HEAT OF COMBUSTION LIQUID HEAT CAPACITY OF PETROLEUM DISTILLATE FUELS: ASTM D2890
EXPLANATION
This is an empirical test based on calculations from Test Method ASTM D86 distillation data. This test method is not applicable at temperatures less than 0 ° F (-18° C) and greater than 60° F (16° C) above the volumetric average boiling point of the fuel.
TEST SUMMARY
The Watson characterization factor, K, is obtained from a graphical correlation relating determined Test Method ASTM D86 distillation data and K. The liquid heat capacity is obtained, either graphically or mathematically, from correlations relating calculated heat capacity, temperature at which it is being calculated, determined API gravity, and K.
TEST PRECISION
This test method has a repeatability of 0.01, and a reproducibility of 0.02 Btu/lb° F. The accuracy of this test method has been reported as within 4 % for straight-run petroleum fractions, and approximately 8 % for pure olefins.
No statement of bias is made.
