太阳能相变蓄热集热墙二维非稳态模型及分析

TWO-DIMENSION UNSTEADY MODEL AND PERFORMANCE ANALYSIS FOR TROMBE WALL SYSTEM WITH PHASE CHANGE MATERIALS

通过对太阳能相变蓄热集热墙系统的简化,建立一套能较准确反映系统热特性的二维模型,应用CFD方法,结合该模型对系统进行稳态和非稳态模拟。通过与文献中计算结果的对比,验证了该模型的准确性,误差在±6%以内。藉此模型,模拟分析了空气通道宽度对太阳能相变蓄热集热墙系统热特性的影响,结果表明,计算工况下当空气通道宽度为13cm时,系统的平均供热量最高。

A simple unsteady 2-D model was developed for Trombe-wall system with phase change materials using a CFD toolkit--Fluent,, by which the thermal characteristics of the system under winter conditions can be accurately described. Both steady and unsteady simulations could be carded out to analyze the system. The model is validated by comparison with the results in the reference [ 8 ] with the deviation of ±6%. Using this model, the effect of width of the air passage on thermal performance of the system was investigated. It is found that 13cm width of the air passage would provide the highest heating capacity to room under the considered conditions.