Article (Scientific journals)
Systematic optimization of subcritical and transcritical organic Rankine cycles (ORCs) constrained by technical parameters in multiple applications
Maraver, Daniel; Royo, Javier; Lemort, Vincent et al.
2014In Applied Energy, 117, p. 11-29
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Keywords :
ORC (organic Rankine cycle); Optimization; Waste heat recovery; CHP (combined heating and power); Geothermal; Solar thermal
Abstract :
[en] The present work is focused on the thermodynamic optimization of organic Rankine cycles (ORCs) for power generation and CHP from different average heat source profiles (waste heat recovery, thermal oil for cogeneration and geothermal). The general goal is to provide optimization guidelines for a wide range of operating conditions, for subcritical and transcritical, regenerative and non-regenerative cycles. A parameter assessment of the main equipment in the cycle (expander, heat exchangers and feed pump) was also carried out. An optimization model of the ORC (available as an electronic annex) is proposed to predict the best cycle performance (subcritical or transcritical), in terms of its exergy efficiency, with different working fluids. The working fluids considered are those most commonly used in commercial ORC units (R134a, R245fa, Solkatherm, n-Pentane, Octamethyltrisiloxane and Toluene). The optimal working fluid and operating conditions from a purely thermodynamic approach are limited by the technological constraints of the expander, the heat exchangers and the feed pump. Hence, a complementary assessment of both approaches is more adequate to obtain some preliminary design guidelines for ORC units.
Disciplines :
Energy
Author, co-author :
Maraver, Daniel;  CIRCE – Research Centre for Energy Resources and Consumption
Royo, Javier;  CIRCE – Research Centre for Energy Resources and Consumption
Lemort, Vincent  ;  Université de Liège - ULiège > Département d'aérospatiale et mécanique > Systèmes énergétiques
Quoilin, Sylvain  ;  Université de Liège - ULiège > Département d'aérospatiale et mécanique > Systèmes énergétiques
Language :
English
Title :
Systematic optimization of subcritical and transcritical organic Rankine cycles (ORCs) constrained by technical parameters in multiple applications
Publication date :
15 March 2014
Journal title :
Applied Energy
ISSN :
0306-2619
eISSN :
1872-9118
Publisher :
Elsevier Science
Volume :
117
Pages :
11-29
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
since 23 December 2013

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