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This study compares the performance of Organic Rankine Cycle (ORC) and Kalina Cycle System 11 (KCS11) in recovering waste heat from a 13000 PEM Fuel Cell stack, showing ORC has higher energy and exergy efficiencies than KCS11.

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What they did

System
MFC

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Abstract

Abstract In this study, the performance analysis of waste heat recovery systems in a power generation system consisting of 13000 Proton Exchange Membrane Fuel Cells (PEMFC) in a stack has been investigated. Organic Rankine Cycle (ORC) and Kalina Cycle System 11 (KCS11) as bottoming cycles to convert generated waste heat of stack into electricity were compared with each other in a defined hybrid system. The improvement of system with an exact energy and exergy analysis after utilizing the waste heat in the hybrid system has been analyzed. Results show that the energy efficiency of combined system using Organic Rankine Cycle and Kalina Cycle System 11 increase by about 5% and 1.75% respectively. In addition, exergy analysis results indicate that exergy efficiency of combined system using Organic Rankine Cycle and Kalina Cycle System 11 increases by about 4% and 1.5% respectively. The total exergy destruction rate obtained for the hybrid power systems is 235.5 kW when ORC is used and 329.7 kW when KCS11 is used respectively. Results show that in presented systems ORC has higher energy and exergy efficiencies than KCS11 but different used working fluids and equipment of systems must also be considered from an economical point of view.

Key findings

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Keywords

Organic Rankine cycleExergyExergy efficiencyWaste heatWaste heat recovery unitRankine cycle

Identifiers

DOI
10.2478/bipie-2022-0008
Journal
Bulletin of the Polytechnic Institute of Iași. Electrical Engineering, Power Engineering, Electronics Section
Year
2022