Energy performance of buildings -- Presentation of measured energy use of buildings

ISO 12655:2013 sets out a consistent methodology to present energy use in buildings, which is specified clearly with the energy usage, corresponding boundary and the energy data (presented with original energy carriers or equivalent energy). ISO 12655:2013 is applicable to the presentation of energy use of civil buildings for data collection, metering, statistics, audit and analysis.

Performance énergétique des bâtiments -- Présentation de l'utilisation énergétique réelle des bâtiments

General Information

Status
Published
Publication Date
05-Mar-2013
Current Stage
6060 - International Standard published
Start Date
04-Feb-2013
Completion Date
06-Mar-2013
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ISO 12655:2013 - Energy performance of buildings -- Presentation of measured energy use of buildings
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INTERNATIONAL ISO
STANDARD 12655
First edition
2013-03-01
Energy performance of buildings —
Presentation of measured energy use
of buildings
Performance énergétique des bâtiments — Présentation de
l’utilisation énergétique réelle des bâtiments
Reference number
ISO 12655:2013(E)
ISO 2013
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ISO 12655:2013(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2013

All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized otherwise in any form

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Published in Switzerland
ii © ISO 2013 – All rights reserved
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ISO 12655:2013(E)
Contents Page

Foreword ........................................................................................................................................................................................................................................iv

Introduction ..................................................................................................................................................................................................................................v

1 Scope ................................................................................................................................................................................................................................. 1

2 Normative references ...................................................................................................................................................................................... 1

3 Terms and definitions ..................................................................................................................................................................................... 1

4 Building energy use defined by usage ............................................................................................................................................ 2

4.1 Classification of building energy use by usage ............................................................................................................ 2

4.2 Energy for space heating ................................................................................................................................................................ 2

4.3 Energy for space cooling................................................................................................................................................................. 2

4.4 Energy for air movement ............................................................................................................................................................... 2

4.5 Energy for domestic hot water .................................................................................................................................................. 3

4.6 Energy for lighting ............................................................................................................................................................................... 3

4.7 Energy for household/office appliances ........................................................................................................................... 3

4.8 Energy for indoor transportation ........................................................................................................................................... 3

4.9 Energy for building auxiliary devices .................................................................................................................................. 3

4.10 Energy for cooking ............................................................................................................................................................................... 3

4.11 Energy for cooling storage ............................................................................................................................................................ 3

4.12 Energy for devices in data center............................................................................................................................................ 3

4.13 Energy for other specific functional devices ................................................................................................................. 3

5 Building energy use defined by boundary ................................................................................................................................. 4

5.1 Identification of building energy use by boundary ................................................................................................. 4

5.2 Heat/cold reaching the building space (E ) .................................................................................................................. 4

5.3 Energy delivered to the building’s technical system (E ) .................................................................................. 4

5.4 Energy input to the district heating/cooling system (E ) ................................................................................. 5

5.5 Renewable energy produced on the building site (E ) ........................................................................................ 5

5.6 Terms and symbols of the categories of building energy use determined by boundary ........ 5

6 Expression of energy carriers ................................................................................................................................................................. 7

6.1 Expression methods of energy carriers............................................................................................................................. 7

6.2 Presenting building energy use data with original energy carriers ......................................................... 7

6.3 Presenting building energy use data with equivalent energy ........................................................................ 7

7 Presentation of building energy use ................................................................................................................................................ 7

Annex A (normative) Symbols and abbreviations .................................................................................................................................. 8

Annex B (informative) Presentations of building energy use: examples.....................................................................10

Bibliography .............................................................................................................................................................................................................................14

© ISO 2013 – All rights reserved iii
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ISO 12655:2013(E)
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.

International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2.

The main task of technical committees is to prepare International Standards. Draft International

Standards adopted by the technical committees are circulated to the member bodies for voting.

Publication as an International Standard requires approval by at least 75 % of the member bodies

casting a vote.

