ASTM D4529-01(2011)
(Test Method)Standard Test Method for Estimation of Net Heat of Combustion of Aviation Fuels
Standard Test Method for Estimation of Net Heat of Combustion of Aviation Fuels
SIGNIFICANCE AND USE
This test method is intended for use as a guide in cases where an experimental determination of heat of combustion is not available and cannot be made conveniently, and where an estimate is considered satisfactory. It is not intended as a substitute for experimental measurements of heat of combustion (Note 2).
Note 2—The procedures for the experimental determination of the gross and net heats of combustion are described in Test Methods D240 and D4809.
The net heat of combustion is a factor in the performance of all aviation fuels. Because the exhaust of aircraft engines contains uncondensed water vapors, the energy released by fuel in vaporizing water cannot be recovered and must be subtracted from gross heat of combustion determinations to calculate net heat of combustion. For high performance weight-limited aircraft, the net heat of combustion per unit mass and the mass of fuel loaded determine the total safe range. The proper operation of the aircraft engine also requires a certain minimum net energy of combustion per unit volume of fuel delivered.
Because the heat of combustion of hydrocarbon fuel-mixtures are slowly varying functions of the physical properties of the mixtures, the heat of combustion of the mixtures can often be estimated with adequate accuracy from simple field tests of density and aniline point temperature, without the elaborate apparatus needed for calorimetry.
The empirical quadratic equation for the net heat of combustion of a sulfur-free fuel was derived by the method of least squares from accurate measurements on fuels, most of which conformed to specifications for fuels found in Note 1 and were chosen to cover a range of values of properties. Those fuels not meeting specifications were chosen to extend the range of densities and aniline-point temperatures above and below the specification limits to avoid end effects. The sulfur correction was found by a simultaneous least-squares regression analysis of sulfur-containing fuels ...
SCOPE
1.1 This test method covers the estimation of the net heat of combustion at constant pressure in metric (SI) units, megajoules per kilogram.
1.2 This test method is purely empirical, and it is applicable only to liquid hydrocarbon fuels derived by normal refining processes from conventional crude oil which conform to the requirements of specifications for aviation gasolines or aircraft turbine and jet engine fuels of limited boiling ranges and compositions as described in Note 1.
Note 1—The estimation of the net heat of combustion of a hydrocarbon fuel from its aniline point temperature and density is justifiable only when the fuel belongs to a well-defined class for which a relationship between these quantities has been derived from accurate experimental measurements on representative samples of that class. Even in this class, the possibility that the estimates can be in error by large amounts for individual fuels should be recognized. The JP-8 fuel, although not experimentally tested, has properties similar to JP-5 and Jet A fuels and can be considered in the same class. The classes of fuels used to establish the correlation presented in this test method are represented by the following applications:
Fuel Specification Aviation gasoline fuels:Specification D910 Grades 80, 82, 100/130, and 115/145Specification D6227 DEF STAN 91–90 NATO Code F-18 Aviation turbine fuels: MIL-DTL-5624 JP-4, Avtag/FSIIDEF STAN 91–88 NATO Code F-40 JP-5, Avcat/FSIIMIL-DTL-5624 DEF STAN 91–86 NATO Code F-44
JP-8, Avtur/FSIIMIL-DTL-83133 DEF STAN 91–87 NATO Code F-34 Jet A, Jet A-1, AvturSpecification D1655 DEF STAN 91–91 NATO Code F-35
1.3 The net heat of combustion can also be estimated by Test Method D1405. Test Method D1405 requires calculation of one of four equations dependent on the fuel type with the precision equivalent to that of this test method.
1.4 The values stated in SI units are to be regarded as stan...
General Information
Standards Content (Sample)
NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
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Designation: D4529 − 01 (Reapproved 2011)
Designation: 381/97
Standard Test Method for
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Estimation of Net Heat of Combustion of Aviation Fuels
This standard is issued under the fixed designation D4529; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision.Anumber in parentheses indicates the year of last reapproval.A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope
JP-8, Avtur/FSII MIL-DTL-83133
DEF STAN 91–87
1.1 Thistestmethodcoverstheestimationofthenetheatof
NATO Code F-34
combustion at constant pressure in metric (SI) units, mega-
joules per kilogram.
