Environmental and health related criteria for buildings - ANEC

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IBO - Environmental and Health related Criteria for Buildings OPTION 4) Combination Any of the above calculation methods may be combined to document the minimum daylight illumination in at least 75% of all regularly occupied areas. The different methods used in each space must be clearly recorded on all building plans. In all cases, glare control devices shall be provided to avoid high-contrast situations that could impede visual tasks. IEQ Credit 8.2: Daylight and Views / Views (1 point) For earning an IEQ Credit 8.2 the space should be designed to maximize views opportunities. Strategies to consider include building lower partitions, high-ceiling reflectance values, interior glazing and automatic photocell-based controls. Determine the area with a direct line of sight by totaling the regularly occupied square footage that meets the following criteria: a) In plan view, the area is within sight lines drawn from perimeter vision glazing b) In section view, a direct sight line can be drawn from the area to perimeter vision glazing. Achieve a direct line sight to the outdoor environment via vision glazing between 30 inches and 90 inches above the finish floor for building occupants in 90% for all regulary occupied areas. The line of sight may be drawn through interior glazing. For private offices, the entire square footage of the office maybe counted if 75% or more of the area has a direct line of sight to perimeter vision glazing. For multi-occupant spaces, the actual square foot with a direct line of sight to perimeter vision glazing is counted. 9.7. DGNB Draft Criteria – residential buildings (May 2010) Visual Comfort is defined by the following parameters (weighting within the sub-category included): 1. Daylight availability (40%) 2. Views out (20%) 3. Color rendering index (20%) 4. Sun hours per day (20%) 1. Daylight availability Daylight is sufficiently available according to the guidelines of DGNB where a minimum average daylight factor of 1% for at least 50% of the occupied spaces (net floor area) is achieved. An average daylight factor of 2% for the same area defines the most ambitious requirement for residential buildings. The daylight factor is defined as illuminance due to daylight at a point on the indoors working plane compared to the simultaneous outdoor illuminance on a horizontal plane from an unobstructed hemisphere of overcast sky in %. Calculations are based on daylight simulation programmes. Final Report 100 31 03 2011
IBO - Environmental and Health related Criteria for Buildings As the daylight factor depends on the various parameters (e.g. specific geometry of each room, the degree of reflection of the room’s surfaces, the shading caused by overhangs, jutties and neighbouring buildings varying on each floor and façade) the evidence to provide for residential buildings to achieve an average daylight factor for at least 50% of the net floor area is rather complex. Evidence referring to the same type of rooms may lower the expenditure of time and costs for assessment. 2. Views out Views may not be limited by shading or glare devices. Assessment refers to manufacturer’s data or photo documentation. 3. Color rendering index The color rendering index of shading or glare devices and glazings has to exceed 90 as maximum requirement and 80 as minimum requirement. 4. Sunlight penetration (wintertime) The minimum requirement is more than 1 hour winter sun on January 17th (according to DIN 5034-1) for at least 1 room for 80% of the dwellings. The maximum requirement is 4 hours on January 17 th . Evidence must be provided for the centre of the window in parapet height within the façade plane. 9.8. TQB TQB evaluates the access to daylight for residential buildings by two complementary indicators as follows: 1) Daylight Factor: At least, a point daylight factor >= 2% has to be achieved for the living rooms (in 2m room depth, 1m distance from a side wall, reference plane: 0.85m) for more than 85% respectively 25% of the dwellings (as maximum or minimum requirement). The day light factor is influenced by the light transmission value of the glazings, geometry and degree of reflection of the room’s surfaces, shadings through overhangs (balconies, roofs,..), obstructions by neighbouring buildings, trees, landscape,…. 2) Winter Sun: On 21 st december more than 1.5 sun hours per day have to be achieved in the living rooms for more than 85% respectively 25% of the dwellings (as maximum or minimum requirement). Evidence is provided by calculations in the design stage and on-site measurements after construction. The highest requirement levels of both indicators award 50 of 1000 available points (resulting in 5.0% overall weighting). Within the subsection Health and Comfort, daylighting issues are Final Report 101 31 03 2011
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Environmental and health related criteria for buildings - ANEC

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