Combined Cycle for Hybrid Vehicles

Chammas, Rody El; Clodic, Denis

doi:10.4271/2005-01-1171

Cited by 92 publications

(85 citation statements)

References 11 publications

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“…The heat transfer coefficient outside the evaporator pipe can be also obtained by Equation (4). Considering the phase change in the tube, different correlations are used for the convective heat transfer coefficient inside tube.…”

Section: Bρ E2mentioning

confidence: 99%

“…In practice, under the different working conditions of ICEs, the exhaust gas temperature of light-duty engines varies from 500 to 900˝C and that of heavy-duty engines is in the range of 400 to 650˝C [2,3]. The investigation conducted by Chammas and Clodic [4] has shown that the available exhaust gas energy varies greatly depending on engine conditions for a typical light duty engine. A similar conclusion was obtained by Ringler [5] and Teng [6] based on a medium duty engine and typical truck diesel engine, respectively.…”

Section: Introductionmentioning

confidence: 99%

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Part-Load Performance Prediction and Operation Strategy Design of Organic Rankine Cycles with a Medium Cycle Used for Recovering Waste Heat from Gaseous Fuel Engines

2016

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Abstract:The Organic Rankine Cycle (ORC) is regarded as a suitable way to recover waste heat from gaseous fuel internal combustion engines. As waste heat recovery systems (WHRS) have always been designed based on rated working conditions, while engines often work under part-load conditions, it is quite significant to analyze the part-load performance and corresponding operation strategy of ORC systems. This paper presents a dynamic model of ORC with a medium cycle used for a large gaseous fuel engine and analyzes the effect of adjustable parameters on the system performance, giving effective control directions under various conditions. The results indicate that the intermediary fluid mass flow rate has nearly no effect on the output power and thermal efficiency of the ORC, while the mass flow rate of working fluid has a great effect on them. In order to get a better system performance under different working conditions, the system should be operated with the working fluid mass flow rate as large as possible, but with a slight degree of superheating. Then, with the control of constant superheat degree at the end of the heating process, the performance of the combined system that consists of ORC and the engine at steady state under seven typical working conditions is also analyzed. The results indicate that the energy-saving effect of WHRS becomes worse and worse as the working condition decreases. Especially at 40% working condition the WHRS nearly has no energy-saving effect anymore.

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Section: Bρ E2mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Part-Load Performance Prediction and Operation Strategy Design of Organic Rankine Cycles with a Medium Cycle Used for Recovering Waste Heat from Gaseous Fuel Engines

2016

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“…For instance, a Spark Ignition with 1.4 L ICE and thermal efficiency of 15-32%, wastes 1.7-45 kW of energy through radiator coolant and 4.6-120 kW of through exhaust gas [5]. During the past decades, many researchers have conducted different configurations of Rankine Cycles by using different working fluids to improve the systems' performance [6][7][8][9][10][11][12][13][14][15].…”

Section: Introductionmentioning

confidence: 99%

Energy Analysis and Multi-Objective Optimization of an Internal Combustion Engine-Based CHP System for Heat Recovery

Ganjehkaviri

Jaafar

2014

Entropy

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Abstract:A comprehensive thermodynamic study is conducted of a diesel based Combined Heat and Power (CHP) system, based on a diesel engine and an Organic Rankine Cycle (ORC). Present research covers both energy and exergy analyses along with a multiobjective optimization. In order to determine the irreversibilities in each component of the CHP system and assess the system performance, a complete parametric study is performed to investigate the effects of major design parameters and operating conditions on the system's performance. The main contribution of the current research study is to conduct both exergy and multi-objective optimization of a system using different working fluid for lowgrade heat recovery. In order to conduct the evolutionary based optimization, two objective functions are considered in the optimization; namely the system exergy efficiency, and the total cost rate of the system, which is a combination of the cost associated with environmental impact and the purchase cost of each component. Therefore, in the optimization approach, the overall cycle exergy efficiency is maximized satisfying several constraints while the total cost rate of the system is minimized. To provide a better understanding of the system under study, the Pareto frontier is shown for multi-objective optimization and also an equation is derived to fit the optimized point. In addition, a closed form relationship between exergy efficiency and total cost rate is derived.

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“…To overcome this trend, new vehicle technologies must be introduced to achieve better fuel economy consumption without increasing harmful gaseous emissions. For internal combustion engine (ICE) in most typical gasoline fuelled vehicles, for a typical 2.0 L gasoline engine used in passenger cars, it was estimated that 21% of the fuel energy is wasted through the exhaust at the most common load and speed range [1]. The rest of the fuel energy is lost in the form of waste heat in the coolant, as well as friction and parasitic losses.…”

Section: Introductionmentioning

confidence: 99%

Study on waste heat recovery from exhaust gas spark ignition (S.I.) engine using steam turbine mechanism

et al. 2016

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Abstract. The issue of global warming has pushed the effort of researchers not only to find alternative renewable energy, but also to improve the machine's energy efficiency. This includes the utilization of waste energy into 'useful energy'. For a vehicle using internal combustion engine (ICE), the waste energy produce by exhaust gas can be utilize to 'useful energy' up to 34%. The energy from the automotive exhaust can be harness by implementing heat pipe heat exchanger in the automotive system. In order to maximize the amount of waste energy that can be turned to 'useful energy', the used of appropriate fluid in the heat exchanger is important. In this study, the fluid used is water, thus converting the fluid into steam and thus drive the turbine that coupling with generator. The paper will explore the performance of a naturally aspirated spark ignition (S.I.) engine equipped with waste heat recovery mechanism (WHRM) that used water as the heat absorption medium. The experimental and simulation test suggest that the concept is thermodynamically feasible and could significantly enhance the system performance depending on the load applied to the engine.

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Combined Cycle for Hybrid Vehicles

Cited by 92 publications

References 11 publications

Part-Load Performance Prediction and Operation Strategy Design of Organic Rankine Cycles with a Medium Cycle Used for Recovering Waste Heat from Gaseous Fuel Engines

Part-Load Performance Prediction and Operation Strategy Design of Organic Rankine Cycles with a Medium Cycle Used for Recovering Waste Heat from Gaseous Fuel Engines

Energy Analysis and Multi-Objective Optimization of an Internal Combustion Engine-Based CHP System for Heat Recovery

Study on waste heat recovery from exhaust gas spark ignition (S.I.) engine using steam turbine mechanism

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