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Economic Optimization of Small Scale Organic Rankine Cycles
Tchanche, Bertrand; Quoilin, Sylvain; Declaye, Sébastien et al.
2010
Peer reviewed
 

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Keywords :
Economic Optimization; Waste Heat Recovery; Organic Rankine Cycle
Abstract :
[en] The present paper focuses on the economic optimization of a small scale ORC in waste heat recovery application with specific investment cost as objective function. First, a pre-design model of the ORC was built and simulations run with different working fluids to evaluate their technical performance. In a second step, components and system cost models were built and simulations carried out to evaluate the cost effectiveness of systems associated with different fluids. The working fluids considered are R245fa, R123, R113, n-Pentane and n-Butane. Results indicate that for the same fluid, the point of high performance and that f cost-effectiveness do not match. The operating point for maximum power doesn’t correspond to that of the minimum specific investment cost. For n-Pentane, the maximum net power of 1.98 kW is obtained for an evaporator pressure of 5.14 bar and the specific investment cost is 5450 €/kW. For this same fluid, a minimum specific investment cost of 4440 €/kW is obtained for an evaporator pressure of 8.5 bar and the corresponding power output is 1.745 kW. The mismatch aforementioned is due to the thermodynamic properties such as liquid/vapour densities, which significantly influence system performance and components sizes. Seeking for profitable environmental solutions, economic optimization as a necessary step in the optimization of any thermodynamic system is highly advised.
Disciplines :
Energy
Author, co-author :
Tchanche, Bertrand
Quoilin, Sylvain  ;  Université de Liège - ULiège > Département d'aérospatiale et mécanique > Systèmes énergétiques
Declaye, Sébastien ;  Université de Liège - ULiège > Département d'aérospatiale et mécanique > Turbomachines et propulsion aérospatiale
Papadakis, George
Lemort, Vincent  ;  Université de Liège - ULiège > Département d'aérospatiale et mécanique > Systèmes énergétiques
Language :
English
Title :
Economic Optimization of Small Scale Organic Rankine Cycles
Publication date :
June 2010
Event name :
23rd International Conference on Efficiency, Cost, Optimization, Simulation and Environmental Impact of Energy Systems
Event organizer :
ECOS
Event place :
Lausanne, Switzerland
Event date :
June 2010
Audience :
International
Peer reviewed :
Peer reviewed
Available on ORBi :
since 29 June 2010

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