Journal
ENERGY AND BUILDINGS
Volume 127, Issue -, Pages 603-610Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.enbuild.2016.06.031
Keywords
Eutectic phase change material; Carbon nanotubes; Thermal properties; Thermal conductivity enhancement; Thermal energy storage
Funding
- National Natural Science Foundation of China [51376087]
- Priority Academic Program Development of Jiangsu Higher Education Institutions
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Myristic-stearic acids (MA-SA) binary eutectics with appropriate phase change temperature were prepared based on theoretical calculation. The melting temperature of the MA-SA eutectics and the mass fraction of the myristic acid (MA) in the eutectic mixtures are 42.70 degrees C and 54%, which was measured by Different Scanning Calorimeter (DSC). In order to enhance the thermal conductivity of the MA-SA eutectics, the carbon nanotubes (CNTs) were added into the MA-SA eutectics, and the effects of the CNTs on thermal conductivity of the MA-SA eutectics were investigated experimentally. The minimum mass fraction of the CNTs in the composite PCMs (CPCMs) was determined to be 9% without stratification. The thermal properties and microstructure of the CPCMs were investigated by the DSC and scanning electron microscopy (SEM), respectively. The DSC results showed that the CPCMs exhibited the similar solid-liquid phase change properties as the MA-SA eutectics, and the supercooling degrees of the CPCMs decrease obviously with an increase of the CNTs Content in the CPCMs. The thermal conductivity Meter (TCM) was used to measure the thermal conductivities of the CPCMs, and the test results indicated that the thermal conductivities of the CPCMs increase significantly from 0.173 W/(m K) to 0.213 W/(m K), 0.258 W/(m K) and 0.283 W/(m K) as the mass fractions of the CNTs in the CPCMs were 9 wt.%, 12 wt.% and 15 wt.%. The CPCMs with enhanced thermodynamic property will contribute to the energy management and storage in building systems. (C) 2016 Elsevier B.V. All rights reserved.
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