Experimental study of a small scale organic Rankine cycle waste heat recovery system for a heavy duty diesel engine with focus on the radial inflow turbine expander performance

Alshammari, Fuhaid; Pesyridis, Apostolos; Karvountzis-Kontakiotis, Apostolos; Franchetti, Ben; Pesmazoglou, Yagos

doi:10.1016/j.apenergy.2018.01.049

Cited by 72 publications

(27 citation statements)

References 42 publications

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“…ORC is considered as a feasible tool to increase overall conversion efficiency in industrial processes due to its capacity to recover energy from alternative sources, such as exhaust gases, cooling water, or lubricating oil, by using organic working fluids [2]. Furthermore, ORC configuration can be modified to maximize overall engine-ORC system performance by optimizing net power output, first law, working fluids such as toluene, cyclohexane, and acetone.…”

Section: Introductionmentioning

confidence: 99%

Energy and Exergy Analysis of Different Exhaust Waste Heat Recovery Systems for Natural Gas Engine Based on ORC

et al. 2019

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Waste heat recovery (WHR) from exhaust gases in natural gas engines improves the overall conversion efficiency. The organic Rankine cycle (ORC) has emerged as a promising technology to convert medium and low-grade waste heat into mechanical power and electricity. This paper presents the energy and exergy analyses of three ORC-WHR configurations that use a coupling thermal oil circuit. A simple ORC (SORC), an ORC with a recuperator (RORC), and an ORC with double-pressure (DORC) configuration are considered; cyclohexane, toluene, and acetone are simulated as ORC working fluids. Energy and exergy thermodynamic balances are employed to evaluate each configuration performance, while the available exhaust thermal energy variation under different engine loads is determined through an experimentally validated mathematical model. In addition, the effect of evaporating pressure on the net power output, thermal efficiency increase, specific fuel consumption, overall energy conversion efficiency, and exergy destruction is also investigated. The comparative analysis of natural gas engine performance indicators integrated with ORC configurations present evidence that RORC with toluene improves the operational performance by achieving a net power output of 146.25 kW, an overall conversion efficiency of 11.58%, an ORC thermal efficiency of 28.4%, and a specific fuel consumption reduction of 7.67% at a 1482 rpm engine speed, a 120.2 L/min natural gas flow, 1.784 lambda, and 1758.77 kW of mechanical engine power.Energies 2019, 12, 2378 2 of 22 and exergy efficiencies and minimizing exergy destruction [3]. Nevertheless, ORC-engine coupling must be carefully designed to avoid safety, performance, and revenue issues such as gas-fluid contact, as well as weight, complexity, and backpressure increase [4].ORC-WHR research has addressed the integration between ORC and combustion engines. Plenty of studies have established that ORC improves the overall conversion efficiency by increasing net power production without penalizing fuel consumption. Patel and Doyle [5] presented a first attempt for WHR from diesel engines by using ORC. Their ORC system achieved an overall power increase of 13% in a Mack 676 diesel vehicle engine without increasing fuel consumption. Peris et al. [6] simulated six ORC configurations for WHR from cooling water in internal combustion engines (ICE) by using 10 non-flammable fluids. Their study showed that ICE electric efficiency could be increased by 4.9-5.3%, by achieving overall conversion efficiencies up to 7.15% at a relatively low-temperature cooling water (90 • C). Yu et al.[7] simulated a diesel engine-ORC integration for WHR from the engine exhaust gases and cooling system by using R245fa as the ORC working fluid. Their results showed that 75% of exhaust gases energy and 9.5% of cooling water energy could be recovered if ORC operating conditions are optimized and controlled to maintain the power output. However, these results are limited to an exergetic analysis of a single ORC configuration. Lu et al. [8] ...

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Section: Introductionmentioning

confidence: 99%

Energy and Exergy Analysis of Different Exhaust Waste Heat Recovery Systems for Natural Gas Engine Based on ORC

et al. 2019

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“…Recently, organic Rankine cycles (ORC) have been intensively applied [3]. Alshammari et al [4,5] tested the ORC system as a bottoming cycle in heavy-duty diesel engines. The results were promising with 3% reduction in engine exhaust gases and 6 kW generated power.…”

Section: Introductionmentioning

confidence: 99%

Electric Boosting and Energy Recovery Systems for Engine Downsizing

Alshammari

Pesyridis

2019

Energies

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Due to the increasing demand for better fuel economy and increasingly stringent emissions regulations, engine manufacturers have paid attention towards engine downsizing as the most suitable technology to meet these requirements. This study sheds light on the technology currently available or under development that enables engine downsizing in passenger cars. Pros and cons, and any recently published literature of these systems, will be considered. The study clearly shows that no certain boosting method is superior. Selection of the best boosting method depends largely on the application and complexity of the system.

