期刊
APPLIED ENERGY
卷 185, 期 -, 页码 107-118出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.apenergy.2016.10.072
关键词
Macro-encapsulated phase change material; Hollow steel ball; Performance improvement; Elevated temperature test; Thermal performance; Thermal energy storage capacity
资金
- Natural Science Foundation of China [51372155, 51678367]
- Australian Research Council Discovery Project [G1500225]
Phase change materials (PCMs) have great potential for applications in energy efficient buildings. In this study, an innovative method of macro-encapsulation of PCM using hollow steel balls (HSB) was developed and the thermal and mechanical performance of PCM-HSB concrete was examined. The macro encapsulation system (PCM-HSB) was attached with a metal clamp (c) for better mechanical interlocking with the mortar matrix. The latent heat of PCM-HSB-c that can be acquired is approximately 153.1 J/g, which can be considered to rank highly among PCM composites. According to the self-designed thermal performance evaluation, the PCM HSB-c concrete panel is capable of reducing and deferring the peak indoor temperature. The indoor temperature of the room model using PCM-HSB-c panels was significantly lower than the ones with normal concrete panels by a range of 3-6%. Furthermore, the test room using a higher PCM-HSB-c content demonstrated a greater ability to maintain a lower indoor room temperature for a longer period of time during heating cycles. In consideration of the mechanical properties, thermal performance and other aspects of cost factors, 50% and 75% PCM-HSB-c replacement levels are recommended in producing concrete. (C) 2016 Elsevier Ltd. All rights reserved.
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