Accession Number : AD0282283

Title :   EQUIVALENT CIRCUITS AND EFFICIENCIES OF FUEL CELLS,

Corporate Author : DEPUTY COMMANDER AEROSPACE SYSTEMS INGLEWOOD CALIF

Personal Author(s) : Scherrer ,V. E. ; Theus ,R. B. ; Faust,W. R.

Report Date : JUN 1953

Pagination or Media Count : 7

Abstract : A thermodynamic equivalent circuit which yields the correct current-potential curve for low current is determined for a fuel cell. A linear electrical equivalent circuit is constructed which represents closely the electrical performance of the cell over a wide range of current (not approaching zero). Polarization processes are taken into account through a single constant parameter. Introduction of the equivalent thermal potential into the circuit yields a thermodynamic equivalent circuit whose output coincides exactly with that given by the electrical equivalent circuit. The correct electrical properties, thermodynamic power balance, and thermodynamic efficiency follow directly from the circuit. A general theorem is formulated, independently of the validity of an equivalent circuit, connecting the thermodynamic and electrical efficiencies of a fuel cell. Confirmatory experimental results based on hydrogen-oxygen cells are presented. The experimental results underline the large reduction in available power brought about by polarization processes in a fuel cell, in addition to that produced by the entropy change in the chemical reaction. (Author)

Descriptors :   *CIRCUITS, *FUEL CELLS, CHEMICAL REACTIONS, ELECTRICAL PROPERTIES, ENTROPY, HEAT OF REACTION, HYDROGEN, OXYGEN, POLARIZATION, THEORY, THERMODYNAMICS

Distribution Statement : APPROVED FOR PUBLIC RELEASE