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首页> 外文期刊>Energy Conversion & Management >The Investigation Of Relation Between Radiative And Convective Heat Transfer Coefficients At The Ceiling In A Cooled Ceiling Room
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The Investigation Of Relation Between Radiative And Convective Heat Transfer Coefficients At The Ceiling In A Cooled Ceiling Room

机译：冷却天花板室内天花板辐射与对流传热系数之间关系的研究

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摘要

In this study, the relation between radiative and convective heat transfer coefficient at the ceiling is determined for a cooled ceiling room of which floor surface is isolated. Firstly, convective heat transfer is simulated numerically neglecting the radiative heat transfer at the surfaces (ε_w =ε_c= 0) for different room dimensions (3 × 3 × 3, 4 × 3 × 4 and 6 × 3 × 4 m) and thermal conditions (T_c = 0-25 ℃, T_w = 28-36 ℃). Then, radiative heat transfer is calculated theoretically for different surface emissivities (ε_w =ε_c=0.7, 0.8 and 0.9). Numerical data are compared with the results of correlations based on experimental data given in literature. New correlations for convective and radiative heat transfer coefficients at the ceiling are found in the current study. The ratio of radiative heat transfer coefficients to convective heat transfer coefficients (h_(cr)/h_(cc)) is determined. It was seen that the ratios range from 0.7 to 2.3 depending on the temperature difference. The ratios increase as the temperature differences increase. Therefore, a new correlation between the coefficients is developed depending on temperature difference at the ceiling.
机译：在这项研究中，确定了隔离地板表面的冷却天花板房间的天花板辐射与对流传热系数之间的关系。首先，对流换热进行了数值模拟，忽略了不同房间尺寸（3×3×3、4×3×4和6×3×4 m）和表面条件下表面（ε_w=ε_c= 0）的辐射传热（T_c ＝ 0-25℃，T_w ＝ 28-36℃）。然后，理论上针对不同的表面发射率（ε_w=ε_c= 0.7、0.8和0.9）计算出辐射传热。根据文献中给出的实验数据，将数值数据与相关结果进行比较。在当前研究中，发现了天花板对流和辐射换热系数的新相关性。确定辐射热传递系数与对流热传递系数的比值（h_（cr）/ h_（cc））。可以看出，该比率根据温度差在0.7至2.3的范围内。比率随着温度差的增加而增加。因此，取决于天花板处的温差，在系数之间建立了新的相关性。

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