ISO/FDIS 50002-3

© ISO #### – All rights reserved
ISO/TC 301/WG 17
Secretariat: ANSI
Date: 2025-02-13
Energy audits —
Part 3:
Guidance for conducting an energy audit using ISO 50002-1 in
processes
FDIS stage
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ii
Contents
Foreword . iv
Introduction . v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Principles of energy auditing . 2
5 Performing an energy audit . 2
5.1 General . 2
5.2 Planning . 2
5.3 Opening meeting . 3
5.4 Data collection . 4
5.5 Measurement plan . 4
5.6 Site visit . 5
5.7 Analysis . 6
5.8 Reporting . 8
5.9 Closing meeting . 8
6 Competence of the energy auditor. 8
Annex A (informative) Data which can be collected . 10
Annex B (informative) Quality of measurement plan . 19
Annex C (informative) Representative energy sampling approach for multi-site organizations 21
Bibliography . 24

iii
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards
bodies (ISO member bodies). The work of preparing International Standards is normally carried out through
ISO technical committees. Each member body interested in a subject for which a technical committee has been
established has the right to be represented on that committee. International organizations, governmental and
non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the
International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.
The procedures used to develop this document and those intended for its further maintenance are described
in the ISO/IEC Directives, Part 1. In particular, the different approval criteria needed for the different types of
ISO documentsdocument should be noted. This document was drafted in accordance with the editorial rules
of the ISO/IEC Directives, Part 2 (see www.iso.org/directives).
Attention is drawnISO draws attention to the possibility that some of the elementsimplementation of this
document may beinvolve the subjectuse of (a) patent(s). ISO takes no position concerning the evidence,
validity or applicability of any claimed patent rights in respect thereof. As of the date of publication of this
document, ISO had not received notice of (a) patent(s) which may be required to implement this document.
However, implementers are cautioned that this may not represent the latest information, which may be
obtained from the patent database available at www.iso.org/patents. ISO shall not be held responsible for
identifying any or all such patent rights. Details of any patent rights identified during the development of the
document will be in the Introduction and/or on the ISO list of patent declarations received (see ).
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation of the voluntary nature of standards, the meaning of ISO specific terms and expressions
related to conformity assessment, as well as information about ISO's adherence to the World Trade
Organization (WTO) principles in the Technical Barriers to Trade (TBT), see www.iso.org/iso/foreword.html.
This document was prepared by Technical Committee ISO/TC 301, Energy management and energy
savingsavings.
This first edition, along with ISO 50002-1 and ISO 50002-2, cancels and replaces the first edition ISO
50002:2014.
A list of all parts in the ISO 50002 series can be found on the ISO website.
Any feedback or questions on this document should be directed to the user's national standards body. A
complete listing of these bodies can be found at www.iso.org/members.html.
iv
Introduction
An energy audit can help an organization identify opportunities to improve energy performance. It can be part
of a site-wide energy management system (EnMS). This document provides guidance for conducting an ISO
50002-1-based energy auditsaudit of processes.
There are many types of processes in industry and commerce. In general, energy is used:
— directly by a process, (e.g. (furnaces ,, direct fired dryers);
— indirectly by a process (e.g. heat exchange, distillation, extrusion), including the specific conditions of
production (e.g. start-up, shut-down, product change over, cleaning, maintenance, laboratory and product
transfer);
— directly by a commercial organization, (e.g. meal preparation process, TV broadcasting process, data
centre process, coffee roasting);
— utility processes (e.g. motor driven systems (fans, pumps, motors, compressors, etc.), steam, hot water),
including on-site power plants;
— product or service changeover, (e.g. change of production feed or production quality, start-up, shut down,
cleaning-in-place, sterilization);
— other processes (e.g. sterilization in hospitals, fume cupboards, laboratories).
NOTE The energy audits covered by this international standarddocument may be independent from energy
performance certification.
In this document, the following verbal forms are used:
• “shall” indicates a requirement;
• “should” indicates a recommendation;
• “may” indicates a permission;
• “can” indicates a possibility or a capacity.
v
Energy audits —
Part 3:
Guidance for conducting an energy audit using ISO 50002-1 in
processes
1 Scope
This document gives guidance on how to apply ISO 50002-1 to carry out energy audits of a process. It is
intended to be used in conjunction with, and is supplementary to, ISO 50002-1.
