Assessment of the Thermal Performance of Non-residential Building Envelope Prototype Specimens Insulated with Porous Cementitious Nanocomposites Containing Phase Change Materials, Using a Hot Box Apparatus

IF 2.5 4区 工程技术 Q3 CHEMISTRY, PHYSICAL
Benjamin A. Tourn, Christina Strunz, Juan C. Álvarez Hostos, Cornelia Stark, Barbara Klemczak
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引用次数: 0

Abstract

The NRG-STORAGE project aimed to develop innovative, energy-efficient cementitious foams (NRG-Foams) as a sustainable alternative to conventional insulation materials for non-residential building envelopes. NRG-Foams were designed to balance thermal insulation and heat storage capacity while maintaining volume stability and mechanical integrity. The base material consists of a highly conductive cement paste with air bubbles that provide insulating properties. Enhanced heat storage performance is achieved by incorporating microencapsulated phase change materials (MPCM). This study evaluates the thermal performance of wall prototypes constructed from masonry bricks or concrete, insulated with NRG-Foam panels containing MPCM volume fractions ranging from 0% to 20%. Key thermal indicators—including thermal transmittance, decrement factor, time lag, periodic thermal transmittance, energy savings, and dynamic thermal resistance—were assessed using a NETZSCH HotBox Test Chamber TDW 4040 under both steady-state and dynamic conditions. While thermal performance improved progressively with increasing MPCM content, reaching a maximum at 20% MPCM, it did not surpass the performance of specimens with standard insulation materials. Nevertheless, the findings highlight significant potential for further optimization, particularly with higher MPCM volume fractions. Such enhancements could enable NRG-Foams to outperform conventional insulation materials, especially in long-term thermal analyses conducted under more realistic conditions. In addition, the influence of issues encountered during the experimental procedure on the thermal performance assessment of NRG-Foams is also discussed.

Abstract Image

用热箱仪评价含相变多孔胶凝纳米复合材料保温非住宅建筑围护结构的热性能
NRG-STORAGE项目旨在开发创新、节能的水泥泡沫(nrg - foam),作为非住宅建筑围护结构传统保温材料的可持续替代品。nrg泡沫的设计是为了平衡隔热和蓄热能力,同时保持体积稳定性和机械完整性。基础材料由具有提供绝缘性能的气泡的高导电性水泥膏体组成。通过结合微封装相变材料(MPCM)来增强储热性能。本研究评估了由砖石砖或混凝土建造的墙体原型的热性能,用含有MPCM体积分数从0%到20%的nrg泡沫板进行隔热。使用NETZSCH HotBox测试箱TDW 4040在稳态和动态条件下评估了主要热指标,包括热透射率、衰减系数、时滞、周期性热透射率、节能和动态热阻。随着MPCM含量的增加,热性能逐渐改善,在MPCM含量为20%时达到最大值,但并未超过标准保温材料试样的性能。然而,研究结果强调了进一步优化的巨大潜力,特别是在更高的MPCM体积分数下。这些改进可以使nrg - foam优于传统的隔热材料,特别是在更现实条件下进行的长期热分析中。此外,还讨论了实验过程中遇到的问题对nrg泡沫材料热性能评价的影响。
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来源期刊
CiteScore
4.10
自引率
9.10%
发文量
179
审稿时长
5 months
期刊介绍: International Journal of Thermophysics serves as an international medium for the publication of papers in thermophysics, assisting both generators and users of thermophysical properties data. This distinguished journal publishes both experimental and theoretical papers on thermophysical properties of matter in the liquid, gaseous, and solid states (including soft matter, biofluids, and nano- and bio-materials), on instrumentation and techniques leading to their measurement, and on computer studies of model and related systems. Studies in all ranges of temperature, pressure, wavelength, and other relevant variables are included.
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