고온 고분자연료전지 기반 삼중열병합 시스템의 이론적 해석
Analysis of a High Temperature Polymer Electrolyte Fuel Cell based Trigeneration System
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Model equations for a combined system with a high temperature polymer electrolyte fuel cell (HT-PEFC) system and anabsorption heat pump (AHP) system were derived analytically. An AHP is proposed as a bottoming cycle system to utilize efficientlythe waste heat from a fuel cell stack for cooling and heating purposes. The four-heat-reservoir model with a work conversionconstraint was used to calculate the equivalent power output of the AHP. To calculate the AHP performance analytically, a modifiedirreversible Carnot cycle coupled to heating and cooling fluids with a finite heat capacity rate was considered. By combining the AHPsystem with the HT-PEFC system, the equivalent electric power was improved by 26% to 33% according to the load conditions. TheCOP values ranged from 1.0 and 1.2 for cooling purposes and from 2.0 to 2.2 for heating purposes. By combining with the AHP, theannual heat utilization rate can be improved compared to a single fuel cell system. The methods proposed in this paper can provide auseful measurement of the performance available in a practical fuel cell-based hybrid power system without complex numericalcalculations.
Abstract
Model equations for a combined system with a high temperature polymer electrolyte fuel cell (HT-PEFC) system and anabsorption heat pump (AHP) system were derived analytically. An AHP is proposed as a bottoming cycle system to utilize efficientlythe waste heat from a fuel cell stack for cooling and heating purposes. The four-heat-reservoir model with a work conversionconstraint was used to calculate the equivalent power output of the AHP. To calculate the AHP performance analytically, a modifiedirreversible Carnot cycle coupled to heating and cooling fluids with a finite heat capacity rate was considered. By combining the AHPsystem with the HT-PEFC system, the equivalent electric power was improved by 26% to 33% according to the load conditions. TheCOP values ranged from 1.0 and 1.2 for cooling purposes and from 2.0 to 2.2 for heating purposes. By combining with the AHP, theannual heat utilization rate can be improved compared to a single fuel cell system. The methods proposed in this paper can provide auseful measurement of the performance available in a practical fuel cell-based hybrid power system without complex numericalcalculations.
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