ISO 18125:2017

Solid biofuels — Determination of calorific value

Publication date:   Apr 24, 2017

General information

90.60 Close of review   Sep 3, 2022

ISO

ISO/TC 238 Solid biofuels

International Standard

27.190   Biological sources and alternative sources of energy | 75.160.40   Biofuels

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ISO 18125:2017 specifies a method for the determination of the gross calorific value of a solid biofuel at constant volume and at the reference temperature 25 °C in a bomb 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, biofuels are burned at constant (atmospheric) pressure and the water is either not condensed (removed as vapour with the flue gases) or condensed. Under both conditions, the operative heat of combustion to be used is the net calorific value of the fuel at constant pressure. The net calorific value at constant volume may also be used; formulae are given for calculating both values.
General principles and procedures for the calibrations and the biofuel experiments are presented 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 experiments using specified types of calorimeters. Annex E gives examples to illustrate some of the calculations.

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PUBLISHED
ISO 18125:2017
90.60 Close of review
Sep 3, 2022