If buildings are included in the scope of the energy audit, the energy auditor can choose to apply ISO 50002-2.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content constitutes
requirements of this document. For dated references, only the edition cited applies. For undated references,
the latest edition of the referenced document (including any amendments) applies.
ISO 50002-1, Energy audits — Part 1: General requirements with guidance for use
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 50002-1 and the following apply.
ISO and IEC maintain terminologicalterminology databases for use in standardization at the following
addresses:
— ISO Online browsing platform: available at https://www.iso.org/obp
— IEC Electropedia: available at https://www.electropedia.org/
3.1
audit client
the audit client (the person or organization whothat commissions an energy audit)
Note 1 to entry: to entry. The audit client can be the owner, operator, process licensor and/or the service provider.
3.2
process
a process is a set of interrelated or interacting activities that use inputs to deliver an intended result
Note 1 to entry: to entry. This can include one or more production lines, laboratories, research centres, packaging and
warehouse sections with specific operational conditions and site transportation. An energy audit can be conducted on
selected processes or systems in an organization or site (3.4) or on all processes in an organization or site.
3.3
production process
all the steps, or some of the steps, necessary to manufacture a product, or an intermediate product, or a by-
product, or a co-product, or to deliver a service
Note 1 to entry: Production process can include specific facilities for health, safety and environmentenvironmental
pollution control.
3.4
site
processes (3.2) within the boundary of the organization
Note 1 to entry: This may include processes for pollution treatment, energy recovery and waste management.
3.5
utility
generation and distribution of energy necessary for the process (3.2) and auxilliaryauxiliary
4 Principles of energy auditing
The principles of ISO 50002-1 apply.
5 Performing an energy audit
5.1 General
The general requirements of ISO 50002-1 apply.
5.2 Planning
In processes, the audit client and the auditee can be different. Their roles and responsibilities in the process
can also be different. For example, a process can be owner operated and maintained by a single organization.
The process can also be owned, operated and maintained by different organizations.
The energy auditor should obtain a preliminary description of the site and the process from the organization
or from a site visit.
NOTE 1 The preliminary contact can be by telephone, webinar, meeting or other remote interactive discussions.
The energy audit scope and boundaries should be defined and agreed between the energy auditor and the
audit client. At a minimum:
a) the audit client should have operational control of the process, or should have the ability to influence and
seek the cooperation of the operator; and
b) the energy audit scope should cover energy use within the process and/or the interaction of energy use
with other energy use within the process. Optimization of some energy use while excluding others can
give misleading results.
Considerations for the audit scope and boundary include:
— processes included in the energy audit;
NOTE 2 A process can be defined as the whole process, part of a process, part of a system or a component.
— whether or not outsourced utilities are included in the energy audit;
— depending on the thoroughness of the energy audit, the need for a detailed energy audit to be carried out
for specific processes should be checked. The level of detail required by the audit client will impact on” to
the following:; in this case, reference should be made to the relevant standard.
— application;
1) business needs addressed;
— data collection;
— analysis;
— opportunities identification;
2) opportunities evaluation; and
3) outputs.
In this case, reference should be made to the relevant standard (see Bibliography).
For energy use not directly related to the process (e.g. storing, packaging, logistics, offices, research centre,
laboratorycentres, laboratories, transport), the energy auditor should agree with the organization on the
applicability of ISO 50002-2 (buildings) or ISO 50002-3. (processes); depending on the nature of the activities,
the auditor may also rely on the general framework of ISO 50002-1. This choicedecision and the agreed scope
should be clearly stated in the final energy audit report (see 5.85.8).).
ISO 50002-1,:—, Annex A, describes three different types of energy audit, each having a different level of
detailsdetail and thoroughness. The agreed level of details and thoroughnessdetail agreed by the parties will
have an impact on:
— application;
— business needs;
— data collection;
— analysis;
— opportunities identification;
— opportunities evaluation;
— outputs;
• the time on-site;
• choice of samples;
• level of modelling;
• requirement
...