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“…Results evidence an improvement in operational performance for heat recovery through RORC with Toluene at an evaporation pressure of 3.4 MPa, achieving 146.25 kW of net power output, 11.58% of overall conversion efficiency, 28.4% of ORC thermal efficiency, and an specific fuel consumption reduction of 7.67% at a 1482 rpm engine speed, a 120.2 L/min natural gas Flow, 1.784 lambda, and 1758.77 kW mechanical engine power. Keywords: Energy analysis; exergy analysis; organic Rankine cycle; waste heat recovery; natural gas engine.ORCs are now considered as a feasible tool to increase the energy efficiency due to the heat recovery capacity of alternative sources, such as exhaust gases, cooling water or lubricating oil, and the use of organic and environmentally friendly working fluids [2]. Furthermore, ORCs allow their configuration to vary at different levels of complexity considering the temperature of the heat source, in order to achieve the highest possible thermodynamic performance [3].During the installation of an ORC in the exhaust line of an engine, several safety hazards must be considered due to the possible contact of the exhaust gases with the organic working fluid.Preprints (www.preprints.org) | NOT PEER-REVIEWED |…”

mentioning

confidence: 99%

“…ORCs are now considered as a feasible tool to increase the energy efficiency due to the heat recovery capacity of alternative sources, such as exhaust gases, cooling water or lubricating oil, and the use of organic and environmentally friendly working fluids [2]. Furthermore, ORCs allow their configuration to vary at different levels of complexity considering the temperature of the heat source, in order to achieve the highest possible thermodynamic performance [3].…”

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confidence: 99%

Energy and Exergy Analysis of Different Exhaust Waste Heat Recovery Systems for Natural Gas Engine Based on ORC

Valencia¹,

Fontalvo²,

Cardenas³

et al. 2019

Preprint

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One way to increase overall natural gas engine efficiency is to transform exhaust waste heat into useful energy by means of a bottoming cycle. Organic Rankine cycle (ORC) is a promising technology to convert medium and low grade waste heat into mechanical power and electricity. This paper presents an energy and exergy analysis of three ORC-Waste heat recovery configurations by using an intermediate thermal oil circuit: Simple ORC (SORC), ORC with Recuperator (RORC) and ORC with Double Pressure (DORC), and Cyclohexane, Toluene and Acetone have been proposed as working fluids. An energy and exergy thermodynamic model is proposed to evaluate each configuration performance, while available exhaust thermal energy variation under different engine loads was determined through an experimentally validated mathematical model. Additionally, the effect of evaportating pressure on net power output , absolute thermal efficiency increase, absolute specific fuel consumption decrease, overall energy conversion efficiency, and component exergy destruction is also investigated. Results evidence an improvement in operational performance for heat recovery through RORC with Toluene at an evaporation pressure of 3.4 MPa, achieving 146.25 kW of net power output, 11.58% of overall conversion efficiency, 28.4% of ORC thermal efficiency, and an specific fuel consumption reduction of 7.67% at a 1482 rpm engine speed, a 120.2 L/min natural gas Flow, 1.784 lambda, and 1758.77 kW mechanical engine power.

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Experimental study of a small scale organic Rankine cycle waste heat recovery system for a heavy duty diesel engine with focus on the radial inflow turbine expander performance

Cited by 72 publications

References 42 publications

Energy and Exergy Analysis of Different Exhaust Waste Heat Recovery Systems for Natural Gas Engine Based on ORC

Energy and Exergy Analysis of Different Exhaust Waste Heat Recovery Systems for Natural Gas Engine Based on ORC

Electric Boosting and Energy Recovery Systems for Engine Downsizing

Energy and Exergy Analysis of Different Exhaust Waste Heat Recovery Systems for Natural Gas Engine Based on ORC

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