Page 62 - GRIHA Manual Volume V - Introduction to National Rating System
P. 62
Evaluation procedure 55
CRIteRIon 13
optIMIze buIldInG desIGn
to ReduCe ConventIonAl
eneRGy deMAnd
GRIHA-speciic information
Objective
To apply climate-responsive building design measures, including daylighting and eicient
artificial lighting design, in order to reduce demand for conventional energy.
13.1 Commitment
13.1.1 in order to optimize the building design, appropriate climate-responsive design
strategies should be adopted, such as the following.
1. optimize the orientation of the building; and/or
2. Place the buffer spaces (such as, toilets, corridors, staircases, lifts, service areas, and so
on) along western and eastern façades; and/or
3. Provide maximum openings towards north and south; and/or
4. Shade the building surfaces receiving maximum solar exposure (such as wall, roof,
courtyard) with the use of external shading devices, for example, space frame, jaalis,
pergola, trees, green wall, terrace garden, and so on; and/or
5. design appropriate shading for all fenestrations getting direct solar radiation by
using sun path analysis or shading norms (prescribed in tables 9 and 10 of handbook
on functional requirements of buildings [other than industrial buildings] or SP41),
and so on.
13.1.2 the window-to-wall ratio (wwr) shall be limited to a maximum of 60% of gross wall area
and the skylight-roof-ratio (Srr) shall be limited to a maximum of 5% of gross roof area
as prescribed in eCbC-2007.
13.1.3 Demonstrate that the efective solar heat gain coeicient (SHGC)* of the fenestration
(accounting for glazing, overhangs, and/or vertical fins) is compliant with the maximum
ShgC requirement prescribed by eCbC-2007. (refer table 13.1)
Table 13.1 SHGC requirements for vertical fenestration and skylight
Maximum SHGC
Climate WWR < 40% 40% < WWR < 60% 0% < SRR < 2% 2.1% < SRR < 5%
Composite 0.25 0.2 0.4 0.25
Hot-dry 0.25 0.2 0.4 0.25
Warm-humid 0.25 0.2 0.4 0.25
Moderate 0.4 0.3 0.61 0.4
Cold 0.51 0.51 0.61 0.4
Source Table 4.3 and Table 4.6; ECBC-2007
CRIteRIon 13
optIMIze buIldInG desIGn
to ReduCe ConventIonAl
eneRGy deMAnd
GRIHA-speciic information
Objective
To apply climate-responsive building design measures, including daylighting and eicient
artificial lighting design, in order to reduce demand for conventional energy.
13.1 Commitment
13.1.1 in order to optimize the building design, appropriate climate-responsive design
strategies should be adopted, such as the following.
1. optimize the orientation of the building; and/or
2. Place the buffer spaces (such as, toilets, corridors, staircases, lifts, service areas, and so
on) along western and eastern façades; and/or
3. Provide maximum openings towards north and south; and/or
4. Shade the building surfaces receiving maximum solar exposure (such as wall, roof,
courtyard) with the use of external shading devices, for example, space frame, jaalis,
pergola, trees, green wall, terrace garden, and so on; and/or
5. design appropriate shading for all fenestrations getting direct solar radiation by
using sun path analysis or shading norms (prescribed in tables 9 and 10 of handbook
on functional requirements of buildings [other than industrial buildings] or SP41),
and so on.
13.1.2 the window-to-wall ratio (wwr) shall be limited to a maximum of 60% of gross wall area
and the skylight-roof-ratio (Srr) shall be limited to a maximum of 5% of gross roof area
as prescribed in eCbC-2007.
13.1.3 Demonstrate that the efective solar heat gain coeicient (SHGC)* of the fenestration
(accounting for glazing, overhangs, and/or vertical fins) is compliant with the maximum
ShgC requirement prescribed by eCbC-2007. (refer table 13.1)
Table 13.1 SHGC requirements for vertical fenestration and skylight
Maximum SHGC
Climate WWR < 40% 40% < WWR < 60% 0% < SRR < 2% 2.1% < SRR < 5%
Composite 0.25 0.2 0.4 0.25
Hot-dry 0.25 0.2 0.4 0.25
Warm-humid 0.25 0.2 0.4 0.25
Moderate 0.4 0.3 0.61 0.4
Cold 0.51 0.51 0.61 0.4
Source Table 4.3 and Table 4.6; ECBC-2007
