ISO 18523-2:2018

INTERNATIONAL ISO
STANDARD 18523-2
First edition
2018-02
Energy performance of buildings —
Schedule and condition of building,
zone and space usage for energy
calculation —
Part 2:
Residential buildings
Performance énergétique des bâtiments — Plan et conditions
d'utilisation des espaces, zones et bâtiments pour le calcul
d'énergie —
Partie 2: Bâtiments résidentiels
Reference number
©
ISO 2018
© ISO 2018
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ii © ISO 2018 – All rights reserved

Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
3.1 Space . 2
3.2 Schedule . 3
3.3 Parameters for conditions of building, zone and space usage . 4
3.4 Descriptions for daily schedule . 5
4 Framework of the schedule and condition for building energy calculation .7
4.1 Indispensable schedules . 7
4.2 Daily schedule . 7
4.3 Division of year and daily, weekly, monthly, seasonal and annual allocations of
daily schedules . 9
5 Conditions for energy calculation included in the schedule and condition of zone
and space usage .11
5.1 Energy needs and uses .11
5.2 Condition .11
5.2.1 Occupancy or occupancy density .11
5.2.2 Operation of technical building systems and requirement for their services .12
5.2.3 Internal heat gains .14
5.2.4 Operation of movable fittings .15
5.3 Process for determining schedule and condition in housing units .15
5.3.1 Family structure .15
5.3.2 Time use of daily life of family member(s) .15
5.3.3 Schedule and area for space heating and cooling .16
5.3.4 Schedule and area of overall ventilation .16
5.3.5 Schedule and area of local exhaust ventilation .17
5.3.6 Amount of domestic hot water usage .17
5.3.7 Possession and usage of appliances .17
6 Category of residential building, zone and space .17
6.1 General .17
6.2 Category of space or zone .18
6.2.1 Categories of space or zone inside housing unit .18
6.2.2 Categories of space or zone outside housing unit .18
Annex A (informative) Examples of time use as daily life of family .19
Annex B (informative) Format of annual schedule by daily allocation of daily schedules .23
Annex C (informative) Examples of schedules for space heating and cooling .24
Annex D (informative) Example of schedule and area for local ventilation .25
Annex E (informative) Examples of schedule and condition for domestic hot water .26
Annex F (informative) Example of schedule and condition for usage of electric appliances .27
Annex G (informative) Examples of categories of space and zone of residential buildings .31
Bibliography .32
Foreword
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electrotechnical standardization.
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This document was prepared by Technical Committee ISO/TC 163, Thermal performance and energy use
in the built environment.
A list of all parts in the ISO 18523 series can be found on the ISO website.
iv © ISO 2018 – All rights reserved

Introduction
There is a strong need to improve the environment to make the evaluation of energy performance of
buildings more reliable and practical, so that energy efficiency of buildings is improved by referring
to the evaluation results. There have been no international standards prescribing building use in this
area. This document prescribes the indispensable information on the conditions for zone and space
usage in energy calculations for residential buildings.
INTERNATIONAL STANDARD ISO 18523-2:2018(E)
Energy performance of buildings — Schedule and
condition of building, zone and space usage for energy
calculation —
Part 2:
Residential buildings
1 Scope
This document specifies the formats to present the schedule and conditions of zone and space usage
(referred to as input data of energy calculations) for residential buildings.
The schedule and conditions include schedules of occupancy, operation of technical building systems,
ventilation rates, hot water usage, usage of appliances and internal heat gains due to occupancy, lighting
and appliances. The schedule and conditions for lighting are applicable to fixed installed lighting
fixtures.
This document also gives categories of residential building, zone and space according to differentiating
schedule and condition. For residential buildings or its housing units which contain any category of
space or zone of non-residential buildings, ISO 18523-1 applies.
Depending on necessary minuteness of the energy calculation, different levels of schedule and condition
from the view point of time and space averaging are specified.
The values and categories for the schedule and condition are included informatively.
NOTE The schedule and condition in this document is basically different from assumptions in order to
determine the size of technical building systems in the process of design, where possible largest or smallest values
are assumed. Instead, most usual and average values, which are assumed for the building energy calculation, are
dealt with in this document.
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 18523-1, Energy performance of buildings — Schedule and condition of building, zone and space usage
for energy calculation — Part 1: Non-residential buildings
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— IEC Electropedia: available at http:// www .electropedia .org/
— ISO Online browsing platform: available at http:// www .iso .org/ obp
3.1 Space
3.1.1
apartment block
building (3.1.2), which contains multiple housing units (3.1.8)
3.1.2
building
construction as a whole, including its envelope and all technical building systems (3.3.13), where energy
is used to condition the indoor environment, to provide domestic hot water and illumination and other
services related to the use of the building
3.1.3
building zone
zone
part of a building consisting of (part of) one or more spaces with assumed uniform properties related
to a specific service or service component, or (in absence of a service) assumed uniform indoor
environmental conditions
3.1.4
common space
indoor or outdoor space, which is commonly used by residents
3.1.5
thermally conditioned space
thermally conditioned zone
heated and/or cooled space (zone)
3.1.6
elementary space
space
part of a room, a room or group of adjacent rooms with assumed uniform properties for all considered
types of zones
3.1.7
habitable room
room that is continuously used for living, working, meeting, amusement and other purposes similar
thereto
Note 1 to entry: Spaces such as bathroom, washroom, toilet
...