A review of the surface heat transfer coefficients of radiant heating and cooling systems
A review of the surface heat transfer coefficients of radiant heating and cooling systems
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DOI：
10.1016/j.buildenv.2019.05.034
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发表时间：
2019-07
影响因子：
7.4
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建筑物中辐射系统的热行为以及它们如何在其冷却/加热表面和房间之间传递热量。除了目前的标准，已经进行了几项研究，以确定这样的传热系数通过实验和模拟。在为此目的推导的值和表达式中，明显存在不一致性。本研究调查了可能的来源的差异，在广泛的文献综述的文章，标准和指南，重点是冷却/加热表面的传热系数。对不同作者提供的测量数据进行了分析，以比较传热量和传热系数的估计值。用这些估计值和表达式预测其他文献中的实测数据，检验其准确性。总传热量和对流传热量的偏差和预测误差大于辐射传热量，辐射传热量的误差范围在±20%以内。误差的主要来源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和位置，以及房间尺寸。建议应通过使获得传热系数的计算/测量条件与应用传热系数的目的和条件相匹配来选择传热系数。
Heat transfer coefficients are often used to describe the thermal behavior of radiant systems in buildings and how they transfer heat between their cooled/heated surfaces and the room. In addition to current standards, several studies have been conducted to determine such heat transfer coefficients by means of experiments and simulations. Inconsistency is evident in the values and expressions derived for this purpose. The present study investigated possible sources of discrepancy in an extensive literature review of articles, standards and guidelines that focus on the heat transfer coefficients of cooled/heated surfaces. Measurement data provided by different authors were analyzed to compare both the amount of heat transfer and the estimated heat transfer coefficients. These estimated values and expressions were used to predict the measured data reported in other articles, to examine their accuracy. Larger deviations and prediction errors were found in the total and convective heat transfer values than in radiant heat transfer, which had a range of errors within ±20% throughout the literature. The major sources of error were shown to be the calculation procedure for each heat transfer mechanism, the choice of reference temperature and its measurement height and position, and room dimensions. It is suggested that heat transfer coefficients should be chosen by matching the calculation/measurement conditions in which they were obtained to the purpose and conditions in which they will be applied.