Article (Scientific journals)
Thermo-Economic optimization of waste heat recovery Organic Rankine Cycles
Quoilin, Sylvain; Declaye, Sébastien; Tchanche, Bertrand F. et al.
2011In Applied Thermal Engineering
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Keywords :
thermoeconomics; optimization; organic rankine cycle; waste heat recovery
Abstract :
[en] The present paper focuses both on the thermodynamic and on the economic optimization of a small scale ORC in waste heat recovery application. A sizing model of the ORC is proposed, capable of predicting the cycle performance with different working fluids and different components sizes. The working fluids considered are R245fa, R123, n-butane, n-pentane and R1234yf and Solkatherm. Results indicate that, for the same fluid, the objective functions (economics profitability, thermodynamic efficiency) lead to different optimal working conditions in terms of evaporating temperature: the operating point for maximum power doesn’t correspond to that of the minimum specific investment cost: The economical optimum is obtained for n-butane with a specific cost of 2136 €/kW, a net output power of 4.2 kW, and an overall efficiency of 4.47%, while the thermodynamic optimum is obtained for the same fluid with an overall efficiency of 5.22%. It is also noted that the two optimizations can even lead to the selection of a different working fluid. This is mainly due to additional fluid properties that are not taken into account in the thermodynamic optimization, such as the fluid density: a lower density leads to the selection of bigger components which increases the cost and decreases the economical profitability.
Disciplines :
Energy
Author, co-author :
Quoilin, Sylvain  ;  Université de Liège - ULiège > Département d'aérospatiale et mécanique > Systèmes énergétiques
Declaye, Sébastien ;  Université de Liège - ULiège > Département d'aérospatiale et mécanique > Systèmes énergétiques
Tchanche, Bertrand F.;  Agricultural University of Athens
Lemort, Vincent  ;  Université de Liège - ULiège > Département d'aérospatiale et mécanique > Systèmes énergétiques
Language :
English
Title :
Thermo-Economic optimization of waste heat recovery Organic Rankine Cycles
Publication date :
2011
Journal title :
Applied Thermal Engineering
ISSN :
1359-4311
eISSN :
1873-5606
Publisher :
Pergamon Press - An Imprint of Elsevier Science, Oxford, United Kingdom
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
since 07 May 2011

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