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Verification Test of High Differential Pressure Water Electrolysis-type Solar Hydrogen Station (SHS2)

Article of Honda R&D Technical Review Vol.24 No.2

Summary

A high differential pressure water electrolysis-type solar hydrogen station (SHS2) was developed, envisioned for household use, and verification tests were conducted for approximately one year with production of hydrogen used by fuel cell electric vehicles. This SHS2 unit is equipped with a high differential pressure water electrolysis stack that raises the pressure of the hydrogen produced by water electrolysis to 35 MPa, enabling supply of the hydrogen to fuel cell electric vehicles. This technology has obviated the need for a mechanical compressor to compress the hydrogen, and has achieved low noise, high efficiency, and compactness.
As a result of the verification tests, it was found that the amount of hydrogen produced in one year was approximately 120 kg, and the amount of electric power needed for production was fully supplied by solar cells. The initial system efficiency was 55.5%, and 6.38 kWh of electric power was consumed per 1 Nm3 of hydrogen. Increased efficiency and other such work on the stack and device is anticipated to allow system efficiency to be raised to as much as approximately 70%. Operation simulation using data obtained in verification tests showed that the convenience for most users could be increased by installing a storage tank together with the SHS2.

Reference

(1) Okabe, M., Nakazawa, K., Taruya, K., Handa, K.: Verification Test of Solar-powered Hydrogen Station (SHS) with Photovoltaic Modules, Honda R&D Technical Review, Vol. 20, No. 1, p. 72-79
(2) Nakazawa, K., Nagaoka, H., Takeuchi, J., Moburg, F., Yamashita, I., Okabe, M.: Introduction of High Differential Pressure Water Electrolysis-type Solar Hydrogen Station (SHS2), Honda R&D Technical Review, Vol. 22, No. 2, p. 28-35
(3) Okabe, M., Nakazawa, K.: Effort to Develop Honda Solar Hydrogen Station (SHS), Journal of the Hydrogen Energy Systems Society of Japan, Vol. 35, No. 3, p. 22-28 (2010)
(4) Okabe, M.: Development of Solar Hydrogen Station (SHS2) with “High differential pressure Electrolyzer”, Journal of Fuel Cell Technology, Vol. 11, No. 2, p. 30-36 (2011)
(5) http://www.honda.co.jp/soltec/cigs/index.html, 2012/5/23
(6) Haryu, E., Nakazawa, K., Taruya, K., Ishikawa, H., Okabe, M.: Mechanical Structure and Performance Evaluation of High Differential Pressure Water Electrolysis Cell, Honda R&D Technical Review, Vol. 23, No. 2, p. 97-105
(7) SAE J2719:2011. Hydrogen Fuel Quality for Fuel Cell Vehicles
(8) ISO/TS 14687-2:2008. Hydrogen fuel – Product Specification – Part 2: Proton exchange membrane (PEM) fuel cell applications for road vehicles

Author (organization or company)

Hisashi NAGAOKA(Automobile R&D Center)、Nobuyoshi YOSHIDA(Automobile R&D Center)、David CUN(HONDA R&D AMERICAS, INC.)、Ikuya YAMASHITA(Automobile R&D Center)、Masanori OKABE(Automobile R&D Center)

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