Heats of combustion of fatty esters and triglycerides

Freedman, B.; Bagby, M. O.

doi:10.1007/bf02636185

Cited by 94 publications

(38 citation statements)

References 9 publications

(13 reference statements)

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“…Increasing unsaturation for a given chain length for both esters (methyl and ethyl) and triglycerides resulted in a decrease in the heat of combustion due to the loss of hydrogen. 68 The heat of combustion increases with increasing chain length and decreases with increasing unsaturation, 7,69,70 whereas fatty alcohols possess 55 Knothe et al 64 …”

Section: Heat Of Combustionmentioning

confidence: 98%

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Effects of the properties and the structural configurations of fatty acid methyl esters on the properties of biodiesel fuel: a review

Gopinath

Krishnamurthy

Velraj

et al. 2014

Proceedings of the Institution of Mechanical Engineers, Part D:

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Biodiesel is a renewable fuel that is suitable for both stationary and automotive engines. It consists of fatty acid methyl esters and fatty acid ethyl esters when vegetable oils are transesterified with methanol and ethanol respectively. The structural configuration and properties of individual fatty acid methyl esters can significantly influence the biodiesel properties. The purpose of the present work is to review the effects of the properties and the structural configurations of fatty acid methyl esters on various biodiesel properties. The structural configuration includes the molecular structure, the chain length, the saturated or unsaturated nature, the degree of unsaturation and the position of double bonds. Important properties of fatty acid methyl esters are reviewed, and a large number of data consisting of their reported values are given. The viscosity, the cetane number, the heat of combustion, the density, the bulk modulus and compressibility, the iodine value, the oxidative stability, the low-temperature properties, the boiling point, the lubricity, the saponification value, the surface tension, the specific heat, the latent heat of vaporization and the flash point are reviewed in the present study. The reported mathematical equations for estimating the properties of fatty acid compounds and biodiesel are presented. A few studies that recommend enrichment of a particular fatty acid (or acids) which is possible through genetic modification to improve the overall biodiesel properties are also cited. The contribution of a particular fatty acid (or acids) favours some properties while it has an undesirable effect on other properties. Hence the specification of one particular fatty acid profile to improve all the properties of biodiesel is not possible. Considering the low-temperature properties and the oxidative stability, a combination of both saturated fatty acids and unsaturated fatty acids is necessary. Therefore, it is important to decide whether a biodiesel should contain a larger amount of saturated fatty acid esters or unsaturated fatty acid esters in order to obtain better fuel properties. The inherent genetic modification of the fatty acid profile could be the best possibility for addressing several fuel property issues simultaneously.

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Section: Heat Of Combustionmentioning

confidence: 98%

“…(Continued) Source: Reproduced with kind permission from Freedman and Bagby 68. Copyright Ó 1989, American Oil Chemists' Society.…”

mentioning

confidence: 99%

Effects of the properties and the structural configurations of fatty acid methyl esters on the properties of biodiesel fuel: a review

Gopinath

Krishnamurthy

Velraj

et al. 2014

Proceedings of the Institution of Mechanical Engineers, Part D:

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“…i Empirical equations are available to predict gross heats of combustion (HG) [23] using the number of valence electrons (N ). j Empirical equations were used to calculate these quantities [23], and compared to those measured [14].…”

Section: Selection Of Field Sites: Pedogenic End-membersmentioning

confidence: 99%

Estimation of temperatures beneath archaeological campfires using carbon stable isotope composition of soil organic matter

Werts

Jahren

2007

Journal of Archaeological Science

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“…Many attempts have hence been made to develop heating value prediction models based on experimental data. The HHVs of different biodiesel fuels have been measured and calculated by Freedman et al [19] and Krisnangkura [21] using a Parr adiabatic calorimeter according to ASTM D240 and D2015 standards. They developed a linear correlation between the heating value, carbon number and molecular weight, and they concluded that the HHV of biodiesel increased with increasing carbon number and molecular weight.…”

Section: Introductionmentioning

confidence: 99%

LHV predication models and LHV effect on the performance of CI engine running with biodiesel blends

Tesfa

Mishra

et al. 2013

Energy Conversion and Management

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The heating value of fuel is one of its most important physical properties, and is used for the design and numerical simulation of combustion processes within internal combustion (IC) engines. Recently, there has been a significant increase in the use of dual fuel and blended fuels in compression ignition (CI) engines. Most of the blended fuels include biodiesel as one of the constituents and hence the objective of this study is to investigate the effect of biodiesel content to lower heating value (LHV) and to develop new LHV prediction models that correlate the LHV with biodiesel fraction, density and viscosity.Furthermore, this study also investigated the effects of the LHV on CI engines performance parameters experimentally. To achieve the above mentioned objectives density, viscosity and LHV of rapeseed oil biodiesel, corn oil biodiesel and waste oil biodiesel at different blend fraction values (B0, B5, B10, B20, B50, B75, and B100, where 'B5' denotes a blend of 5% biodiesel and 95% mineral diesel, etc) were measured as per EN ISO 3675:1998, EN ISO 3104:1996 and DIN 51900 standards. The engine experimental work was conducted on a four-cylinder, four -stroke, direct injection (DI) and turbocharged diesel engine by using rapeseed oil and normal diesel blends. Based on the experimental results, models were developed which have the capability to predict the 2 specific fuel consumption (BSFC) and thermal efficiency were analysed and it has been seen that for the neat biodiesel which its LHV is lower by 8% than diesel resulted in an increment of BSFC and thermal efficiency by 18% and 25% respectively.

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Heats of combustion of fatty esters and triglycerides

Cited by 94 publications

References 9 publications

Effects of the properties and the structural configurations of fatty acid methyl esters on the properties of biodiesel fuel: a review

Effects of the properties and the structural configurations of fatty acid methyl esters on the properties of biodiesel fuel: a review

Estimation of temperatures beneath archaeological campfires using carbon stable isotope composition of soil organic matter

LHV predication models and LHV effect on the performance of CI engine running with biodiesel blends

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