Reference : Technical and economic optimization of subcritical, wet expansion and transcritical O...
Scientific journals : Article
Engineering, computing & technology : Energy
http://hdl.handle.net/2268/219813
Technical and economic optimization of subcritical, wet expansion and transcritical Organic Rankine Cycle (ORC) systems coupled with a biogas power plant
English
Dumont, Olivier mailto [Université de Liège - ULiège > Département d'aérospatiale et mécanique > Systèmes énergétiques >]
Dickes, Rémi mailto [Université de Liège - ULiège > Département d'aérospatiale et mécanique > Systèmes énergétiques >]
De Rosa, M. [School of Mechanical & Materials Engineering, University College Dublin, Belfield, Dublin, Ireland]
Douglas, R. [School of Mechanical & Aerospace Engineering, Queen's University Belfast, Ashby Building, Stranmillis Road, Belfast, United Kingdom]
Lemort, Vincent mailto [Université de Liège - ULiège > Département d'aérospatiale et mécanique > Systèmes énergétiques >]
2018
Energy Conversion and Management
Elsevier Ltd
157
294-306
Yes (verified by ORBi)
0196-8904
1879-2227
[en] Biogas power plant ; Organic Rankine cycle ; Subcritical ; Thermo-economic optimization ; Trans-critical ; Waste heat recovery ; Wet expansion ; Biogas ; Commerce ; Earnings ; Energy conservation ; Exhaust gases ; Gases ; Genetic algorithms ; Heat pump systems ; Ignition ; Plant expansion ; Starting ; Waste heat ; Waste heat utilization ; Organic Rankine cycles ; Thermoeconomic optimization ; Rankine cycle
[en] Generally, >40% of the useful energy (cooling engine and exhaust gases) are wasted by a biogas power plant through the cooling radiator and the exhaust gases. An efficient way to convert this waste heat into work and eventually electricity is the use of an organic Rankine cycle (ORC) power system. Over the last few years, different architectures have been widely investigated (subcritical, wet expansion and trans-critical). Despite the promising performances, realistic economic and technical constraints, also related to the application, are required for a meaningful comparison between ORC technologies and architectures. Starting from the limited literature available, the aim of the present paper is to provide a methodology to compare sub-critical, trans-critical and wet expansion cycles and different types of expanders (both volumetric and turbomachinery) from both technical and economic point of view, which represent one of the main novel aspects of the present work. In particular, the paper focuses on the thermo-economic optimization of an ORC waste heat recovery unit for a 500 kWe biogas power plant located in a detailed regional market, which was not investigated yet. By means of a genetic algorithm, the adopted methodology optimizes a given economic criteria (Pay-Back Period, Net Present Value, Profitability Index and Internal Rate of Return) while respecting technical constraints (expander limitations) and thermodynamic constraints (positive pinch points in heat exchangers, etc.). The results show that optimal ORC solutions with a potential of energy savings up to 600 MWh a year and with a pay-back period lower than 3 years are achievable in the regional market analysed. © 2017 Elsevier Ltd
http://hdl.handle.net/2268/219813
10.1016/j.enconman.2017.12.022

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