Recovery of thermomechanical exergy from cryofuels

Fyke, A.; Li, D.; Crane, P.; Scott, David

doi:10.1016/s0360-3199(96)00104-8

Cited by 11 publications

(5 citation statements)

References 8 publications

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“…In the energy field, liquefied natural gas (LNG) has become popular for large scale storage of natural gas and its transportation from the production sites to countries and cities thousands miles away [17]. It is anticipated that similar operations would occur for liquid hydrogen if the hydrogen economy become a reality [18]. Over the past decade or so, liquid nitrogen/air as a combustion free and non-polluting 'fuel' has attracted lots of attention [21].…”

Section: Fundamental Aspects Of Cryogen As An Energy Carriermentioning

confidence: 99%

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Fundamentals and applications of cryogen as a thermal energy carrier: A critical assessment

Chen

Ding

2010

International Journal of Thermal Sciences

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Section: Fundamental Aspects Of Cryogen As An Energy Carriermentioning

confidence: 99%

“…Cryogenic energy recovery has been investigated theoretically using the second law of thermodynamics [18,20,26]. Four main methods have been proposed to extract the cold exergy from cryogen for power generation.…”

Section: Extraction Of Energy From Cryogenmentioning

confidence: 99%

Fundamentals and applications of cryogen as a thermal energy carrier: A critical assessment

Chen

Ding

2010

International Journal of Thermal Sciences

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“…Considering LN 2 has a thermomechanical exergy of ;770 kJ kg -1 , this equates to 4% efficiency. Fyke et al 21 proposed a similar principle for liquid hydrogen (LH 2 ) vehicles, where separate Stirling engines would operate between the LH 2 and engine coolant. An attractive alternative cold-utilisation method is to use the LNG to cool the engine intake air to potentially sub-ambient temperatures.…”

Section: Introductionmentioning

confidence: 99%

The fundamental effects of in-cylinder evaporation of liquefied natural gas fuels in engines

Finneran

Garner

Nadal

2020

Proceedings of the Institution of Mechanical Engineers, Part D:

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Liquefied natural gas is emerging as viable and potentially sustainable transportation fuel with intrinsic economic and environmental benefits. Liquefied natural gas possesses thermomechanical exergy amounting to ∼1 MJ kg-1 which is currently wasted on liquefied natural gas vehicles, while it could be used to produce useful work. The present investigation proposes an indirect means of obtaining useful work from liquefied natural gas through charge cooling and also demonstrates additional benefits in terms of NOx emissions and power density. A thermodynamic engine model was used to quantify the performance benefits of such a strategy for a homogeneous-charge, spark-ignited, stoichiometric natural gas engine. Four fuelling strategies were compared in terms of fuel consumption, mean effective pressure and NOx emissions. Compared to the conventional port-injected natural gas engine (where gaseous fuel is injected), it was found that directly injecting the liquid phase fuel into the cylinder near the start of the compression stroke resulted in approximately -8.9% brake specific fuel consumption, +18.5% brake mean effective pressure and -51% brake specific NOx depending on the operating point. Port-injection of the fuel in the liquid phase carried similar benefits, while direct injection of the fuel in the gaseous phase resulted in minor efficiency penalties (∼+1.3% brake specific fuel consumption). This work highlights the future potential of liquefied natural gas vehicles to achieve high specific power, high efficiency and ultra-low emissions (such as NOx) by tailoring the fuel system to fully exploit the cryogenic properties of the fuel.

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“…Tomando en consideración la temperatura del foco caliente, si ésta es igual o inferior a la temperatura ambiente, da lugar a los procesos CERS "Cryogenic Exergy Recovery Systems" mientras que si es superior da lugar a los procesos ECERS "Enhanced Cryogenic Exergy Recovery Systems" [84], [162]. Estos últimos a su vez pueden ser Calor residual de otro proceso…”

Section: Figura 1: Clasificación De Los Procesos Térmicosunclassified

“…Como se puede apreciar, únicamente se podrá aprovechar entre un 37% y un 41% de la exergía física del GNL, considerando como estado final el correspondiente a las condiciones de inyección del gas natural en la red básica de transporte en España. Los valores obtenidos están en línea con los que aparecen en la bibliografía, estando estos comprendidos un 40% y un 50% [1], [37], [84], [124], [235].…”

Section: Conclusiones (Capítulo 3)unclassified

Aprovechamiento de la exergía física del GNL

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Recovery of thermomechanical exergy from cryofuels

Cited by 11 publications

References 8 publications

Fundamentals and applications of cryogen as a thermal energy carrier: A critical assessment

Fundamentals and applications of cryogen as a thermal energy carrier: A critical assessment

The fundamental effects of in-cylinder evaporation of liquefied natural gas fuels in engines

Aprovechamiento de la exergía física del GNL

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