Attention is drawn to the possibility that some of the elements of this document may be the subject of

patent rights. ISO shall not be held responsible for identifying any or all such patent rights.

ISO 12655 was prepared by Technical Committee ISO/TC 163, Thermal performance and energy use in

the built environment.
iv © ISO 2013 – All rights reserved
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ISO 12655:2013(E)
Introduction

This International Standard is prepared by ISO/TC 163,/WG 4, a joint group between ISO/TC 163, Thermal

performance and energy use in the built environment and ISO/TC 205, Building environment design.

It provides a set of clear definitions, terms and procedures for presenting the energy use in buildings in

a consistent and uniform way, including:

— Classifications of building energy use by purpose (e.g. energy for space heating, energy for cooking,

energy for lighting);

— Categories of energy use by boundaries inside or outside of buildings (e.g. actual heat/cold reaching

the building space (E ), energy delivered to the building’s technical system (E ), energy used by the

B T
district heating/cooling system (E );

— Building energy data shall be presented with original energy carriers or with equivalent energy,

and the indication (subscript) is required to make the data understandable.

Such a comprehensive expression of building energy use is of great importance for an in-depth

understanding of building energy performances and trends. And it is conducive to:

a) Regulating the presentation of the energy use of buildings with respect to data collection, metering

and analysis;

b) Providing a uniform platform for the assessment and comparison of building energy;

c) Laying the foundation of energy data collection, metering, statistics, audit and analysis for both

regional and national buildings.
The measuring methods are out of scope of this International Standard.
Relationship with ISO/TR 16344, ISO 16343 and ISO 16346

Three relevant International Standards, ISO/TR 16344, ISO 16343 and ISO 16346, were developed to

form a uniform platform for calculation and evaluation of building energy performance. However, some

ambiguities still exist, due to lack of uniform specifications, such as the classification of energy usage,

the boundaries related to the energy data, and the basis of the aggregation methods. Hence, the present

International Standard is complementary to these International Standards on energy rating and energy

performance. It provides common rules for how to present the energy uses, as a uniform platform for

exchanging information, without prescribing what has to be measured or assessed as it is the case for

procedures aiming at energy performance assessment and certification.

At the same time, the relevant terms, definitions and symbols in ISO/TR 16344, such as space heating,

space cooling and domestic hot water heating, are incorporated by reference in the present International

Standard, so as to be consistent with the existing International Standards.
© ISO 2013 – All rights reserved v
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INTERNATIONAL STANDARD ISO 12655:2013(E)
Energy performance of buildings — Presentation of
measured energy use of buildings
1 Scope

This International Standard sets out a consistent methodology to present energy use in buildings, which

is specified clearly with the energy usage, corresponding boundary and the energy data (presented

with original energy carriers or equivalent energy).

This International Standard is applicable to the presentation of energy use of civil buildings for data

collection, metering, statistics, audit and analysis.
2 Normative references

The following referenced documents are indispensable for the application 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/TR 16344, Energy performance of buildings — Common terms, definitions and symbols for the overall

energy performance rating and certification
3 Terms and definitions

For the purposes of this document, the terms and definitions given in ISO/TR 16344 and the following apply.

3.1
building energy

energy used during the operation of buildings, including the energy used for building basic functions

and the energy provided for occupant’s activities

EXAMPLE Examples of occupant’s activities include working, cooking, leisure, sanitation, etc.

Note 1 to entry: The energy used during the manufacture of building materials, the energy for material

transportation and the energy during building construction are not included.
3.2
energy usage
specific usage of building energy
EXAMPLE Space heating, space cooling, domestic hot water, lighting, etc.
3.3
boundary
position in relation to the energy usage chain of buildings
3.4
equivalent energy

equivalent value of the energy carrier used in buildings to combine or share different energy carriers

with the same platform according to the standardized conversion approach
© ISO 2013 – All rights reserved 1
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ISO 12655:2013(E)
4 Building energy use defined by usage
4.1 Classification of building energy use by usage

According to the energy usage in buildings, as shown in Figure 1, the total building energy use shall be

classified as the following:

— Energy for HVAC and domestic hot water, including energy for space heating, energy for space

cooling, energy for air movement and energy for domestic hot water.

