ISO/TS TECHNICAL SPECIFICATION 16491 First edition 2012-12-01 Guidelines for the evaluation of uncertainty of measurement in air conditioner and heat pump cooling and heating capacity tests Lignes directrices pour I'évaluation de I'incertitude de mesure lors des essaisdepuissancefrigorifiqueetcalorifiquedesclimatiseursetdes pompesachaleur Reference number ISO/TS 16491:2012(E) @ISO2012 py IHS under lic ed without license from IHS Not for F ISO/TS 16491:2012(E) COPYRIGHTPROTECTEDDOCUMENT ISO2012 All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means, ISO's memberbody in the countryof the requester ISO copyright office Case postale 56. CH-1211 Geneva 20 Tel. + 41 22 749 01 11 Fax + 41 22 749 09 47 E-mail [email protected] Web www.iso.org Published in Switzerland @ ISO 2012 - All rights reserved y IHS unde nsee=University of Alberta/5966844001, User=sharabiani, shahramfs etworking permitted without license from IHS Not for Resale, 12/02/2013 05:00:27MST ISO/TS 16491:2012(E) Contents Page Foreword. .iv Introduction. 1 Scope. 2 Normative references. 3 Terms and definitions . 4 Symbols. 5 Method of calculation.. 5.1 Calibration.... 5.2 5.3 (Instrumental) drift... 5.4 Stability... 5.5 Uncertainty due to the lack of homogeneity 6 Explanatory notes useful in laboratory application.... 6.1 Uncertainty.... 6.2 Confidence level.. 6.3 Evaluation of errors... 6.4 Steps in evaluation of uncertainty in measurements 6.5 Uncertainty of measurements.... 5 L Evaluation of uncertainty - Calorimeter room method. 7.1 Cooling capacity test ... .8 7.2 Heating capacity test... 77 8 Evaluation of uncertainty Air enthalpy method... 1:4 8.1 Cooling capacity test ... .15 8.2 Heating capacitytest..... 8.3 Uncertainty of measurement on the air volume flow rate.. .18 Annex A (normative) Uncertainty budget sheets, ..19 Annex B (informative) Determination of indirect contribution to uncertainty, U(C)... .27 Bibliography. ..28 Copyrght International Organization for Standardization ghts reserved ili ed without license from IHS Not for