ISO INTERNATIONAL STANDARD 18125 First edition 2017-04 Solid biofuels Determination of calorific value Biocombustibles solides - Détermination du pouvoir calorifique Reference number ISO 18125:2017(E) International Organization for Standardization @ IS0 2017 =ZHEJIANG INST OF STANDARDIZATION C1 5956617 vided by IHS under lic Not for Resale, 2017/8/21 01:21:43 itted without license from IHS IS0 18125:2017(E) COPYRIGHTPROTECTEDDOCUMENT IS0 2017, Published in Switzerland All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized otherwise in any form written permission. Permission can be requested from either ISO at the address below or ISO's member body in the country of the requester. ISOcopyrightoffice Ch. de Blandonnet 8 . CP 401 CH-1214 Vernier, Geneva, Switzerland Tel. +41 22 749 01 11 Fax +41 22 749 09 47 copyright@iso.org www.iso.org Internatinair PrganizationforStandardization icensee-ZHEJIANG INSTOF STANDARDIZAoISQ07 -All rights reserved Not for Resale, 2017/8/21 01:21:43 etworking permitted without license from IHS IS0 18125:2017(E) Contents Page Foreword ..V 1 Scope 2 Normative references 3 Terms and definitions 4 Principle 4.1 Gross calorific value. .2 4.2 Net calorific value. 5 Reagents 6 Apparatus. ..4 7 Preparation of test sample .7 8 Calorimetric procedure .8 8.1 General .8 8.2 Preparing the bomb for measurement .10 8.2.1 General procedure .10 8.2.2 Using combustion aid ..10 8.3 Assembling the calorimeter. .11 8.4 Combustion reaction and temperature measurements. 11 8.5 Analysis of products of combustion .12 8.6 Corrected temperature rise . 12 8.6.1 Observed temperature rise ..12 8.6.2 Isoperibol and static-jacket calorimeters. ..12 8.6.3 Adiabatic calorimeters .14 8.6.4 Thermometer corrections .14 8.7 Reference temperature .14 9 Calibration .14 9.1 Principle. .14 9.2 Calibrant .15 9.2.1 Certification conditions .15 9.2.2 Calibration conditions ..15 9.3 Valid working range of the effective heat capacity e .15 9.4 Ancillarycontributions .16 9.5 Calibration procedure ..16 9.6 Calculation of effective heat capacity for the individual experiment. ..17 9.6.1 Constant mass-of-calorimeter-water basis ..17 9.6.2 Constant total-calorimeter-mass basis.. .17 9.7 Precision of the mean value of the effective heat capacity 18 9.7.1 Constantvalueof .18 9.7.2 as a function of the observed temperature rise ..19 9.8 Redetermination of the effective heat capacity ..19 10 Gross calorific value. ..19 10.1 General .19 10.2 Combustion .20 10.3 Calculation of gross calorific value 20 10.3.1 General. .20 10.3.2 Constant mass-of-calorimeter-water basis .20 10.3.3 Constant total-calorimeter-mass basis.. 22 10.3.4 as a function of the observed temperature rise 23 10.4 Expressionofresults 23 10.5 Calculation to other bases .23 11 Performance characteristics .24 Intematonal oganzation@sS2017 - All rights reserved iii nsee=ZHEJIANG INST OF STANDARDIZATION C1 5956617 d without license from IHS Not for Resale, 2017/8/21 01:21:43