very bad, the storing quantity of heat of coal qanque and lime are better than polyphony board.So, when we build the wall of greenhouse, we have to synthesize the storing quantity and heat insulation of heat of filling material and the wall structure.