Review on the Surface Heat Transfer Coefficients of Radiant Systems
Review on the Surface Heat Transfer Coefficients of Radiant Systems
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DOI：
10.1051/e3sconf/201911101075
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发表时间：
2019-08
影响因子：
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通讯作者：
Junichi Shinoda;O. B. Kazanci;S. Tanabe;B. Olesen
中科院分区：
文献类型：
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作者：
Junichi Shinoda;O. B. Kazanci;S. Tanabe;B. Olesen
传热系数通常用于描述辐射系统的热行为以及它如何在冷却/加热表面和房间之间传递热量。除了目前的标准，已经进行了大量的研究，以获得传热系数通过实验和模拟。然而，建议的值或表达式中存在明显的不一致性。因此，本研究通过对文章和标准进行广泛的文献综述，重点关注冷却/加热表面的传热系数，调查了可能的差异来源。通过提取不同作者提供的实验数据，比较了不同实验条件下的传热量和实际传热系数。因此，建议的值和表达式被用来预测其他文章中的测量数据，以检查其准确性。结果表明，辐射换热系数的预测值与文献值基本一致，预测误差在± 20%以内。然而，较大的偏差和预测误差被认为是在总传热和对流传热。有人认为，一些误差来源可能是每个传热机制的计算程序，参考温度的选择及其测量高度/位置，以及房间尺寸。
Heat transfer coefficients are often used to describe the thermal behaviour of radiant systems and how it transfers heat between the cooled/heated surface and the room. In addition to current standards, numerous studies have been conducted to obtain the heat transfer coefficients through experiments and simulations. However, inconsistency is evident in the values or expressions suggested. Thus, this study investigated possible sources of discrepancy through an extensive literature review on articles and standards that focused on the heat transfer coefficients at the cooled/heated surface. Measurement data provided by different authors were extracted to compare both the amount of heat transfer and the actual heat transfer coefficients. Consequently, suggested values and expressions were used to predict the measurement data in other articles to examine their accuracy. Comparison of the results showed that the radiant heat transfer coefficients had a consistent value throughout the literature and had prediction error within ±20%. However, larger deviations and prediction errors were seen in the total and convective heat transfer. It was suggested that some of the sources of error may have been the calculation procedure of each heat transfer mechanism, choice of reference temperature and its measurement height/position, and room dimensions.