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Open AccessEditor’s ChoiceArticle

Multiobjective Optimization of a Plate Heat Exchanger in a Waste Heat Recovery Organic Rankine Cycle System for Natural Gas Engines

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Programa de Ingeniería Mecánica, Grupo de Investigación en Gestión Eficiente de la Energía KAI, Universidad del Atlántico, Carrera 30 Número 8-49, Puerto Colombia, Área Metropolitana de Barranquilla 080007, Colombia
2
Departamento de Energia, Grupo de Investigación en Optimización Energética GIOPEN, Universidad de la Costa CUC, Cl. 58 # 55-66, Barranquilla, Atlántico 080002, Colombia
*
Author to whom correspondence should be addressed.
Entropy 2019, 21(7), 655; https://doi.org/10.3390/e21070655
Received: 27 May 2019 / Revised: 24 June 2019 / Accepted: 1 July 2019 / Published: 3 July 2019
(This article belongs to the Special Issue Thermodynamic Optimization)
A multiobjective optimization of an organic Rankine cycle (ORC) evaporator, operating with toluene as the working fluid, is presented in this paper for waste heat recovery (WHR) from the exhaust gases of a 2 MW Jenbacher JMS 612 GS-N.L. gas internal combustion engine. Indirect evaporation between the exhaust gas and the organic fluid in the parallel plate heat exchanger (ITC2) implied irreversible heat transfer and high investment costs, which were considered as objective functions to be minimized. Energy and exergy balances were applied to the system components, in addition to the phenomenological equations in the ITC2, to calculate global energy indicators, such as the thermal efficiency of the configuration, the heat recovery efficiency, the overall energy conversion efficiency, the absolute increase of engine thermal efficiency, and the reduction of the break-specific fuel consumption of the system, of the system integrated with the gas engine. The results allowed calculation of the plate spacing, plate height, plate width, and chevron angle that minimized the investment cost and entropy generation of the equipment, reaching 22.04 m2 in the heat transfer area, 693.87 kW in the energy transfer by heat recovery from the exhaust gas, and 41.6% in the overall thermal efficiency of the ORC as a bottoming cycle for the engine. This type of result contributes to the inclusion of this technology in the industrial sector as a consequence of the improvement in thermal efficiency and economic viability. View Full-Text
Keywords: acquisition cost; entropy generation number; heat exchanger; multiobjective optimization; ORC; waste heat recovery acquisition cost; entropy generation number; heat exchanger; multiobjective optimization; ORC; waste heat recovery
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MDPI and ACS Style

Valencia, G.; Núñez, J.; Duarte, J. Multiobjective Optimization of a Plate Heat Exchanger in a Waste Heat Recovery Organic Rankine Cycle System for Natural Gas Engines. Entropy 2019, 21, 655. https://doi.org/10.3390/e21070655

AMA Style

Valencia G, Núñez J, Duarte J. Multiobjective Optimization of a Plate Heat Exchanger in a Waste Heat Recovery Organic Rankine Cycle System for Natural Gas Engines. Entropy. 2019; 21(7):655. https://doi.org/10.3390/e21070655

Chicago/Turabian Style

Valencia, Guillermo; Núñez, José; Duarte, Jorge. 2019. "Multiobjective Optimization of a Plate Heat Exchanger in a Waste Heat Recovery Organic Rankine Cycle System for Natural Gas Engines" Entropy 21, no. 7: 655. https://doi.org/10.3390/e21070655

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