ISO INTERNATIONAL STANDARD 50046 First edition 2019-02 General methods for predicting energy savings Méthodes genérales d'estimation des économies d'energie Reference number IS0 50046:2019(E) ISO @IS02019 IS0 50046:2019(E) COPYRIGHTPROTECTEDDOCUMENT @ ISO 2019 All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on the internet or an intranet, without prior written permission. Permission can be requested from either IsO at the address below or Iso's member body in the country of the requester. ISO copyright office CP 401 : Ch. de Blandonnet 8 CH-1214 Vernier, Geneva Phone: +4122 749 0111 Fax: +41 22 749 09 47 Email: copyright@iso.org Website: www.iso.org Published in Switzerland ii @ IS0 2019 - All rights reserved IS0 50046:2019(E) Contents Page Foreword ..V Introduction. ...vi 1 Scope. 2 Normative references 3 Terms and definitions 4 Objectives, context and principles of calculation of PrEs .5 4.1 Clarifying the objectives. .5 .5 4.2 Analysingthecontext 4.3 Principles.. .7 4.3.1 General. 4.3.2 Initial planning 7 4.3.3 Appropriate level of accuracy 4.3.4 Transparency and reproducibility .7 4.3.5 Reliability and validation. 5 Preparation and selection of the calculation method ..8 5.1 General. ..8 5.2 Identification of the stakeholders .10 5.3 Description of an EPIA .11 5.3.1 General. .11 5.3.2 General types of EPIA ..1 5.3.3 Boundaries of the EPIA and PrES ..11 5.3.4 Key questions about the planned implementation of EPIAs. ..12 5.4 Calculation objectives and required accuracy. ..12 5.5 Data availability and quality. .13 5.6 Selection of the calculation method. ..13 5.6.1 General types and choice of the calculation method ..13 5.6.2 Type of data analysis... ..13 5.6.3 Data collection techniques and sources. .14 5.6.4 Type of calculation formula or model. .14 5.7 Validation. ..16 6 Calculation process for an EPIA .18 6.1 General .18 6.2 Overall calculation process. .18 6.3 Determination of the EnB .18 6.3.1 General. .18 6.3.2 Types of EnB .19 6.3.3 Baseline period. .20 6.3.4 Determination and validation of the EnB 20 6.4 Determination of predicted energy consumption 21 6.5 Calculation of the PrES 22 6.5.1 Specifying the calculation assumptions. 22 6.5.2 Calculation 23 6.5.3 Documentation and validation. 23 6.6 PrES over the prediction period. .23 7 Aggregation of the PrES .24 7.1 General 24 7.2 Ensuring the consistency in aggregating PrES 25 7.3 Aggregation of PrES 25 7.4 Assessing the causality between an action plan, programme or policy and the EPIAs 27 7.5 Documentation and validation. 27 8 Quality and uncertainty .28 @ IS0 2019 - All rights reserved iii