Design and assessment on a novel integrated system for power and refrigeration using waste heat from diesel engine

Lu, Yiji; Wang, Yaodong; Dong, Chenxuan; Wang, Liwei; Roskilly, Anthony Paul

doi:10.1016/j.applthermaleng.2015.08.057

Cited by 39 publications

(21 citation statements)

References 37 publications

(47 reference statements)

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“…Three performance metrics are used for the ORC-WHR systems: cycle thermal efficiency (η I, c ), heat recovery efficiency (ε hr ), and overall energy conversion efficiency η I, overall [34]. Cycle thermal efficiency is calculated by means of Equation (6), while heat recovery efficiency is calculated using Equation (7), and overall energy conversion efficiency is calculated as shown in Equation (8).…”

Section: Exergy Analysismentioning

confidence: 99%

“…However, these results are limited to an exergetic analysis of a single ORC configuration. Lu et al [8] proposed an integrated diesel internal combustion engine and simple ORD (SORC) with solids adsorption technology for waste heat recovery from the cooling system and the engine exhaust gases. Their results showed a maximum recoverable power from the cooling process and exhaust systems of 67.9 kW and 82.7 kW, respectively.Vaja and Gambarotta [9] evaluated the performance of SORC and ORC with a recuperator (RORC) configurations for WHR in a stationary 2.9-MW ICE at a single operation point.…”

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confidence: 99%

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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: Exergy Analysismentioning

confidence: 99%

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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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“…From the results obtained in their research, it is possible to design the working conditions for a cogeneration system, where the maximum recoverable power from the cooling process and exhaust systems are 67,9 kW and 82.7,kW respectively. While assembling to a cogeneration system can provide an output power of 13,9 kW and cooling power of 16,6 kW in nominal engine conditions [8], these results reveal the feasibility of recovery processes from waste gases by reducing specific fuel consumption, without including exergetic or thermo-economic studies.…”

Section: Introductionmentioning

confidence: 91%

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

Valencia¹,

Fontalvo²,

Cardenas³

et al. 2019

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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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“…The main results of their research were a thermal efficiency of 85.7% and a reduction of CO, NOx, and PM by 73.3%, 34.3%, and 94%, respectively. Lu et al [17] studied a novel combined power and refrigeration system using Organic Rankine cycle (ORC) and a sorption system. They proposed and assessed the coolant energy and exhaust energy from a medium-duty diesel engine under various operating conditions for energy recovery.…”

Section: Introductionmentioning

confidence: 99%

Experimental Evaluation of a Diesel Cogeneration System for Producing Power and Drying Aromatic Herbs

et al. 2019

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The focus of this work was to evaluate the thermal performance of a cogeneration system used to produce power and dry aromatic herbs. The waste heat from the exhaust gases of the diesel engine was recovered to heat air using a thermosyphon heat exchanger. The heated air was employed in a convective tray dryer in order to dry Origanum vulgare, Mentha spicata, and Ocimum basilicum. The experiments were carried out at full load in a stationary compression ignition engine coupled to a generator. The maximum global energy efficiency of the cogeneration system was 40.14%, and the effectiveness of the heat exchanger achieved 39%.

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Design and assessment on a novel integrated system for power and refrigeration using waste heat from diesel engine

Cited by 39 publications

References 37 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

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

Experimental Evaluation of a Diesel Cogeneration System for Producing Power and Drying Aromatic Herbs

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