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Title: Thermal storage in drywall using organic phase-change material

Abstract

Two mixtures of phase-change material (PCM), 49% butyl stearate with 48% butyl palmitate, and 55% lauric acid with 45% capric acid, diluted 10% with fire retardant, were diffused into 13-mm (0.5-in.) wallboard. No exudation of liquid PCM occurs below 25% by weight. In the wallboard, initial PCM freezing points were 21/sup 0/ and 22/sup 0/C (70/sup 0/ and 72/sup 0/F), respectively, with melting points of 17/sup 0/ and 18/sup 0/C (63/sup 0/ and 64/sup 0/F). For a 4/sup 0/C (7/sup 0/F) temperature swing, thermal storage capacities up to 350 kJ/m/sup 2/ (31 Btu/ft/sup 2/) and 317 kJ/m/sup 2/ (28 Btu/ft/sup 2/), respectively, are available. These are equivalent to about 3.8 cm (1.5 in.) of concrete cycled through 7/sup 0/C (13/sup 0/F). Preliminary tests showed little extra flame spread beyond that of unloaded wallboard. The thermal conductivity of the wallboard increased from 0.19 to 0.22 W/m /sup 0/C (0.11 to 0.13 Btu/h ft /sup 0/F) with liquid PCM. During melting, the effective thermal diffusivity falls from 2.1 x 10/sup -7/ m/sup 2//s (2.3 x 10/sup -6/ ft/sup 2//s) for the unloaded wallboard to 1.4 x 10/sup -7/ m/sup 2//s (1.5 x 10/sup -6/ ft/sup 2//s) with 23.4% butyl stearate-palmitate and tomore » 1.6 x 10/sup -7/ m/sup 2//s (1.7 x 10/sup -6/ ft/sup 2//s) with 28% of the lauric-capric mixture. (The mixture fraction is defined as the ratio of PCM mass to gypsum mass.)« less

Authors:
; ; ;
Publication Date:
Research Org.:
Mendes, Grant Consultants, 4130 Wilson Ave., Montreal, Quebec (CA)
OSTI Identifier:
7007945
Resource Type:
Journal Article
Journal Name:
Passive Sol. J.; (United States)
Additional Journal Information:
Journal Volume: 4:4
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION; PHASE CHANGE MATERIALS; CHEMICAL COMPOSITION; WALLS; HEAT STORAGE; BUILDING MATERIALS; BUTYL RADICALS; DODECANOIC ACID; FABRICATION; STEARATES; THERMAL ENERGY STORAGE EQUIPMENT; THERMODYNAMIC PROPERTIES; ALKYL RADICALS; CARBOXYLIC ACID SALTS; CARBOXYLIC ACIDS; ENERGY STORAGE; EQUIPMENT; MATERIALS; MONOCARBOXYLIC ACIDS; ORGANIC ACIDS; ORGANIC COMPOUNDS; PHYSICAL PROPERTIES; RADICALS; STORAGE; 360603* - Materials- Properties; 320107 - Energy Conservation, Consumption, & Utilization- Building Systems- (1987-)

Citation Formats

Shapiro, M M, Feldman, D, Hawes, D, and Banu, D. Thermal storage in drywall using organic phase-change material. United States: N. p., 1987. Web.
Shapiro, M M, Feldman, D, Hawes, D, & Banu, D. Thermal storage in drywall using organic phase-change material. United States.
Shapiro, M M, Feldman, D, Hawes, D, and Banu, D. 1987. "Thermal storage in drywall using organic phase-change material". United States.
@article{osti_7007945,
title = {Thermal storage in drywall using organic phase-change material},
author = {Shapiro, M M and Feldman, D and Hawes, D and Banu, D},
abstractNote = {Two mixtures of phase-change material (PCM), 49% butyl stearate with 48% butyl palmitate, and 55% lauric acid with 45% capric acid, diluted 10% with fire retardant, were diffused into 13-mm (0.5-in.) wallboard. No exudation of liquid PCM occurs below 25% by weight. In the wallboard, initial PCM freezing points were 21/sup 0/ and 22/sup 0/C (70/sup 0/ and 72/sup 0/F), respectively, with melting points of 17/sup 0/ and 18/sup 0/C (63/sup 0/ and 64/sup 0/F). For a 4/sup 0/C (7/sup 0/F) temperature swing, thermal storage capacities up to 350 kJ/m/sup 2/ (31 Btu/ft/sup 2/) and 317 kJ/m/sup 2/ (28 Btu/ft/sup 2/), respectively, are available. These are equivalent to about 3.8 cm (1.5 in.) of concrete cycled through 7/sup 0/C (13/sup 0/F). Preliminary tests showed little extra flame spread beyond that of unloaded wallboard. The thermal conductivity of the wallboard increased from 0.19 to 0.22 W/m /sup 0/C (0.11 to 0.13 Btu/h ft /sup 0/F) with liquid PCM. During melting, the effective thermal diffusivity falls from 2.1 x 10/sup -7/ m/sup 2//s (2.3 x 10/sup -6/ ft/sup 2//s) for the unloaded wallboard to 1.4 x 10/sup -7/ m/sup 2//s (1.5 x 10/sup -6/ ft/sup 2//s) with 23.4% butyl stearate-palmitate and to 1.6 x 10/sup -7/ m/sup 2//s (1.7 x 10/sup -6/ ft/sup 2//s) with 28% of the lauric-capric mixture. (The mixture fraction is defined as the ratio of PCM mass to gypsum mass.)},
doi = {},
url = {https://www.osti.gov/biblio/7007945}, journal = {Passive Sol. J.; (United States)},
number = ,
volume = 4:4,
place = {United States},
year = {1987},
month = {1}
}