Page 128 - GRIHA Manual Volume III - Introduction to National Rating System
P. 128
Annexures 121
AnnexuRe-5
Tables 9 and 10 of SP41
Table-9 of SP41: Spacing distances between vertical or horizontal members of louver systems (Southern Region)
Spacing between vertical or horizontal angle of inclination
Sr. Direction Type of Direction of Performance Recommended
No. louver B = 0° B = 15° B = 30° B = 45° B = inclination
60°
Cuts off after
A North V 3.73 P Inclining Not - 7 am during For air-conditioned
June and
buildings
case 1
desirable
completely in
other months
Cuts off
Case 2 V 2.15 P - do - - completely at do
all times
Completely
cuts off
B South H 1.73 P 2.3 P 2.73 P 2.46 P Downward summer sun Type H (B=0)
and allows
case 1
winter sun
indoors
Cuts off both
Towards summer and
winter sun
C East/ West V Inclining up to 30° Not 0.73 P 1.46 P north away cuts-off only Type C
desirable
case 1
from normal
downward after 7 am in
summer and
winter
Cuts off only
Case 2 H 0.27 P 0.54 P 0.85 P 1.27 P 2 P Downward after 7 am in
summer and
winter
Completely
cuts off
Case 3 C vertical Inclining up to 15° 0.21 P 0.64 P 1.37 P Away from summer sun Combination of types
but allows
normal
V(B=300) and H (B=00)
member
not desirable
toward south
winter sun
to come in
partially
Horizontal 0.84 P 1.11 P 1.42 P 1.84 P 2.57 P Downward - -
member
Winter sun
North-East/ Towards negligible on
D North West V 0.36 P 0.63 P 0.94 P 1.36 P 2.1 P north away this facade Type V(B=30)
Case 1 from normal and summer
sun cut off
Case 2 H 0.47 P 0.74 P 1.05 P 1.47 P 2.2 P Downward Cuts off only -
after 7 am
Completely
South -East Southward cuts off all
E / South C vertical 0.36 P 0.63 P 0.94 P 1.36 P 2.1 P away from summer sun
and allows
-West
member
Case 1 normal winter morning
sun partially
Horizontal 0.84 P 1.1 P 1.42 P 1.84 P 2.57 P Downward Combination of types
V(B=30°) and H (B=0°)
member
Note: In type C above , any combination of the angles of inclination of vertical and horizontal members is possible
AnnexuRe-5
Tables 9 and 10 of SP41
Table-9 of SP41: Spacing distances between vertical or horizontal members of louver systems (Southern Region)
Spacing between vertical or horizontal angle of inclination
Sr. Direction Type of Direction of Performance Recommended
No. louver B = 0° B = 15° B = 30° B = 45° B = inclination
60°
Cuts off after
A North V 3.73 P Inclining Not - 7 am during For air-conditioned
June and
buildings
case 1
desirable
completely in
other months
Cuts off
Case 2 V 2.15 P - do - - completely at do
all times
Completely
cuts off
B South H 1.73 P 2.3 P 2.73 P 2.46 P Downward summer sun Type H (B=0)
and allows
case 1
winter sun
indoors
Cuts off both
Towards summer and
winter sun
C East/ West V Inclining up to 30° Not 0.73 P 1.46 P north away cuts-off only Type C
desirable
case 1
from normal
downward after 7 am in
summer and
winter
Cuts off only
Case 2 H 0.27 P 0.54 P 0.85 P 1.27 P 2 P Downward after 7 am in
summer and
winter
Completely
cuts off
Case 3 C vertical Inclining up to 15° 0.21 P 0.64 P 1.37 P Away from summer sun Combination of types
but allows
normal
V(B=300) and H (B=00)
member
not desirable
toward south
winter sun
to come in
partially
Horizontal 0.84 P 1.11 P 1.42 P 1.84 P 2.57 P Downward - -
member
Winter sun
North-East/ Towards negligible on
D North West V 0.36 P 0.63 P 0.94 P 1.36 P 2.1 P north away this facade Type V(B=30)
Case 1 from normal and summer
sun cut off
Case 2 H 0.47 P 0.74 P 1.05 P 1.47 P 2.2 P Downward Cuts off only -
after 7 am
Completely
South -East Southward cuts off all
E / South C vertical 0.36 P 0.63 P 0.94 P 1.36 P 2.1 P away from summer sun
and allows
-West
member
Case 1 normal winter morning
sun partially
Horizontal 0.84 P 1.1 P 1.42 P 1.84 P 2.57 P Downward Combination of types
V(B=30°) and H (B=0°)
member
Note: In type C above , any combination of the angles of inclination of vertical and horizontal members is possible
