Thermodynamic simulations of rankine, trilateral and supercritical cycles for hot water and exhaust gas heat recovery

Trilateral cycle is one of the heat cycles for waste heat recovery system. In the heat exchange process of the trilateral cycle, pressurized working fluid is kept as a single liquid phase. Therefore, temperature-profile matching between the heat source and the working fluid should be improved, and...

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Autores principales:	Hiroshi KANNO, Naoki SHIKAZONO
Formato:	article
Lenguaje:	EN
Publicado:	The Japan Society of Mechanical Engineers 2014
Materias:	waste heat recovery trilateral cycle process optimization exergy analysis sensitivity analysis volumetric expander Mechanical engineering and machinery TJ1-1570
Acceso en línea:	https://doaj.org/article/74783b3fee5644c29edce5b8ddfdeaf1
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spelling	oai:doaj.org-article:74783b3fee5644c29edce5b8ddfdeaf12021-11-26T06:12:42ZThermodynamic simulations of rankine, trilateral and supercritical cycles for hot water and exhaust gas heat recovery2187-974510.1299/mej.2014tep0046https://doaj.org/article/74783b3fee5644c29edce5b8ddfdeaf12014-10-01T00:00:00Zhttps://www.jstage.jst.go.jp/article/mej/1/5/1_2014tep0046/_pdf/-char/enhttps://doaj.org/toc/2187-9745Trilateral cycle is one of the heat cycles for waste heat recovery system. In the heat exchange process of the trilateral cycle, pressurized working fluid is kept as a single liquid phase. Therefore, temperature-profile matching between the heat source and the working fluid should be improved, and exergy loss can be minimized. In the present study, thermodynamic performances of Rankine, trilateral and supercritical cycles are assessed. In the cycle simulation, maximum pressures of these three cycles are optimized to give the highest exergy efficiency. Cycle performance criteria are sink-temperature-based exergy efficiency, isentropic expansion ratio and maximum pressure. Exhaust gas (400℃) and hot water (80℃) are assumed for the heat sources. Simulation results show that the sink-temperature-based exergy efficiency of trilateral cycle is 78 %, which is 1.36 times larger than that of Rankine cycle for the hot water case. For the exhaust gas case, water is the optimal working fluid for the trilateral cycle, and the sink-temperature-based exergy efficiency is 80 %. Especially in the trilateral cycle, the optimum expansion ratio shows large variation depending on the working fluids and working conditions. Thus, a reciprocating expander should be suitable from the view point of adaptability to various working conditions. In the present study, the effect of volumetric expansion ratio with reciprocating expander is also investigated. Simulation results show that the volumetric expansion ratio of 100 or even higher is needed to reduce the expander loss.Hiroshi KANNONaoki SHIKAZONOThe Japan Society of Mechanical Engineersarticlewaste heat recoverytrilateral cycleprocess optimizationexergy analysissensitivity analysisvolumetric expanderMechanical engineering and machineryTJ1-1570ENMechanical Engineering Journal, Vol 1, Iss 5, Pp TEP0046-TEP0046 (2014)
institution	DOAJ
collection	DOAJ
language	EN
topic	waste heat recovery trilateral cycle process optimization exergy analysis sensitivity analysis volumetric expander Mechanical engineering and machinery TJ1-1570
spellingShingle	waste heat recovery trilateral cycle process optimization exergy analysis sensitivity analysis volumetric expander Mechanical engineering and machinery TJ1-1570 Hiroshi KANNO Naoki SHIKAZONO Thermodynamic simulations of rankine, trilateral and supercritical cycles for hot water and exhaust gas heat recovery
description	Trilateral cycle is one of the heat cycles for waste heat recovery system. In the heat exchange process of the trilateral cycle, pressurized working fluid is kept as a single liquid phase. Therefore, temperature-profile matching between the heat source and the working fluid should be improved, and exergy loss can be minimized. In the present study, thermodynamic performances of Rankine, trilateral and supercritical cycles are assessed. In the cycle simulation, maximum pressures of these three cycles are optimized to give the highest exergy efficiency. Cycle performance criteria are sink-temperature-based exergy efficiency, isentropic expansion ratio and maximum pressure. Exhaust gas (400℃) and hot water (80℃) are assumed for the heat sources. Simulation results show that the sink-temperature-based exergy efficiency of trilateral cycle is 78 %, which is 1.36 times larger than that of Rankine cycle for the hot water case. For the exhaust gas case, water is the optimal working fluid for the trilateral cycle, and the sink-temperature-based exergy efficiency is 80 %. Especially in the trilateral cycle, the optimum expansion ratio shows large variation depending on the working fluids and working conditions. Thus, a reciprocating expander should be suitable from the view point of adaptability to various working conditions. In the present study, the effect of volumetric expansion ratio with reciprocating expander is also investigated. Simulation results show that the volumetric expansion ratio of 100 or even higher is needed to reduce the expander loss.
format	article
author	Hiroshi KANNO Naoki SHIKAZONO
author_facet	Hiroshi KANNO Naoki SHIKAZONO
author_sort	Hiroshi KANNO
title	Thermodynamic simulations of rankine, trilateral and supercritical cycles for hot water and exhaust gas heat recovery
title_short	Thermodynamic simulations of rankine, trilateral and supercritical cycles for hot water and exhaust gas heat recovery
title_full	Thermodynamic simulations of rankine, trilateral and supercritical cycles for hot water and exhaust gas heat recovery
title_fullStr	Thermodynamic simulations of rankine, trilateral and supercritical cycles for hot water and exhaust gas heat recovery
title_full_unstemmed	Thermodynamic simulations of rankine, trilateral and supercritical cycles for hot water and exhaust gas heat recovery
title_sort	thermodynamic simulations of rankine, trilateral and supercritical cycles for hot water and exhaust gas heat recovery
publisher	The Japan Society of Mechanical Engineers
publishDate	2014
url	https://doaj.org/article/74783b3fee5644c29edce5b8ddfdeaf1
work_keys_str_mv	AT hiroshikanno thermodynamicsimulationsofrankinetrilateralandsupercriticalcyclesforhotwaterandexhaustgasheatrecovery AT naokishikazono thermodynamicsimulationsofrankinetrilateralandsupercriticalcyclesforhotwaterandexhaustgasheatrecovery
_version_	1718409784019910656

Thermodynamic simulations of rankine, trilateral and supercritical cycles for hot water and exhaust gas heat recovery

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