The Exergy Costs of Electrical Power, Cooling, and Waste Heat from a Hybrid System Based on a Solid Oxide Fuel Cell and an Absorption Refrigeration System

V. H. Rangel-Hernandez, C. Torres, A. Zaleta-Aguilar and M. A. Gomez-Martinez
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V. H. Rangel-Hernandez: Institute of Energy and Climate Research, Forschungszentrum Jülich GmbH, 52441 Jülich, Germany
C. Torres: CIRCE Institute, Universidad de Zaragoza, 50018 Zaragoza, Spain
A. Zaleta-Aguilar: Department of Mechanical Engineering, University of Guanajuato, Salamanca 36800, Mexico
M. A. Gomez-Martinez: Department of Electrical Engineering, University of Guanajuato, Salamanca 36800, Mexico

Energies, 2019, vol. 12, issue 18, 1-15

Abstract: This paper applies the Exergy Cost Theory (ECT) to a hybrid system based on a 500 kWe solid oxide fuel cell (SOFC) stack and on a vapor-absorption refrigeration (VAR) system. To achieve this, a model comprised of chemical, electrochemical, thermodynamic, and thermoeconomic equations is developed using the software, Engineering Equation Solver (EES). The model is validated against previous works. This approach enables the unit exergy costs (electricity, cooling, and residues) to be computed by a productive structure defined by components, resources, products, and residues. Most importantly, it allows us to know the contribution of the environment and of the residues to the unit exergy cost of the product of the components. Finally, the simulation of different scenarios makes it possible to analyze the impact of stack current density, fuel use, temperature across the stack, and anode gas recirculation on the unit exergy costs of electrical power, cooling, and residues.

Keywords: exergy cost; SOFC; absorption system; irreversibility (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2019
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (3)

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