Environmental and health related criteria for buildings - ANEC

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IBO - Environmental and Health related Criteria for Buildings other service-rooms. The evidence to provide is a technical report from a professional technician reporting the list of rooms taken into consideration, the assessment method used and the result values. The definition of the daylight factor refers to sky component, externally reflected and internally reflected component. The point to consider is not determined, at all (plane of façade/window or in a room-depth of x metres, center of the window, height above floor,..). Therefore, the indicated benchmarks cannot be evaluated. It is striking that the requirement for common areas is higher (daylight factor > 5%) than for occupied spaces in residential buildings (> 3%) which probably takes into account the larger size and room-depth of halls, staircases, etc. This would speak for point daylight factors within the window plane. Apart from point daylight factors, to which the calculations probably refer, it is not unusual to indicate an average daylight factor of a room in the height of a reference plane (above floor). In this case, the requirement for rooms within dwelling units should be higher than for common areas. Daylight Clare Control Rooms used during the day in residential buildings shall have a Daylight Glare Index (DGI) 60 lower than 20. The calculation takes into account the luminance of each part of the light source, the average luminance of the surfaces in the environment, within the field of view, the weighted average luminance of the window, in function of the relative areas of sky, obstruction and ground. The criterion explicitly applies to offices and school rooms and is limited in residential buildings to rooms used during the day as glare limitation is only required for daylight but not for other light sources. Glare control indicators are often not assessed within rating systems applicable only for buildings for residential purposes (such as BREEAM Ecohomes/CSH, LEED for Homes, TQB, DGNB,..) as inhomogenous distribution of illuminance is mainly a problem of working places and areas where high visual tasks are to fulfil. Nevertheless, depending on regional climatic conditions and the use of rooms within building units or dwellings (e.g.for homeoffices) glare control is a topic of increasing relevance. Lighting system control The criterion as defined in the Third Draft of EU Ecolabel is more an energy-efficiency issue than an indicator for health and well-being. The control of lighting systems is not linked to daylight provision which could be a useful amendment for working spaces and homeoffices in residential buildings due to guarantee continuous illuminance levels during dusk/dawn or overcast sky. Daylight sensors are not assessed. SC = light from the patch of sky visible at the point considered, expressed as the sky component, ERC = light reflected from opposing exterior surfaces and then reached the point, expressed as the externally reflected component, IRC = light entering through the window but reaching the point only after reflection from internal surfaces, expressed as the internally reflected component. 60 Bellia L, Cesarano A., Iuliano G.F., Spada G., Daylight glare: a review of discomfort indexes, Detec – Università degli Studi di Napoli Federico II Final Report 94 31 03 2011
IBO - Environmental and Health related Criteria for Buildings The criterion refers only to common areas of the building (such as staircases, hallways etc.). Lighting systems in these areas shall be equipped with automatic shutdown (due to energy saving potentials). Motion detection sensors are not required which would be more comfortoriented. Integrated Well-Being EN 15251 defines benchmarks for thermal comfort, indoor air quality and ventilation rates, humidification/dehumidification, lighting and noise whereas the lighting section refers to EN 12464-1 and the illuminance defined therein for different visual tasks and building areas. Lighting requirements for residential buildings are explicitly excluded from the scope of standard EN 15251. 9.3. SBTool For residential buildings, daylighting is assessed for primary occupancy areas within the main category “D. Indoor Environmental Quality” besides issues like Indoor Air Quality, Ventilation and Air Temperature / Relative Humidity. Further lighting relevant criteria such as D 4.2. “Glare“ and D 4.3. „Illumination levels and quality of lighting” are not applicable for residential buildings (these issues are explicitly restricted to non-residential occupancies). The range of rating is defined as follows: The predicted Daylight Factor in the living area of a dwelling unit located on the ground floor shall be at least 2.0 % (acceptable practise) till 3.0% (best practise). The weighting of issues within SB-Tool is left to national teams which should adpapt this generic framework to local conditions. The weighting proposal for a tiny residential building (location Ottawa, Canada) classifies the daylighting topic rather low: 4.9 % within section D. Indoor Environmental Quality, 1.2% within the total system. Indoor air quality counts for 65.6%, ventilation for 19.7% and Air Temperature and Relative Humidity for at least 9.8%. Section D is weighted in the overall system by 25%. 9.4. Code for Sustainable Homes (CSH) Source: Code for Sustainable Homes: Technical Guide May 2009, Version 2 (ed. Department for Communities and Local Government, 2009) 61 Daylighting issues are treated within the main category “Health and Well-Being”, besides sound insulation, private space and lifetime homes. The credits to achieve are limited to 3 points (out of 104 total points), resulting in an overall weighting of 2.9%. The Code’s rating includes the following requirements: - Kitchens must achieve a minimum average daylight factor of at least 2% (1 point). 61 The analysis mainly refers to the edition 2009. In November 2010, a new version was issued: Code for Sustainable Homes: Technical guide – 2010 (there are no significant changes in daylight criteria). http://www.communities.gov.uk/publications/planningandbuilding/codeguide Final Report 95 31 03 2011
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