Jet A, Jet A-1, Avtur Specification D1655
DEF STAN 91–91
1.2 Thistestmethodispurelyempirical,anditisapplicable
NATO Code F-35
only to liquid hydrocarbon fuels derived by normal refining
1.3 The net heat of combustion can also be estimated by
processes from conventional crude oil which conform to the
Test Method D1405. Test Method D1405 requires calculation
requirements of specifications for aviation gasolines or aircraft
of one of four equations dependent on the fuel type with the
turbine and jet engine fuels of limited boiling ranges and
precision equivalent to that of this test method.
compositions as described in Note 1.
1.4 The values stated in SI units are to be regarded as
NOTE1—Theestimationofthenetheatofcombustionofahydrocarbon
standard. No other units of measurement are included in this
fuelfromitsanilinepointtemperatureanddensityisjustifiableonlywhen
the fuel belongs to a well-defined class for which a relationship between standard.
these quantities has been derived from accurate experimental measure-
1.5 This standard does not purport to address all of the
ments on representative samples of that class. Even in this class, the
safety concerns, if any, associated with its use. It is the
possibility that the estimates can be in error by large amounts for
individual fuels should be recognized. The JP-8 fuel, although not responsibility of the user of this standard to establish appro-
experimentally tested, has properties similar to JP-5 and Jet A fuels and
priate safety and health practices and determine the applica-
can be considered in the same class.The classes of fuels used to establish
bility of regulatory limitations prior to use.
the correlation presented in this test method are represented by the
following applications:
2. Referenced Documents
Fuel Specification
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2.1 ASTM Standards:
Aviation gasoline fuels: Specification D910
D129Test Method for Sulfur in Petroleum Products (Gen-
Grades 80, 82, 100/130, and 115/145 Specification D6227
DEF STAN 91–90 eral High Pressure Decomposition Device Method)
NATO Code F-18
D240Test Method for Heat of Combustion of Liquid Hy-
drocarbon Fuels by Bomb Calorimeter
Aviation turbine fuels: MIL-DTL-5624
JP-4, Avtag/FSII DEF STAN 91–88 D611Test Methods for Aniline Point and Mixed Aniline
NATO Code F-40
Point of Petroleum Products and Hydrocarbon Solvents
D910Specification for Leaded Aviation Gasolines
JP-5, Avcat/FSII MIL-DTL-5624
DEF STAN 91–86 D941Test Method for Density and Relative Density (Spe-
NATO Code F-44
cific Gravity) of Liquids by Lipkin Bicapillary Pycnom-
3
eter (Withdrawn 1993)
D1217Test Method for Density and Relative Density (Spe-
cific Gravity) of Liquids by Bingham Pycnometer
D1250Guide for Use of the Petroleum MeasurementTables
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This test method is under the jurisdiction of ASTM Committee D02 on For referenced ASTM standards, visit the ASTM website, www.astm.org, or
Petroleum Products, Liquid Fuels, and Lubricants and is the direct responsibility of contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
SubcommitteeD02.05onPropertiesofFuels,PetroleumCokeandCarbonMaterial. Standards volume information, refer to the standard’s Document Summary page on
Current edition approved Dec. 1, 2011. Published April 2012. Originally the ASTM website.
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approved in 1985. Last previous edition approved in 2006 as D4529–01(2006). The last approved version of this historical standard is referenced on
DOI: 10.1520/D4529-01R11. www.astm.org.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
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D4529 − 01 (2011)
D1266TestMethodforSulfurinPetroleumProducts(Lamp 3. Summary of Test Method
Method)
3.1 The aniline point, density, and sulfur content of the
D1298Test Method for Density, Relative Density, or API
sample are determined by experimental test methods and the
Gravity of Crude Petroleum and Liquid Petroleum Prod-
net heat of combustion is calculated using the values obtained
6 ,7,8
ucts by Hydrometer Method
by these test methods based on reported correlations.
D1405Test Metho
...
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