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Victor Rangel, César Torres, Alejandro Zaleta, and Manuel Gomez (2019)

Computing the exergy costs of electricity, refrigeration and waste heat of a hybrid system based on a solid oxide fuel cells and an absortion refrigeration system

Energies, 12(18):3476.

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.

exergy cost, SOFC, absorption system

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