Research Papers

Application of Fatty Acid Based Phase-Change Material to Reduce Energy Consumption From Roofs of Buildings

[+] Author and Article Information
Ahmad K. Sleiti

Associate Professor of Mechanical Engineering
Mechanical and Industrial
Engineering Department,
College of Engineering-Qatar University,
P. O. Box 2713,
Doha 2713, Qatar
e-mail: asleiti@qu.edu.qa

Edward J. Naimaster, IV

899 North Orange Avenue,
Apt. 210
Orlando, FL 32801
e-mail: ej.naimaster@gmail.com

1Corresponding author.

Contributed by the Solar Energy Division of ASME for publication in the JOURNAL OF SOLAR ENERGY ENGINEERING: INCLUDING WIND ENERGY AND BUILDING ENERGY CONSERVATION. Manuscript received September 17, 2015; final manuscript received March 14, 2016; published online June 27, 2016. Assoc. Editor: Jorge E. Gonzalez.

J. Sol. Energy Eng 138(5), 051003 (Jun 27, 2016) (7 pages) Paper No: SOL-15-1308; doi: 10.1115/1.4033574 History: Received September 17, 2015; Revised March 14, 2016

Buildings account for a significant portion of the total energy consumption in the U.S., especially the energy-inefficient commercial building sector. As part of the future path toward realizing net zero energy buildings, innovative energy-efficient technologies must be developed. In this study, the potential of phase-change material (PCM)-enhanced constructions to lower heating, ventilating, and air conditioning (HVAC) energy consumption in a commercial restaurant building was investigated. A commercially available fatty acid based PCM product was selected due to their promising thermal and chemical properties. Differential scanning calorimetry (DSC) was used in isothermal step mode to accurately measure the latent heat energy storage of the PCM. A U.S. Department of Energy (DOE) commercial reference building model with a PCM-enhanced ceiling was simulated using a finite-difference conduction heat transfer algorithm in EnergyPlus to determine the effects of the PCM on the building energy performance. It was found that, although the PCM-enhanced ceiling had a beneficial stabilizing effect on the interior surface temperature of the ceiling, the zone mean air temperatures were not significantly altered. As such, minimal HVAC energy savings were seen. Future work should focus on active PCM systems, which utilize heat exchanging fluids to discharge the PCM to remove the stored thermal energy of the PCM during the night in summer, overcoming the fundamental issue of the passive PCM system returning stored thermal energy back into the building.

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Fig. 1

QSR model geometry [12]

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Fig. 2

PCM-enhanced ceiling construction

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Fig. 3

One-dimensional finite-difference conduction heat transfer nodes [20]

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Fig. 4

PCM energy storage during heating

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Fig. 5

PCM enthalpy profile

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Fig. 6

Dining ceiling inside surface temperature during winter

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Fig. 7

Dining ceiling inside surface temperature during summer

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Fig. 8

Dining zone mean air temperature during winter

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Fig. 9

Dining zone mean air temperature during summer



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