ISO/CIE FDIS 10916

Light and lighting – Energy performance of lighting in buildings — Calculation of the impact of daylight utilization

This document defines the calculation methodology for determining the monthly and annual amount of usable daylight penetrating non-residential buildings through vertical facades and rooflights and the impact thereof on the energy demand for electric lighting. This document is applicable for existing buildings and the design of new and renovated buildings. This document provides the overall lighting energy balance equation relating the installed power density of the electric lighting system with daylight supply and lighting controls (proof calculation method). The determination of the installed power density is not in the scope of this method, neither are controls relating, for instance, to occupancy detection. Provided the determination of the installed power density and control parameters using external sources, the internal loads by lighting and the lighting energy demand itself can be calculated. The energy demand for lighting and internal loads by lighting can then be taken into account in the overall building energy balance calculations: heating; ventilation; climate regulation and control (including cooling and humidification); heating the domestic hot-water supply of buildings. For estimating the daylight supply and rating daylight-dependent electric lighting control systems, a simple table-based calculation approach is provided. The simple method describes the division of a building into zones as required for daylight illumination-engineering purposes, as well as considerations on the way in which daylight supplied by vertical facade systems and rooflights is utilized and how daylight-dependent lighting control systems affect energy demand. Dynamic vertical facades with optional shading and light redirection properties are considered, i.e. allowing a separate optimization of facade solutions under direct insolation and under diffuse skies. For rooflighting systems, standard, static solutions like shed rooflights and continuous rooflights are considered. The method is applicable for different latitudes and climates. For standard building zones (utilizations), operation times are provided. For detailed analysis an approach to calculate the effect of daylight on the lighting energy demand on an hourly or sub-hourly basis is provided. Unlike the simple table-based annual calculation approach, which is regression based, this method relies on an emulation concept. Relevant quantities are modelled explicitly and are then interacting directly with sensors, actuators and functional elements of the BACS or are triggering user interaction. By this approach, model configuration and parametrization from the design stage can seamlessly be used in the BACS configuration. To support overall building performance assessment, additional daylight performance indicators on the overall building level are provided.

Lumière et éclairage — Performance énergétique de l'éclairage des bâtiments — Calcul de l'impact de l'utilisation de la lumière du jour

General Information

• Status: Not Published
• ICS: 91.160.01 - Lighting in general
• Technical Committee: ISO/TC 274 - Light and lighting
• Drafting Committee: ISO/TC 274/JWG 1 - Energy performance of lighting in buildings (joint working group with CIE-JTC 6)
• Current Stage: 5020 - FDIS ballot initiated: 2 months. Proof sent to secretariat
• Start Date: 17-May-2024
• Completion Date: 17-May-2024

Relations

• Revises: ISO 10916:2014 - Calculation of the impact of daylight utilization on the net and final energy demand for lighting
• Effective Date: 23-Apr-2020

Standards Content (Sample)

FINAL DRAFT
International
Standard
ISO/CIE FDIS
10916
ISO/TC 274
Light and lighting – Energy
Secretariat: DIN
performance of lighting in
Voting begins on:
buildings — Calculation of the
2024-05-17
impact of daylight utilization
Voting terminates on:
2024-07-12
Lumière et éclairage — Performance énergétique de l'éclairage
des bâtiments — Calcul de l'impact de l'utilisation de la lumière
du jour
RECIPIENTS OF THIS DRAFT ARE INVITED TO SUBMIT,
WITH THEIR COMMENTS, NOTIFICATION OF ANY
RELEVANT PATENT RIGHTS OF WHICH THEY ARE AWARE
AND TO PROVIDE SUPPOR TING DOCUMENTATION.
IN ADDITION TO THEIR EVALUATION AS
BEING ACCEPTABLE FOR INDUSTRIAL, TECHNO­
LOGICAL, COMMERCIAL AND USER PURPOSES, DRAFT
INTERNATIONAL STANDARDS MAY ON OCCASION HAVE
TO BE CONSIDERED IN THE LIGHT OF THEIR POTENTIAL
TO BECOME STAN DARDS TO WHICH REFERENCE MAY BE
MADE IN NATIONAL REGULATIONS.
Reference number
ISO/CIE FDIS 10916:2024(en) © ISO/CIE 2024

