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RESEARCH PAPERS

Development of Heat-Storage System Using Metal Hydraid: Experiment of Performance by the Actual Loading Condition

[+] Author and Article Information
Takami Koseki

 Sanki Engineering Co., Ltd., 1742-7 Shimotsuruma, Yamato-shi, Kanagawa 242-0001, Japantakami̱koseki@eng.sanki.co.jp

Harunobu Takeda, Masamitu Murai

 The Japan Steel Works, Ltd., Hokkaido, Japan

Kazuaki Iijima, Hisayoshi Matsufuji

 Sanki Engineering Co., Ltd., 1742-7 Shimotsuruma, Yamato-shi, Kanagawa 242-0001, Japan

Osamu Kawaguchi

 Keio University, Kanagawa, Japan

J. Sol. Energy Eng 128(3), 376-382 (Dec 28, 2005) (7 pages) doi:10.1115/1.2210492 History: Received April 29, 2004; Revised December 28, 2005

The application of an innovative heat-storage system with metal hydride to building air-conditioning is investigated. Metal hydrides characteristically generate heat through the absorption process and absorb heat through the desorption process, allowing the development of a new air-conditioning system without chlorofluorocarbons. The trial system is composed of two heat-storage vessels, a “shell-and-tube-type” heat exchanger built with heat transfer fins and filled with metal hydride, and a compressor equipped for hydrogen transfer. The purpose of heat storage is to decrease the difference between electric power demand in the daytime and at night. This system transfers hydrogen using electric power at night and reverses the reaction during the day using only the pressure difference between two heat-storage vessels. The experimental results indicate that heat-storage is attained within a limited time, and the heat-storage quantity is 13.5MJ, which is sufficient for the heat capacity to cool the 10m2 room for 3hr. The stored heat per unit metal hydride volume is 289MJm3, which is sufficiently higher than the conventional system using water or ice. In addition, the coefficient of performance of the system is 2.44.

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Copyright © 2006 by American Society of Mechanical Engineers
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Figures

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Figure 1

Daily load curve (Aug. 25 2000)

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Figure 2

Concept of the basic heat storage system: (a) night process for heat storage and (b) daytime process for load operation

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Figure 3

Pressure and temperature diagram of MH A and B

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Figure 4

PCT diagram of MHA and MHB by material test

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Figure 5

Experimental heat-storage system, Water temperature measurement point (gray circle). Under heat storage operation (solid line) (a) cold water inlet, (b) hot water outlet, (c) hot water inlet, and (d) cold water outlet. Under cooling operation (dotted line): (a) cold water outlet, (b) cold water inlet, (c) hot water outlet, and (d) hot water inlet.

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Figure 6

Heat-storage vessel

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Figure 7

Temperature of water under load operation

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Figure 8

Water flow rate under load operation

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Figure 9

Pressure and hydrogen flow rate under load operation

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Figure 10

PCT diagram of lord operation at daytime

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Figure 11

Hydrogen transfer quantity

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Figure 12

PCT diagram of heat-storage operation at night

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