Potential for Improving HD Diesel Truck Engine Fuel Consumption Using Exhaust Heat Recovery Techniques

Hountalas, D. T.; Mavropoulos, G. C.

doi:10.5772/10428

Cited by 13 publications

(7 citation statements)

References 26 publications

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“…Compared to turbo-compounding, ORC exhibits higher brake specific fuel consumption (BSFC) reduction potential [83]. The main disadvantage of turbo-compounding is the interaction with the engine.…”

Section: Comparison Between Orc System and Other Technologies (Thermomentioning

confidence: 99%

Expander Technologies for Automotive Engine Organic Rankine Cycle Applications

Alshammari

Karvountzis-Kontakiotis

Pesyridis

et al. 2018

Energies

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The strive towards ever increasing automotive engine efficiencies for both diesel and gasoline engines has in recent years been forced by ever-stringent emissions regulations, as well as the introduction of fuel consumption regulations. The untapped availability of waste heat in the internal combustion engine (ICE) exhaust and coolant systems has become a very attractive focus of research attention by industry and academia alike. Even state of the art diesel engines operating at their optimum lose approximately 50% of their fuel energy in the form of heat. As a result, waste heat recovery (WHR) systems have gained popularity as they can deliver a reduction in fuel consumption and associated CO2 emissions. Of these, the Organic Rankine Cycle (ORC) is a well matured waste heat recovery technology that can be applied in vehicle powertrains, mainly due to the low additional exhaust backpressure on the engine and the potential opportunity to utilize various engine waste heat sources. ORCs have attracted high interest again recently but without commercial exploitation as of today due to the significant on-cost they represent to the engine and vehicle. In ORCs, expansion machines are the interface where useable power production takes place; therefore, selection of the expander technology is directly related to the thermal efficiency of the system. Moreover, the cost of the expander-generator units accounts for the largest proportion of the total cost. Therefore, selection of the most appropriate expander is of great importance at the early stage of any automotive powertrain project. This study aims to review the relevant research studies for expansion machines in ORC-ICE applications, analyzing the effects of specific speed on expander selection, exploring the operational characteristics of each expander to further assist in the selection of the most appropriate expander, and comparing the costs of various expanders based on publically available data and correlations.

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Section: Comparison Between Orc System and Other Technologies (Thermomentioning

confidence: 99%

Expander Technologies for Automotive Engine Organic Rankine Cycle Applications

Alshammari

Karvountzis-Kontakiotis

Pesyridis

et al. 2018

Energies

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“…study and develop this technology. According to the study, the Rankine cycle utilization system can provide a reduction of the specific fuel consumption by 11% [30].…”

Section: Rankine Cyclementioning

confidence: 99%

Heat Recovery Systems for Agricultural Vehicles: Utilization Ways and Their Efficiency

2018

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The focus of today’s agriculture is to reduce fuel consumption and pollutant emission. More than 50% of the fuel energy is lost with the exhaust gas and coolant of diesel engines. Therefore, waste heat recovery systems are a promising concept to meet economical and ecological requirements. Agricultural vehicles have an operating cycle that is quite different from on-road trucks (higher engine load factor and less annual utilization). This has influence on the efficiency of waste heat recovery. The purpose of this paper was to analyze different waste heat recovery technologies to be used in agricultural applications. In the study, technical and economic indicators have been used. According to suggested classification, four pathways for utilization were studied. Turbocompounding, electric turbocompounding, and heating of transmission oil for hydraulic clutch gearboxes have proved to be effective for agricultural vehicles. For the economical conditions of the European Union (EU), a turbocompounding diesel engine is acceptable if agricultural tractor rated power is more than 275 kW, and combine harvester rated power is more than 310 kW. In cold climates, heat recovery transmission warm-up may be recommended. Waste heat absorption refrigerators have proven to be a viable technology for air conditioning and intake air cooling systems.

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“…where h = 0.7 was chosen corresponding to the efficiency of the recovery turbine. This method was used by Hountalas et al 20 The global efficiency is the global power divided by the fuel power. The BSFC (g/kW h) of the turbocompund engine is then…”

Section: Definition Of a Global Efficiencymentioning

confidence: 99%

A methodology for evaluating the turbocompound potential for an automotive engine

Ismail

Chessé

Chalet

et al. 2015

Proceedings of the Institution of Mechanical Engineers, Part D:

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This paper deals with the exhaust energy recovery in internal-combustion engines; it aims to describe existing evaluation methodologies of exhaust energy recovery and to compare their results with a suggested methodology which is developed in this work. The novelty of the suggested methodology is that it shows all the different potentials of energy recovery. It covers both theory and real applications with a comparison of both of these. At the beginning of the paper, the methodologies described in the literature are introduced. Next, different potentials of exhaust energy recovery are calculated. Then, a complete methodology is developed to evaluate the potential of the exhaust energy recovery by turbocompounding. This methodology is described and applied to a 2 l diesel engine through numerical simulations. Finally, conclusions are drawn on the basis of the results.

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Potential for Improving HD Diesel Truck Engine Fuel Consumption Using Exhaust Heat Recovery Techniques

Cited by 13 publications

References 26 publications

Expander Technologies for Automotive Engine Organic Rankine Cycle Applications

Expander Technologies for Automotive Engine Organic Rankine Cycle Applications

Heat Recovery Systems for Agricultural Vehicles: Utilization Ways and Their Efficiency

A methodology for evaluating the turbocompound potential for an automotive engine

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