期刊
ENERGY AND BUILDINGS
卷 61, 期 -, 页码 239-249出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.enbuild.2013.02.032
关键词
Phase change materials (PCM); Thermal properties; Optical properties; Phase change and radiation modelling; PCM-glass unit
资金
- UK Engineering and Physical Sciences Research Council (EPSRC) [EP/H004181/1]
- Engineering and Physical Sciences Research Council [EP/H004181/1] Funding Source: researchfish
- EPSRC [EP/H004181/1] Funding Source: UKRI
This paper reports on the thermal and optical characterisation of PCM (phase change material) RT27 using the T-history method and spectrophotometry principles, respectively, and the experimental and numerical performance evaluation of a PCM-glazed unit. Various relationships describing the variations in the extinction, scattering and absorption coefficients within the phase change region were developed, and were validated in a numerical CFD model. The results show that: (i) during rapid phase changes, the transmittance spectra from the PCM are unstable, while under stable conditions visible transmittance values of 90% and 40% are obtained for the liquid and phases, respectively; (ii) the radiation scattering effects are dominant in the solid phase of the PCM, while radiation absorption dominates in the liquid phase; (iii) the optical/radiation performance of PCM can be successfully modelled using the liquid fraction term as the main variable; (iv) the addition of PCM improves the thermal mass of the unit during phase change, but risks of overheating may be a significant factor after the PCM has melted; (v) although the day-lighting aspects of PCM-glazed units are favourable, the change in appearance as the PCM changes phase may be a limiting factor in PCM-glazed units. (c) 2013 Elsevier B.V. All rights reserved.
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