Thermal Performance of Residential Roofs in Malaysia: Experimental Study Using an Indoor Solar Simulator

IF 3.1 3区工程技术 Q2 CONSTRUCTION & BUILDING TECHNOLOGY

Buildings Pub Date : 2024-01-10 DOI:10.3390/buildings14010178

Muhamad Zahin Mohd Ashhar, Chin Haw Lim

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Abstract

Previous researchers have detailed the problems in measuring the thermal resistance value of a whole roof assembly under hot conditions due to the uncertainty of the outdoor environment. Currently, no established method exists to experimentally investigate an entire thermal roof performance under a steady-state condition. This article details the properties of the indoor solar simulator and the research methods undertaken to measure the thermal resistance value of roof assembly. The indoor solar simulator utilizes 40 halogen bulbs to accurately replicate sun radiation. Thermocouples and heat flux sensors are installed at several locations on the roof assembly to quantify the heat transmission occurring through it. The thermal resistance value is determined by adding up the average difference in temperature across the external and internal roof surfaces and dividing the total amount by the total of all averaged heat fluxes. Subsequently, this study investigates the thermal efficiency of residential roof assemblies that comprise various insulation materials frequently employed in Malaysia, including stone wool, mineral glass wool, reflective bubble foil insulation, and radiant barriers. The analysis showed that the roof configurations with bubble foil reflective insulation produce superior thermal resistance values when coupled with enclosed air space or mass insulation, with thermal resistance values ranging between 2.55 m2K/W and 3.22 m2K/W. It can be concluded that roof configurations with bubble foil reflective insulation resulted in high total thermal resistance and passed the minimum thermal resistance value of 2.5 m2K/W under the Malaysian Uniform Building By-Law 38 (A) requirements. Furthermore, the radiant barrier produced a high thermal resistance value of 2.50 m2K/W when installed parallel to a 50 mm enclosed air space, emphasising the crucial function of an enclosed air space next to a reflective foil to resist the incoming heat radiation. The findings from this research can help building professionals determine the optimum insulation for residential building roofs in Malaysia.

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马来西亚住宅屋顶的热性能：使用室内太阳能模拟器进行的实验研究

由于室外环境的不确定性，以往的研究人员详细阐述了在高温条件下测量整个屋顶组件热阻值的问题。目前，还没有成熟的方法来实验研究整个热屋顶在稳态条件下的性能。本文详细介绍了室内太阳模拟器的特性以及测量屋顶组件热阻值的研究方法。室内太阳模拟器使用 40 个卤素灯泡来精确复制太阳辐射。热电偶和热通量传感器安装在屋顶组件的多个位置，以量化通过屋顶组件发生的热传导。热阻值的计算方法是将屋顶内外表面的平均温差相加，再除以所有平均热通量的总和。随后，本研究调查了由马来西亚常用的各种隔热材料（包括岩棉、矿物玻璃棉、反射泡泡箔隔热材料和辐射屏障）组成的住宅屋顶组件的热效率。分析表明，采用气泡箔反射隔热材料的屋顶结构在与封闭的空气空间或大规模隔热材料结合使用时，能产生更优越的热阻值，热阻值介于 2.55 m2K/W 和 3.22 m2K/W 之间。由此可以得出结论，采用气泡箔反射隔热材料的屋顶结构具有较高的总热阻，并通过了马来西亚统一建筑附则第 38 (A) 条规定的最低热阻值 2.5 m2K/W。此外，当辐射隔热层与 50 毫米的封闭空气空间平行安装时，其热阻值高达 2.50 m2K/W，这强调了反射箔旁边的封闭空气空间对抵御热辐射的关键作用。这项研究的结果可以帮助建筑专业人员确定马来西亚住宅建筑屋顶的最佳隔热材料。

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

Buildings Multiple-

CiteScore

3.40

自引率

26.30%

发文量

1883

审稿时长

11 weeks

期刊介绍： BUILDINGS content is primarily staff-written and submitted information is evaluated by the editors for its value to the audience. Such information may be used in articles with appropriate attribution to the source. The editorial staff considers information on the following topics: -Issues directed at building owners and facility managers in North America -Issues relevant to existing buildings, including retrofits, maintenance and modernization -Solution-based content, such as tips and tricks -New construction but only with an eye to issues involving maintenance and operation We generally do not review the following topics because these are not relevant to our readers: -Information on the residential market with the exception of multifamily buildings -International news unrelated to the North American market -Real estate market updates or construction updates