— Energy for lighting and plug-in, including energy for lighting and energy for household/office appliances.

— Energy for other ultimate usage, including energy for indoor transportation and energy for building

auxiliary devices.

— Energy for other special usage, including energy for cooking, energy for cooling storage, energy for

devices in data center and energy for other specific functional devices.
Space heating
Space cooling
HVAC and
domestic hot water
Domestic hot water
Air movement
Lighting
Lighting and plug-in
Household/ofice appliances
Total building
energy use
Indoor transportation
Other ultimate usage
Building auxiliary devices
Cooking
Cooling storage
Other special usage
Devices in data center
Other speciic functional devices
Figure 1 — The usage of energy in buildings
4.2 Energy for space heating

The energy used to provide heat (including humidification) for space heating of the building shall be

energy for space heating.
4.3 Energy for space cooling

The energy used to provide cold (including dehumidification) for space cooling of the building shall be

energy for space cooling.
4.4 Energy for air movement

The energy used by the mechanical ventilation fans for building ventilation and air circulation shall

be energy for air movement. It includes electricity consumed by fans inside air handling devices (air

2 © ISO 2013 – All rights reserved
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ISO 12655:2013(E)

handling unit, outdoor air processor, fan coil unit, etc.), exhaust fans in toilet, ventilation fans in the

garage and other ventilated spaces.
4.5 Energy for domestic hot water

The energy used to produce and transport hot water for building domestic water service shall be energy

for domestic hot water.
4.6 Energy for lighting

The energy used by the lamp(s), control gear and control circuit in or associated with the luminaries

shall be energy for lighting. It includes the indoor lighting and exterior lighting. The indoor lighting is

usually composed of lighting for public space and private space.
4.7 Energy for household/office appliances

The energy used by the household and office appliances, such as personal computers, printers, drinking

fountains and TVs, shall be energy for household/office appliances.
4.8 Energy for indoor transportation

The energy used by the indoor transportation devices in buildings, such as lifts, escalators and passenger

conveyors, shall be energy for indoor transportation.
4.9 Energy for building auxiliary devices

The energy used by all kinds of the building auxiliary devices that serve the building, such as pumps for

water supply and drainage, automatic door, shall be energy for building auxiliary devices.

4.10 Energy for cooking

The energy used for cooking inside a building shall be energy for cooking. It includes the fuel and

electricity consumed by cooking utensils and exhaust fans in the kitchen.

NOTE The energy used by the exhaust fans in the kitchen doesn’t belong to the item of energy for air

movement anymore.
4.11 Energy for cooling storage

The energy used by the refrigeration devices for storage shall be energy for cooling storage.

4.12 Energy for devices in data center

The energy used by the devices in data centers inside the building, including servers and ancillary air-

conditioning, shall be energy for devices in data center.
4.13 Energy for other specific functional devices

The energy used by other specific functional devices, such as medical equipment, laundry equipment

and auxiliary devices of swimming pool, shall be energy for other specific functional devices.

© ISO 2013 – All rights reserved 3
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ISO 12655:2013(E)
5 Building energy use defined by boundary
5.1 Identification of building energy use by boundary

Considering energy flow through the buildings, the building energy use shall be defined according to

boundary, and the categories are as follows:
— Heat/cold reaching the building space (E );
— Energy delivered to the building’s technical system (E );
— Energy input to the district heating/cooling system (E );
— Renewable energy produced on the building site (E ).

Schematic of the categories of building energy use determined by the boundaries mentioned above are

shown in Figure 2.
E E
T B
District h
...

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