Integrated evaluation of Inverted Brayton cycle recovery unit bottomed to a turbocharged diesel engine

Battista, Davide Di; Carapellucci, Roberto; Cipollone, Roberto

doi:10.1016/j.applthermaleng.2020.115353

Cited by 20 publications

(13 citation statements)

References 43 publications

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“…Kennedy et al report about 5% decrease in brake specific fuel consumption. Di Battista et al demonstrated 3.5% of the brake mechanical power recovery [14], and 3.4% net efficiency increase in a later work [13] underlining the operability of the system only under the engine load above 70%.…”

Section: Studied Systemmentioning

confidence: 92%

“…But only recently this concept got a new wave of attention in the scientific literature. In particular, the application of IBC for the reciprocating engine bottoming is studied by Kennedy et al [12] and Di Battista et al [13] for light vehicles, or Di Battista et al [14] for heavy vehicles whose models show good results from thermodynamic point of view. Kennedy et al report about 5% decrease in brake specific fuel consumption.…”

Section: Studied Systemmentioning

confidence: 99%

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Techno-economic analysis of waste heat recovery by inverted Brayton cycle applied to an LNG-fuelled transport truck

et al. 2021

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Aiming for the better environmental and economic performance of traditional engines, waste heat recovery (WHR) technologies are actively studied to find their most beneficial applications. In this work, the inverted Brayton cycle (IBC) is investigated as a potential WHR solution for liquefied natural gas (LNG) fuelled transport truck. LNG being one of the less polluting fossil fuels is widely spreading nowadays in different industries due to the rapid development of the LNG supply chain in the world. LNG-fuelled cargo transportation follows this prevailing trend. Based on the overexpansion of flue gases to subatmospheric pressure, inverted Brayton cycle, in turn, is considered a prospective technology of WHR and techno-economic analysis of IBC in several configurations on-board of a heavy transport truck have been assessed. IBC is integrated into the engine cooling system in the basic layout, and additionally, it incorporates LNG regasification process in advanced configurations. Power balance based on Aspen Hysys model enables to perform system optimisation and gives preliminary design parameters of the system components. Cost function approach provides the basis for a preliminary economic assessment of the layouts. Although the system shows fuel economy of maximum about 2.1 %, analysis revealed the necessity to continue the search for better technical solutions in IBC-based systems to make them economically attractive due to high cost of installed equipment.

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Section: Studied Systemmentioning

confidence: 92%

Section: Studied Systemmentioning

confidence: 99%

Techno-economic analysis of waste heat recovery by inverted Brayton cycle applied to an LNG-fuelled transport truck

et al. 2021

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“…There are many types of thermodynamic cycles which can be coupled to engines as the waste heat recovery system [25][26][27][28][29], and the most well-known one is the organic Rankine cycle (ORC) [21,27]. This cycle contains four components in which the organic working fluid circulates in a cycle [22].…”

Section: Introductionmentioning

confidence: 99%

“…Air Brayton cycle (ABC) is another cycle also recommended for WHR in the literature [24,28,29] which may have some advantages over ORC for vehicle engine applications as it is less complex. The lower number of ABC components when compared to ORC means that ABC will add less mass to vehicle than ABC in implementations.…”

Section: Introductionmentioning

confidence: 99%

Energy and exergy analysis of a novel turbo-compounding system for supercharging and mild hybridization of a gasoline engine

Salek

Babaie

Ghodsi

et al. 2020

J Therm Anal Calorim

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Number of hybrid vehicles has increased around the world significantly. Automotive industry is utilizing the hybridization of the powertrain system to achieve better fuel economic and emissions reduction. One of the options recently considered in research for hybridization and downsizing of vehicles is to employ waste heat recovery systems. In this paper, the addition of a turbo-compound system with an air Brayton cycle (ABC) to a naturally aspirated engine was studied in AVL BOOST software. In addition, a supercharger was modeled to charge extra air into the engine and ABC. The engine was first validated against the experimental data prior to turbo-compounding. The energy and exergy analysis was performed to understand the effects of the proposed design at engine rated speed. Results showed that between 16 and 18% increase in engine mechanical power can be achieved by adding turbo-compressor. Furthermore, the recommended ABC system can recover up to 1.1 kW extra electrical power from the engine exhaust energy. The energy and exergy efficiencies were both improved slightly by turbo-compounding and BSFC reduced by nearly 1% with the proposed system. Furthermore, installing the proposed system resulted in increase in backpressure up to approximately 23.8 kPa.

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“…The most studied application is the exhaust heat conversion into mechanical or electrical power through a thermodynamic cycle, usually ORC one [14,15], but more than one limiting aspects should be overcome [16,17]. Direct heat recovery seems a technology more easily to be implemented, with similar benefits [18,19]. Also the coolant energy can be exploited for low grade thermal recovery [20,21] and this integration can have additional benefits also in electrified powertrains and hybrid vehicles [22,23].…”

Section: Introductionmentioning

confidence: 99%

Experimental and numerical analyses to improve the design of engine coolant pumps

et al. 2020

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In this paper, an experimentally based procedure is presented to re-orient the design point of the pump in order to minimize the energy absorbed during the homologation cycle or during any real driving one. During it, in fact, every benefit on the pump’s efficiency is appreciated and produces fuel consumption and CO2 reduction. The procedure takes the advantage from a dynamic test bench for coolant pump, realized and engineered at University of L’Aquila. It has been linked to a model-based methodology, which evaluates, according to a specified vehicle’s mission profile, the speed and load variation of the engine propelling the vehicle, and, therefore, the pump speed. The knowledge of the engine cooling circuit for closed and fully opened thermostat allows the calculation of the flow rates and pressure delivered in each time instant of the drive cycle. The speed-flow rate-pressure delivered pump profile has been reproduced on the bench, and all the relevant quantities have been measured: an exact evaluation of the scatter of the efficiency of the pump, the instantaneous power and the overall energy absorbed have been obtained. Results show how the pump efficiency is far from its Best Efficiency Point. This conclusion invited the Authors to reorient the design pump considering an operating condition, which has a greater occurrence among all the operating points characteristic of a drive cycle. Four pumps have been designed following this approach, showing a sensible reduction of the energy absorbed: this represents a key point also for pump electrification.

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Integrated evaluation of Inverted Brayton cycle recovery unit bottomed to a turbocharged diesel engine

Cited by 20 publications

References 43 publications

Techno-economic analysis of waste heat recovery by inverted Brayton cycle applied to an LNG-fuelled transport truck

Techno-economic analysis of waste heat recovery by inverted Brayton cycle applied to an LNG-fuelled transport truck

Energy and exergy analysis of a novel turbo-compounding system for supercharging and mild hybridization of a gasoline engine

Experimental and numerical analyses to improve the design of engine coolant pumps

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