Research Papers

Energy-Saving Evaluation of SOFC Cogeneration Systems With Solar Cell and Battery

[+] Author and Article Information
Akira Yoshida

Graduate School of Fundamental Science and
Waseda University,
3-4-1 Okubo, Shinjuku-ku,
Tokyo 169-8555, Japan
e-mail: yoshida@power.mech.waseda.ac.jp

Koichi Ito

Fellow ASME
Research Institute for Science and Engineering,
Waseda University,
3-4-1 Okubo, Shinjuku-ku,
Tokyo 169-8555, Japan
e-mail: k.ito8@kurenai.waseda.jp

Yoshiharu Amano

Research Institute for Science and Engineering,
Waseda University,
17 Kikui-cho, Shinjuku-ku,
Tokyo 162-0044, Japan
e-mail: yoshiha@waseda.jp

1Corresponding author.

Contributed by the Advanced Energy Systems Division of ASME for publication in the JOURNAL OF FUEL CELL SCIENCE AND TECHNOLOGY. Manuscript received May 9, 2014; final manuscript received August 4, 2014; published online November 14, 2014. Assoc. Editor: Dr Masashi Mori.

J. Fuel Cell Sci. Technol 11(6), 061006 (Dec 01, 2014) (7 pages) Paper No: FC-14-1061; doi: 10.1115/1.4028948 History: Received May 09, 2014; Revised August 04, 2014; Online November 14, 2014

The purpose of this study is to evaluate the maximum energy-saving potential of residential energy supply systems consisting of a solid oxide fuel cell (SOFC) cogeneration system (CGS) combined with a solar cell (SC) and a battery (BT), compared with a reference system (RS). This study applies an optimization theory into an operational planning problem to measure actual energy demands over the course of 1 year. Eight different types of energy supply system were compared with each other by changing the components of the SOFC-CGS, SC, BT, and RS. Meaningful numerical results are obtained, indicating the maximum potential energy savings.

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Fig. 1

SOFC-CGS with SC and BT

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Fig. 3

Daily average energy demands in each month

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Fig. 4

Performance characteristics of SOFC

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Fig. 5

Characteristic values of several pieces of equipment

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Fig. 6

Daily average power output from SC (1 kW) in each month

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Fig. 7

Annual energy-saving ratio of each system, compared to RS

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Fig. 8

Annual power-supply ratio of each source relative to electricity demand

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Fig. 9

Monthly energy-saving ratio of each system, compared to RS

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Fig. 10

Monthly operational hour rate of SOFC

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Fig. 11

Monthly load factor of SOFC

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Fig. 12

Daily energy-saving ratio of SOFC-CGS, compared to RS

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Fig. 13

Daily optimal operation of each system (Aug. 7th)




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