Thermal behavior of encapsulated phase change material energy storage

Al-Kayiem, Hussain H.; Alhamdo, Mohammed H.

doi:doi:10.1063/1.3683532

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Journal of Renewable and Sustainable Energy / Volume 4 / Issue 1 / REGULAR ARTICLES

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J. Renewable Sustainable Energy 4, 013112 (2012); http://dx.doi.org/10.1063/1.3683532 (13 pages)

Thermal behavior of encapsulated phase change material energy storage

Hussain H. Al-Kayiem¹ and Mohammed H. Alhamdo²

¹Mechanical Engineering Department, Universiti Teknologi PETRONAS, Bandar Seri Iskandar, 31750 Tronoh, Malaysia
²Mechanical Engineering Department, College of Engineering, Al-Mustansiriya University, Baghdad, Iraq

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(Received 21 August 2011; accepted 17 January 2012; published online 10 February 2012)

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Abstract

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Related Content

The performance of thermal solar systems can be enhanced by extending its operational time by the aid of thermal energy storage. In the present work, the transient behavior of packed bed thermal energy storage (TES) was investigated experimentally and numerically. An experimental setup was designed and fabricated to simulate the charging and discharging operational modes of the system. 101 spherical capsules were filled with wax paraffin as PCM and packed in cylindrical container bed of 105 mm diameter and 420 mm long. The processes of the experimented storage system were simulated mathematically and solved numerically by finite difference technique. The analyses were carried out at two different mass velocity of the working fluid. The numerical model described the transient behavior of the system and it was in acceptable agreement with the experimental results. The transient period in the charging mode of the tested storage was around 30 min, while the energy recovery period in the discharging mode was around 60 min. The achieved results demonstrated that the tested TES could be used to enhance the performance of the thermal solar systems. The proposed packed bed thermal energy storage is easy to implement with low cost.

Article Outline

INTRODUCTION
MODELING OF ENCAPSULATED PCES
1. Enclosure geometry
2. Mathematical modeling
  1. Thermal energy balance within the working fluid
  2. Thermal energy balance within the PCM
NUMERICAL IMPLEMENTATION
EXPERIMENTAL SETUP AND PROCEDURE
1. Single enclosure tests
2. Packed bed experiments
RESULTS AND DISCUSSION
CONCLUSION

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KEYWORDS, PACS, and IPC

Keywords

encapsulation, heat transfer, phase change materials, solar energy conversion, thermal energy storage

PACS

84.60.-h

Direct energy conversion and storage
88.40.-j

Solar energy

International Patent Classification (IPC)

F28D20/00
Heat storage plants or apparatus in general; Regenerative heat-exchange apparatus not covered by groups F28D17/00 or F28D19/00
F28
Heat exchange in general

ARTICLE DATA

Digital Object Identifier

http://dx.doi.org/10.1063/1.3683532

PUBLICATION DATA

ISSN

1941-7012 (online)

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American Institute of Physics

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