Review of organic Rankine cycle (ORC) architectures for waste heat recovery

Lecompte, Steven; Huisseune, Henk; Broek, Martijn van den; Vanslambrouck, Bruno; Paepe, Michel De

doi:10.1016/j.rser.2015.03.089

Cited by 563 publications

(193 citation statements)

References 81 publications

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“…The increment in efficiency provided by recuperation is consistent with the literature [37,38]. Higher efficiency means that a high power output can be maintained for a decreased heat input to the ORC [38]. In this work, the heat input was not necessarily decreased from NORC to RORC, which lead to higher values for both efficiency and net power output under RORC configuration.…”

Section: Deep Seawater Cooled Systemsupporting

confidence: 87%

“…This is expected as cycles operating with dry fluids (and isentropic to a lesser extent) have a characteristic high energy available at the expander outlet [35,36]. The increment in efficiency provided by recuperation is consistent with the literature [37,38]. Higher efficiency means that a high power output can be maintained for a decreased heat input to the ORC [38].…”

Section: Deep Seawater Cooled Systemsupporting

confidence: 72%

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Deep Water Cooled ORC for Offshore Floating Oil Platform Applications

Val¹,

Silva²,

Oliveira³

2017

International Journal of Thermodynamics

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Due to global warming, environmental pollution and cost reduction, increasing efficiency of electricity conversion has become a key issue for the offshore market. This paper proposes an Organic Rankine Cycle (ORC), which uses heat waste from exhaust gases of an FPSO (Floating, Production, Storage and Offloading unit) as heating source, and deep ocean water as cooling source. A genetic algorithm optimization was conducted targeting maximization of net power output, by taking in to consideration of 23 working fluids. Expander inlet temperature and pressure were set as independent variables. The analysis encompasses subcritical or supercritical conditions and recuperation was included in a second version of the system as an option. The first configuration presented ethanol as optimal fluid, followed by toluene and the second configuration indicated cyclohexane followed by ethanol. Use of recuperation, when feasible, increased power output specially for cycles operating with dry and isentropic fluids, presenting an average contribution of 22.7%. Net power and efficiency results from ORC using deep sea water in condenser were presented and compared with ORC using shallow ocean water as cooling source and with Carnot efficiency operating under the same temperatures. Use of deep water raised net power output by 23.3% (cyclohexane recuperative ORC) and 12.5% (ethanol non-recuperative ORC) for the optimal configurations.

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Section: Deep Seawater Cooled Systemsupporting

confidence: 87%

Section: Deep Seawater Cooled Systemsupporting

confidence: 72%

Deep Water Cooled ORC for Offshore Floating Oil Platform Applications

Val¹,

Silva²,

Oliveira³

2017

International Journal of Thermodynamics

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“…Organic Rankine cycle power system technology ORC power systems have been used to generate electricity from waste heat for several decades [23]. Apart from the standard sub-critical ORC architecture, other configurations have been investigated, such as wet expansion [21,[24][25] and trans-critical cycles [26] (Fig. 1).…”

Section: Introductionmentioning

confidence: 99%

Technical and economic optimization of subcritical, wet expansion and transcritical Organic Rankine Cycle (ORC) systems coupled with a biogas power plant

Dumont

Dickes

Роса

et al. 2018

Energy Conversion and Management

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A B S T R A C TGenerally, > 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, transcritical 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.

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“…This technology has reported an improvement as much as 11% in brake specific fuel consumption (BSFC) in a heavy duty direct injection engine [4]. ORC is widely used in large engine because of its complex architecture [5]. This results in a heavy system and occupies a bigger space in overall system integration which is not suitable for small vehicles.…”

Section: Introductionmentioning

confidence: 99%

Exergy Analysis of Organic Rankine Cycle and Electric Turbo Compounding for Waste Heat Recovery

Muhammad

Mamat

Salim

2018

IJET

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With such tough legislation on current emission standards, car manufacturers are focusing on increasing the efficiency of their engines with the development of advance waste heat recover (WHR) technology. Organic Rankine Cycle (ORC) and Electric Turbo Compounding (ETC) system have a good potential to be used as exhaust energy recovery. This paper compares the exergy availability and losses between the ORC and the ETC. In this particular study, exhaust data from the Proton 1.6L CamPro CFE turbocharged engine was used. This particular engine already has a main turbocharger, making the added WHR as a secondary recovery system to further increase the engine efficiency. Both systems are coupled to a 1 kW electric generator for ease of comparisons. At first the available exer gy is calculated for both WHR technologies. Exergy losses from rotating the generator are analysed to finally determine the thermal effi ciency of the overall system. Exergy calculation is simplified to only account for chemical and physical exergy since kinetic and potential energy are negligible in comparison. Available exergy for ORC was significantly high which went up to 12.5 kW with the exergy losses recorded at 9.7 kW. The ETC achieved only 5 kW but had a small loss at 8x10-3 kW. Average thermal efficiency of the ORC systems was 10.7% compared to ETC which was 58.7%. It can be concluded that the complexity of the ORC system contributes to its downfall where multiple components increase its exergy losses compared to the simplistic design of an ETC.

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Review of organic Rankine cycle (ORC) architectures for waste heat recovery

Cited by 563 publications

References 81 publications

Deep Water Cooled ORC for Offshore Floating Oil Platform Applications

Deep Water Cooled ORC for Offshore Floating Oil Platform Applications

Technical and economic optimization of subcritical, wet expansion and transcritical Organic Rankine Cycle (ORC) systems coupled with a biogas power plant

Exergy Analysis of Organic Rankine Cycle and Electric Turbo Compounding for Waste Heat Recovery

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