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TECHNICAL PAPERS

Investigation of a Solar-Thermal Bio-mimetic Metal Hydride Actuator

[+] Author and Article Information
George M. Lloyd

Department of Civil and Materials Engineering, University of Illinois at Chicago, 842 West Taylor Street, Chicago, IL 60607e-mail: lloydg@asme.org

Kwang J. Kim

Department of Mechanical Engineering, University of Nevada at Reno, Reno, NV 89557e-mail: kwangkim@unr.edu

A. Razani

Department of Mechanical Engineering, University of New Mexico, Albuquerque, NM 87106

Mohsen Shahinpoor

AMRI, School of Engineering/School of Medicine, University of New Mexico, Albuquerque, NM 87122

J. Sol. Energy Eng 125(1), 95-100 (Jan 27, 2003) (6 pages) doi:10.1115/1.1531147 History: Received March 01, 2002; Revised August 01, 2002; Online January 27, 2003
Copyright © 2003 by ASME
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Figures

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Left: Diagram of the basic elements of a solar-thermal metal hydride actuator, (center, right): Prototype actuator (based on LaNi5) being tested
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Equilibrium data and model for the metal hydride LaNi4.3Al0.7
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Van’t Hoff plots for two hydrides suitable for a variety of solar-thermal applications: ΔHLaNi4.3Al0.7=−3.47×107(J/kmoleH2) and ΔSLaNi4.3Al0.7=−1.088×105 (J/kmoleH2⋅K);ΔHMmNi4.15Fe0.85=−2.68×107 (J/kmoleH2) and ΔSMmNi4.15Fe0.85=−1.085×105 (J/kmoleH2⋅K).
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PMH (powder-metal hydride) compacts prior to reactor assembly. Heat and mass transport within these compacts is characterized by the transport parameters K(5×10−15 (m2)),keff(5(W/m⋅K)), and ϕ=0.15.
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Absorption profile of an ideally selective surface.
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Cylindrical reactor with an ideally selective surface undergoing desorption by solar irradiation. (The paper assumes a uniformly irradiated surface for simplicity, and for consistency with the 1-D heat and mass transport formulation.)
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Main figure: Temperature histories in the LaNi4.7Al0.3 reactor, and corrected H2 flow rate, for a solar concentration β=50. (The periodic perturbations are due to zone-by-zone depletion of absorbed hydrogen as the dual desorption fronts progress.) Inset: absorbed hydrogen concentration profiles at 10-s intervals, showing the evolution toward a core ring.
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Corrected flow rate for the three values of β investigated
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Top: time to peak power; Bottom: standard flow rate

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