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RS ISO 1928: 2020
Coal and coke — Determination of gross calorific value

Abstract

This document specifies a method for the determination of the gross calorific value of a solid mineral
fuel at constant volume and at the reference temperature of 25 °C in a combustion vessel calorimeter
calibrated by combustion of certified benzoic acid.
The result obtained is the gross calorific value of the analysis sample at constant volume with all the
water of the combustion products as liquid water. In practice, fuel is burned at constant (atmospheric)
pressure and the water is not condensed but is removed as vapour with the flue gases. Under these
conditions, the operative heat of combustion is the net calorific value of the fuel at constant pressure. The
net calorific value at constant volume can also be used; formulae are given for calculating both values.
General principles and procedures for the calibrations and the fuel tests are specified in the main text,
whereas those pertaining to the use of a particular type of calorimetric instrument are described in
Annexes A to C. Annex D contains checklists for performing calibration and fuel tests using specified
types of calorimeters. Annex E gives examples illustrating some of the calculations. Annex F provides
guidance around safe use, maintenance and testing of the calorimeter combustion vessel.
NOTE Descriptors: solid fuels, coal, coke, tests, determination, calorific value, rules of calculation,
calorimetry

General Information

Code	Classification	Theme	Pages	Publisher	Availability
RS ISO 1928: 2020	ADOPTED ISO STANDARDS	Chemical technology	71	Forth Edition	Available