Surface temperature distribution prediction model for prefabricated ceiling radiant panel

IF 6.6 2区 工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY
Mingwu Tang, Xiaozhou Wu, Yunfeng Wang, Dong Liu, Jun Wang, Zhong Li, Airong Feng, Xiangli Li
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Abstract

Prefabricated ceiling radiant panel is one type of efficient and lightweight radiant heating and cooling terminal, which has been widely used in many commercial and residential buildings. The surface temperature distribution of radiant terminal is a crucial factor that affects the local thermal discomfort for heating and the surface condensation risk for cooling. However, the existing research on surface temperature distribution lacked a correlation with the average surface temperature prediction model, which was not convenient for guiding the design and control of radiant heating and cooling systems. Therefore, this paper proposed a new simplified model of radiant panels, and the calculation errors of heat transfer and average surface temperature were within ±5 % and ±1 %, respectively. Furthermore, a surface temperature distribution prediction model was established, and the definition of surface temperature uniformity was also determined through derivation. The calculation results indicated that the root mean square error between the predicted surface temperatures at each measurement point and experimental values was 0.8 °C for heating and 0.4 °C for cooling, and the corresponding relative errors of surface temperature uniformity were 5.7 % and 8.9 %. Finally, the effects of water supply temperature, water mass flow rate, pipe spacing, pipe diameter and thickness of heat distribution plate on the surface temperature distribution were quantitatively analyzed. The results showed that the water mass flow rate, pipe spacing (more than 150 mm) and the thickness of the heat distribution plate clearly influenced the surface temperature uniformity.
预制天花板辐射板是一种高效、轻质的辐射供暖和制冷终端,已在许多商业和住宅建筑中得到广泛应用。辐射终端的表面温度分布是影响采暖局部热不适和制冷表面冷凝风险的关键因素。然而,现有的表面温度分布研究缺乏与平均表面温度预测模型的相关性,不便于指导辐射供暖和制冷系统的设计和控制。因此,本文提出了一种新的辐射板简化模型,其传热系数和平均表面温度的计算误差分别在±5%和±1%以内。此外,还建立了表面温度分布预测模型,并通过推导确定了表面温度均匀性的定义。计算结果表明,各测点的预测表面温度与实验值之间的均方根误差为:加热 0.8 ℃,冷却 0.4 ℃,相应的表面温度均匀性相对误差为 5.7 % 和 8.9 %。最后,定量分析了供水温度、水的质量流量、管道间距、管道直径和散热板厚度对表面温度分布的影响。结果表明,水的质量流量、管道间距(大于 150 毫米)和热分布板的厚度明显影响表面温度的均匀性。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Energy and Buildings
Energy and Buildings 工程技术-工程:土木
CiteScore
12.70
自引率
11.90%
发文量
863
审稿时长
38 days
期刊介绍: An international journal devoted to investigations of energy use and efficiency in buildings Energy and Buildings is an international journal publishing articles with explicit links to energy use in buildings. The aim is to present new research results, and new proven practice aimed at reducing the energy needs of a building and improving indoor environment quality.
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