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Standards Development
Explanation on the revised scope of the revision: Based on the existing annual approach of ISO 10916 extend the standard to an hourly based (annual) estimation of the daylight supply in buildings. This is based on location and local climate data. It includes facades with and without shading systems, allows to model different daylighting control strategies including linkage with electric lighting systems (e.g. indoor occupation sensing) and appropriately interfaces with BACS formalism as from TC 205.
Revised Scope of ISO 10916 ‚
This International Standard defines the calculation methodology for determining the hourly, monthly and annual amount of usable daylight penetrating non-residential buildings through vertical facades, rooflights and sloped roofs and the impact thereof on the energy demand for electric lighting.
This International Standard can be used for existing buildings and the design of new and renovated buildings. The calculation methods given in this International Standard provide the connection of the daylight supply and lighting controls to the installed power density of the electric lighting system (proof calculation method) for the overall lighting energy balance equation according to ISO 20086. Set values (set points) of lighting controls are according to the lighting requirements of ISO/CIE 8995-1.
The determination of the installed power density is not in the scope of this method. The method allows to model different daylighting control strategies including linkage with other building automation control systems (BACS) (e.g. linkage to indoor occupation sensing for blind controls).
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 monthly and annual 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 effect energy demand. Selected dynamic vertical facade classes 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 a set of fixed locations and climates.
A comprehensive method allows to perform hourly, local climate weather based calculations with a generic facade, rooflight and sloped roof model including dynamic shading and protection of glare by daylight („3 Phase calculation“), which are in line with hourly calculation schemes for heating, ventilation, cooling. The method allows to model different daylighting control strategies including linkage with electric lighting control systems (e.g. linkage to indoor occupation sensing for blind controls). It formally interfaces with BACS formalism as in ISO 16484.
For standard building zones (utilizations), operation times and for the comprehensive method also occupancy patterns and requirements are provided.
The minimum requirements for detailed computer-based analysis are specified. To support overall building performance assessment, additional daylight performance indicators on the overall building level are provided.‘
Click here to enter text.In the general lighting context purpose and justification of the proposal are:
- Higher accuracy in advanced buildings like „Nearly Zero Energy Buildings“.
- Improved analysis and optimization possibilities of control strategies in all HVAC domains and lighting by better differentiated and matched loads and usage profiles under different climatic conditions.
- Improved analysis of overheating risks in summer.
- Improved modelling and optimization of „smart grids“ in combination with active energy systems like PV (in the scope of enhanced self-use), load management, energy contracting.
- Fostering the „Digitalization of buildings“, i.e. BACS / BIM etc.
- Support of energy service and contracting model by better predictions of lighting energy demands. In the specific lighting context purpose and justification of the proposal are:
- Dissimilar to other building trades
– no fast applicable, hourly, energy calculation and rating method is available.
- Restrictions in design of innovative lighting installations („Human Centric Light“ / „Smart & connected Light“, Light management (in combination with LED Solutions), Facade technology, Light as a service).
- Many advanced product features cannot anylonger be modelled with existing methods, this impedes planning and implementation of advanced energy efficient (day) lighting solutions, and impedes innovation in the market.
- Incompatible methods, restricting / or even preventing the further development of integral energy rating methods on national and as well international level.
- Better matching with modelling and rating of solar gains necessary (consistent models); today different, not consistent approaches are in use.
- In the end better and more efficient lighting and façade solutions for end-users and building owners.
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