Abstract

Based on a low temperature grain storage granary in Beijing zone, an unsteady two-dimensional model of heat transfer on external wall is set up in the study. The heat-transfer model is simplified reasonably. According as the heat-conduction differential equation, initial and boundary conditions, the temperature fields of external walls in south with different kinds of heat insulation are simulated and calculated with CFD software. The numerical results are compared and analyzed. The results show that the attenuating role of external wall with interior heat insulation to the outdoor air temperature fluctuation is smaller than which with exterior heat insulation and that the heat storage capacity of external wall to prevent of the temperature fluctuation is weaker, too. At last, it is pointed that external wall heat insulation offers a guarantee to achieve low temperature grain storage and energy-saving and the heat insulation performance of external wall with exterior heat insulation layer is better than which of interior heat insulation layer and during the energy-saving design of the granary external wall, the technology of exterior heat insulation should be used as far as possible.

Keywords:

CFD, external wall heat insulation, heat insulation performance, low temperature grain storage granary, unsteady two-dimensional heat transfer,

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