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建筑外壁面换热系数对室内自然对流传热影响

DOI: 10.11990/jheu.201411055

Keywords: 建筑节能, 自然对流, 供暖, 对流换热系数, 热舒适, 数值模拟

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Abstract:

为研究建筑外壁面换热系数与供暖室内自然对流换热的关联性,采用修正的湍流k-ε 模型对外墙外壁面不同换热系数情况下的室内自然对流换热过程进行了数值分析并对比了热负荷值。结果表明:在满足室内供暖温度(18℃)要求条件下,考虑外界辐射和蒸发对外壁面换热过程的作用(外壁面换热系数取8.1 W?m-2?℃-1),所得散热器表面的换热能力要低于按照暖通设计规范取值(外壁面换热系数取23.3 W?m-2?℃-1)所得结果,两种取值方式对室内温度场和舒适性的影响很微弱,但所得室内热负荷之间的差异达到了6.2%。

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