Journal
ENERGY AND BUILDINGS
Volume 145, Issue -, Pages 238-250Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.enbuild.2017.03.046
Keywords
Admittance method; Decrement factor; Phase change materials
Funding
- California Energy Commission [PIR:-12-032]
- National Science Foundation [CMMI: 1130028]
- University of California, Los Angeles (UCLA)
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This paper extends the admittance method to predict the diurnal energy flux reduction Er associated with adding microencapsulated phase change materials (PCMs) to single and multilayer building envelopes. The effects of phase change on the thermal load through composite building walls were accounted for by modifying the decrement factor f(Am) and time lag phi(Am). The procedure was demonstrated for single and multilayer PCM-composite walls subjected to a constant indoor temperature and to (i) a sinusoidal solair outdoor temperature, (ii) a non-sinusoidal idealized sol-air temperature, or (iii) a sol-air temperature based on weather data for three different days in California climate zone 9 (Los Angeles, CA). In all cases, the analytical results for the daily thermal load passing through PCM-composite walls agreed very well with those predicted using detailed finite element simulations. The computational speed and simplicity of this procedure can enable straightforward evaluation of the energy benefits of PCM-composite walls via user-friendly design tools and platforms. (C) 2017 Elsevier B.V. All rights reserved.
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