Biofuel-related price transmission literature: A review

Serra, Teresa; Zilberman, David

doi:10.1016/j.eneco.2013.02.014

Cited by 220 publications

(135 citation statements)

References 88 publications

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confidence: 99%

Effects of direct injection timing of ethanol fuel on engine knock and lean burn in a port injection gasoline engine

Zhuang

Hong

2014

Fuel

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Improving engine efficiency and reducing its emissions are the major tasks of recent development in internal combustion technology [1]. This is driven by the society concerns about the global warming and the depletion in supply of fossil fuels. One of the feasible short-to-midterm solutions for addressing the concerns is to use renewable fuels such as ethanol. Many countries and areas have enacted legislations [2] or incentive policies to promote the use of ethanol and other bio/renewable fuels [3,4]. The use of ethanol and other bio/renewable fuels has brought new challenges to automotive sector to develop new technologies. Ethanol direct injection plus gasoline port injection (EDI + GPI) is one of the new technologies in recent development.Previous studies on SI engines found that using ethanol fuel could help to reduce unburned emissions such as carbon monoxide (CO) and hydrocarbon (HC) [5][6][7], enhance engine anti-knock ability [8,9], and improve lean burn performance [10,11]. In the current applications, ethanol is externally blended with gasoline at a specific ratio. The applications of this method decreased pollutant emissions and increased engine efficiency in certain engine conditions [12,13]. However, the vehicles may face problems of reduced vehicle coverage, difficult cold start [14], corrosion and reduced lubrication [15]. Moreover, due to the fixed ethanol/gasoline ratio, the ethanol's potential in reducing engine emissions and improving thermal efficiency cannot be fully exploited. Research has already shown that the optimal ethanol/gasoline ratio for maximizing engine efficiency and minimizing emissions was varied with the engine operation condition [6,7]. EDI + GPI dual-fuel injection, on the other hand, provides an opportunity to solve the problems and meet the requirements. It offers greater flexibility of using ethanol fuel because the ethanol and gasoline mixing ratio can be instantly altered according to the engine operation Effects of direct injection timing of ethanol fuel on engine knock and lean burn in a port injection gasoline engine AbstractEthanol is a promising alternative fuel for internal combustion engines due to its renewable feature. To make the use of ethanol fuel more effective and efficient, ethanol direct injection plus gasoline port injection (EDI + GPI) has been investigated in recent years. By directly injecting ethanol into the engine, the advantages of ethanol fuel such as high latent heat of vaporization, fast laminar flame speed, wide flammability and better low temperature combustion stability can be well utilized to enhance engine anti-knock ability and improve lean burn performance. For an engine equipped with direct injection (DI) system, start of injection (SOI) timing is an important control parameter which directly affects the engine performance. This paper reports the investigation to the effect of ethanol fuel SOI timing on knock mitigation and lean burn. Experiments were conducted on a 250 cc single cylinder spark ignition (SI) engine equipped with EDI ...

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Effects of direct injection timing of ethanol fuel on engine knock and lean burn in a port injection gasoline engine

Zhuang

Hong

2014

Fuel

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“…The Westernization of diets in Asian economies (Pingali 2007), along with rapid income growth, are also highlighted as important drivers (Enders and Holt 2012). Another driver is the diversion of food crops into the production of biofuels, which is generally considered to influence long-run agricultural price levels (Serra and Zilberman 2013). The recent price booms have also lead to increased interest in the Prebisch-Singer hypothesis of continuous long-term declines in primary commodity prices (Balagtas and Holt 2009;Harvey and Kellard 2010;Enders and Holt 2012).…”

Section: Fig 1 Fao Food Price Indices 1990-2013mentioning

confidence: 99%

Disentangling supply and demand shifts: the impacts on world salmon price

Brækkan

2014

Applied Economics

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To understand price changes one must determine the relative impact of supply and demand shifts on price. Conditional on pre-determined supply and demand elasticities, we retrieve yearly shifts in regional supply and demand. The relative impact on price from each supply and demand shift is determined through an Equilibrium Displacement Model (EDM). This procedure is applied on a yearly basis for the world salmon market in the period from 2002 to 2011. The results indicate a large variation in demand and supply growth both over time and between regions. While average annual price impacts from supply or demand shifts from most regions were not statistically significant, price impacts from supply or demand shifts for specific periods are detected in all but one region. This indicates the use of smooth trend indicators is likely to be inappropriate for measuring supply and demand shifts and their impacts on price.The procedure presented in this paper can be a useful instrument for determining the relative impacts of supply and demand shifts on price in any market with unstable price behaviour.

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“…This early price transmission literature is reviewed by Serra and Zilberman (2013) and . More recent comprehensive literature reviews of the food versus fuels debate are provided by de Gorter et al (2015) and by Hochman and Zilberman (2016).…”

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confidence: 99%

Food Versus Fuel: An Updated and Expanded Evidence

et al. 2017

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Standard-Nutzungsbedingungen:Die Dokumente auf EconStor dürfen zu eigenen wissenschaftlichen Zwecken und zum Privatgebrauch gespeichert und kopiert werden.Sie dürfen die Dokumente nicht für öffentliche oder kommerzielle Zwecke vervielfältigen, öffentlich ausstellen, öffentlich zugänglich machen, vertreiben oder anderweitig nutzen.Sofern die Verfasser die Dokumente unter Open-Content-Lizenzen (insbesondere CC-Lizenzen) zur Verfügung gestellt haben sollten, gelten abweichend von diesen Nutzungsbedingungen die in der dort genannten Lizenz gewährten Nutzungsrechte. What do prices tell us?" Energy Policy 38, pp. 445-451. We confirm the findings of the original paper that there was only a weak relationship between ethanol and food commodities in the period between March 1989 and July 2008. In addition, we extend that study and examine the cointegration relationship between biofuels and related commodities for a considerably enlarged dataset (3 vs. 1 market, 26 vs. 8 commodities, analysis up till 2017 vs. 2008, weekly vs. monthly data frequency). Focusing on the biofuel markets of Brazil, the EU and the USA in the three separate periods before, during, and after the food crisis of 2007 and 2008, we show that studying the time variation of the relationships plays an essential role in their proper understanding. Our results help to clarify the wide extensive discussion about the role of biofuels prices in food shortages manifested particularly during the food crises. In agreement with the original study, we confirm that price series data do not support strong statements about biofuels uniformly serving as main leading source of high food prices and consequently the food shortages. Terms of use: Documents in

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Biofuel-related price transmission literature: A review

Cited by 220 publications

References 88 publications

Effects of direct injection timing of ethanol fuel on engine knock and lean burn in a port injection gasoline engine

Effects of direct injection timing of ethanol fuel on engine knock and lean burn in a port injection gasoline engine

Disentangling supply and demand shifts: the impacts on world salmon price

Food Versus Fuel: An Updated and Expanded Evidence

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