---------------------- Page: 1 ----------------------
FINAL DRAFT
ISO/CIE FDIS 10916:2024(en)
International
Standard
ISO/CIE FDIS
10916
ISO/TC 274
Light and lighting – Energy
Secretariat: DIN
performance of lighting in
Voting begins on:
buildings — Calculation of the
impact of daylight utilization
Voting terminates on:
Lumière et éclairage — Performance énergétique de l'éclairage
des bâtiments — Calcul de l'impact de l'utilisation de la lumière
du jour
COPYRIGHT PROTECTED DOCUMENT
RECIPIENTS OF THIS DRAFT ARE INVITED TO SUBMIT,
WITH THEIR COMMENTS, NOTIFICATION OF ANY
RELEVANT PATENT RIGHTS OF WHICH THEY ARE AWARE
© ISO/CIE 2024
AND TO PROVIDE SUPPOR TING DOCUMENTATION.
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
IN ADDITION TO THEIR EVALUATION AS
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on
BEING ACCEPTABLE FOR INDUSTRIAL, TECHNO­
LOGICAL, COMMERCIAL AND USER PURPOSES, DRAFT
the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below
INTERNATIONAL STANDARDS MAY ON OCCASION HAVE
or ISO’s member body in the country of the requester
TO BE CONSIDERED IN THE LIGHT OF THEIR POTENTIAL
ISO copyright office CIE Central Bureau TO BECOME STAN DARDS TO WHICH REFERENCE MAY BE
MADE IN NATIONAL REGULATIONS.
CP 401 • Ch. de Blandonnet 8 Babenbergerstraße 9/9A • A-1010 Vienna
CH-1214 Vernier, Geneva
Phone: [phone] Phone: [phone]
Fax: [phone]
Email: [e-mail] Email: [e-mail]
Website: www.iso.org Website: www.cie.co.at
Published in Switzerland Reference number
ISO/CIE FDIS 10916:2024(en) © ISO/CIE 2024

© ISO/CIE 2024 – All rights reserved
ii

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ISO/CIE FDIS 10916:2024(en)
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 2
4 Symbols, indices, and abbreviated terms . 4
4.1 Symbols .4
4.2 Indices and abbreviated terms .5
5 Proof calculation method . 6
5.1 Energy demand for lighting as function of daylight .
...

ISO/CIE FDIS 10916:2024(Een)
ISO TC 274/JWG 1
Secretariat: DIN
Date: 2024-03-0619
Light and lighting – Energy performance of lighting in buildings — Calculation of the impact of
daylight utilization

---------------------- Page: 1 ----------------------
ISO/CIE DIS 10916:2023(E)
© ISO 2023/CIE 2024
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: [phone]
Email: [e-mail]
Website: www.iso.orgwww.iso.org
Published in Switzerland
ii © ISO/CIE 2023 – All rights reserved

---------------------- Page: 2 ----------------------
ISO/CIE DIS FDIS 10916:2023(E2024(en)
Contents
Foreword . vi
Introduction . vii
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 2
4 Symbols, indices, and abbreviated terms . 4
4.1 Symbols . 4
4.2 Indices and abbreviated terms . 5
5 Proof calculation method . 5
5.1 Energy demand for lighting as function of daylight . 5
5.2 Subdivision of a building into zones . 7
5.3 Operating time . 8
5.4 Artificial lighting . 8
5.5 Constant illuminance control . 8
5.6 Daylight . 8
5.7 Occupancy dependency factor F . 9
O,n
6 Daylight Performance Indicator . 9
Annex A (informative) Simple calculation method . 10
A.1 General . 10
A.2 Building segmentation: Spaces benefiting from daylight . 12
A.3 Daylight supply factor for vertical facades . 15
A.3.1 Daylight factor classification . 15
A.3.2 Daylight supply factor . 20
A.3.2.1 General . 20
A.3.2.2 Luminous exposure ratios at different sites (climates and latitudes) .
...