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Title: Analytical solutions for combined close-contact and natural convection melting in horizontal cylindrical heat storage capsule

Abstract

Melting and solidification of a phase change material (PCM) in a capsule is of practical importance in latent heat thermal energy storage (LHTES) systems which are considered to be very promising to reduce a peak demand of electricity in the summer season and carbon dioxide (CO{sub 2}) emissions. Two melting modes are involved in melting of capsules. One is close-contact melting between the solid bulk and the capsule wall, and another is natural convection melting in the liquid region. Close-contact melting processes for a single enclosure have been solved using several numerical methods (e.g., Saitoh and Kato (1994)). In addition close-contact melting heat transfer characteristics including melt flow in the liquid film under inner wall temperature distribution were analyzed and simple approximate equations were already presented by Saitoh and Hoshi (1997). The effects of Stefan number and variable temperature profile etc. were clarified in detail. And the melting velocity of the solid bulk under various conditions was also studied theoretically. In addition the effects of variable inner wall temperature on molten mass fraction were investigated. The present paper reports analytical solutions for combined close-contact and natural convection melting in horizontal cylindrical capsule. Moreover, natural convection melting in the liquid regionmore » were analyzed in this report. The upper interface shape of the solid bulk is approximated by a circular arc throughout the melting process. For the sake of verification, close-contact melting heat-transfer characteristics including natural convection in the liquid region were studied experimentally. Apparent shift of upper solid-liquid interface is good agreement with the experiment. The present simple approximate solutions will be useful to facilitate designing of the practical capsule bed LHTES systems.« less

Authors:
;
Publication Date:
Research Org.:
Tohoku Univ., Sendai (JP)
OSTI Identifier:
20000377
Resource Type:
Conference
Resource Relation:
Conference: 33rd Intersociety Energy Conversion Engineering Conference, Colorado Springs, CO (US), 08/02/1998--08/06/1998; Other Information: 1 CD-ROM. Operating system required: Windows 3.x; Windows95/NT; Macintosh; UNIX. All systems need 2X CD-ROM drive., PBD: 1998; Related Information: In: Proceedings of the 33. intersociety energy conversion engineering conference, by Anghaie, S. [ed.], [2800] pages.
Country of Publication:
United States
Language:
English
Subject:
32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION; 25 ENERGY STORAGE; LOAD MANAGEMENT; LATENT HEAT STORAGE; PHASE CHANGE MATERIALS; MELTING; SOLIDIFICATION; HEAT TRANSFER; NATURAL CONVECTION; ANALYTICAL SOLUTION; DESIGN; THERMAL ENERGY STORAGE EQUIPMENT

Citation Formats

Saitoh, T S, and Hoshi, A. Analytical solutions for combined close-contact and natural convection melting in horizontal cylindrical heat storage capsule. United States: N. p., 1998. Web.
Saitoh, T S, & Hoshi, A. Analytical solutions for combined close-contact and natural convection melting in horizontal cylindrical heat storage capsule. United States.
Saitoh, T S, and Hoshi, A. Wed . "Analytical solutions for combined close-contact and natural convection melting in horizontal cylindrical heat storage capsule". United States.
@article{osti_20000377,
title = {Analytical solutions for combined close-contact and natural convection melting in horizontal cylindrical heat storage capsule},
author = {Saitoh, T S and Hoshi, A},
abstractNote = {Melting and solidification of a phase change material (PCM) in a capsule is of practical importance in latent heat thermal energy storage (LHTES) systems which are considered to be very promising to reduce a peak demand of electricity in the summer season and carbon dioxide (CO{sub 2}) emissions. Two melting modes are involved in melting of capsules. One is close-contact melting between the solid bulk and the capsule wall, and another is natural convection melting in the liquid region. Close-contact melting processes for a single enclosure have been solved using several numerical methods (e.g., Saitoh and Kato (1994)). In addition close-contact melting heat transfer characteristics including melt flow in the liquid film under inner wall temperature distribution were analyzed and simple approximate equations were already presented by Saitoh and Hoshi (1997). The effects of Stefan number and variable temperature profile etc. were clarified in detail. And the melting velocity of the solid bulk under various conditions was also studied theoretically. In addition the effects of variable inner wall temperature on molten mass fraction were investigated. The present paper reports analytical solutions for combined close-contact and natural convection melting in horizontal cylindrical capsule. Moreover, natural convection melting in the liquid region were analyzed in this report. The upper interface shape of the solid bulk is approximated by a circular arc throughout the melting process. For the sake of verification, close-contact melting heat-transfer characteristics including natural convection in the liquid region were studied experimentally. Apparent shift of upper solid-liquid interface is good agreement with the experiment. The present simple approximate solutions will be useful to facilitate designing of the practical capsule bed LHTES systems.},
doi = {},
url = {https://www.osti.gov/biblio/20000377}, journal = {},
number = ,
volume = ,
place = {United States},
year = {1998},
month = {7}
}

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