Pearl Building Rating System - Estidama

Credit
Submission:
Construction
Rating
Calculations and
Methodology
� Extracts from specifications relating to construction thermal performance
parameters and building envelope air tightness specifications and air testing
methodology (where applicable); and
� Roof drawings and specifications confirming all roof areas except those covered by
mechanical plant, shading devices, renewable technologies and designated
vegetated roofs use materials with a SRI � 78.
� Updated narrative describing the passive design measures incorporated within the
project;
� Graph and results table illustrating incremental reductions in the as-built building’s
annual external heat gain (kWh/m 2 ) as outlined within the calculations and
methodology section;
� As-built drawings (section, plan and elevation) as necessary to fully describe all
passive design measures integrated into the building design;
� Manufacturers information relating to construction thermal performance
parameters and building envelope air tightness specifications and air testing results
(where applicable); and
� As-built roof drawings and specifications confirming all areas except those covered
by mechanical plant, shading devices, renewable technologies and designated
vegetated roofs use materials with a SRI � 78.
� Passive design measures are those which require no mechanical systems. This
includes, but is not limited to, orientation, fixed shading devices, improvements to
building fabric, air tightness etc.
� Reductions in external heat gain attributed to air tightness may only be included
based on the testing requirements as per RE-R1 Minimum Energy Performance.
� External heat gain is defined as the sum of solar gain, external conduction gain and
infiltration gain.
� Using the baseline building energy model developed within RE-R1 Minimum Energy
Performance, extract the baseline annual external heat gain (solar gain + external
conduction gain + infiltration gain) for each of the four baseline models (0, 90, 180,
270 degree rotations) and calculate the average baseline annual external heat gain.
� Introduce each of the following design measures to the baseline model incrementally
and document the effect each measure has on the annual external heat gain:
1 Orientation
2 Glazing ratio (both vertical fenestration and skylights)
3 Glazing solar heat gain coefficients (SHGC)
4 External shading
5 Building air leakage rate
6 Envelope conductive performance
7 Any other passive design measure not covered within points 1-6 above
� The total reduction in annual external heat gain is given as:
Pearl Building Rating System: Design & Construction, Version 1.0, April 2010 152 of 223