Journal
ENERGY AND BUILDINGS
Volume 109, Issue -, Pages 353-360Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.enbuild.2015.09.074
Keywords
Shape-stabilized phase change materials; Expanded graphite; Low melting point; Thermal energy storage; Thermal conductivity
Funding
- National Basic Research Program of China [2013CB932500]
- National Natural Science Foundation of China [51276114, 21171117, 61376003]
- Program for New Century Excellent Talents in University [NCET-12-0356]
- Program of Shanghai Academic/Technology Research Leader [15XD1525200]
- Program for Professor of Special Appointment (Eastern Scholar) at Shanghai Institutions of Higher Learning
- Instrumental Analysis Center of Shanghai Jiao Tong University
- Center for Advanced Electronic Materials and Devices of Shanghai Jiao Tong University
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Despite the well-known properties of organic phase change materials (PCMs), drawbacks including high phase transformation point, fluid leakage, and low thermal conductivity limit their practical applications. In this study, a kind of PCMs with low melting point (below 25 degrees C) was prepared using capric and lauric acid as substrates with additive oleic acid (C-L-O acid). C-L-O acid was then impregnated into worm-like expanded graphite (EG) to form the shape-stabilized PCMs (SPCMs) without any chemical reaction. EG was used to be not only a heat transfer intensifier, but also a shape-stabilized container for C-L-O acid. The melting enthalpy (Delta H-m) of the SPCMs (mass ratio of EG to C-L-O acid was 1:35) was calculated to be 114.65 J/g, which was extremely close to the value of original C-L-O acid (115.91 J/g). The thermal conductivity of the SPCMs (1:5) was measured to be 3.15 W/m K, which was 22.5 times higher than that of original acid (0.14W/m K). The SPCMs also showed good thermal reliability after thermal treatment cycles measurements. With consideration of latent heat and thermal conductivity, the SPCMs (1:15) were eventually selected as the optimal SPCMs with their Delta H-m of 109.18 J/g and thermal conductivity of 1.95 W/m K. These composite SPCMs can be easily mass prepared and further used as potential materials for practical radiant cooling system. (C) 2015 Elsevier B.V. All rights reserved.
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