Page 69 - GRIHA Manual Volume V - Introduction to National Rating System
P. 69
62 Griha Manual: Volume 5
Possible errors
1) while calculating the daylighted area there may be overlapping of same area under different
zones.
2) Simulation parameters, such as sky condition (outdoor illuminance), internal reflectance,
may not be correct. external shading or any other obstruction may not have been considered
in the simulation model.
3) glass vlt may be incorrect.
Point allocation
two mandatory points should be awarded if the total daylighted area is > 25% of the living area
of the proposed building and recommended daylight factor (df) has been achieved. if the total
daylighted area is > 50% of the total living area, then one additional point can be awarded.
if the total daylighted area is > 75% of total living area, then one more additional point can be
awarded.
Appraisal 13.3.3
over design of lighting system is avoided as per clauses 13.2.7 and 13.2.9 (2 points – mandatory)
Required documentation
1) lighting level simulation result outputs for all areas to demonstrate lighting level compliance
with biS.
2) Certificate from architect/service consultant on compliance with clause 13.1.5.
Review checklist
1) Check the indoor lighting levels to ensure that the lighting levels are maintained as per the
recommendation in nbC, 2005.
2) Check the lPd values to ensure that they are as per the values prescribed in eCbC-2007.
3) in the simulation output files, check that the work plane height is between 0.75–0.85
m. higher work plane heights may show higher illumination levels than what is actually
achieved at the correct work plane height.
4) in the simulation output files, check that the value of Project maintenance factor is 0.8 for
non-air conditioned spaces and 0.9 for air conditioned spaces.
5) in the simulation output files, check that the room reflectance values have been taken as
recommended by SP 41.
Possible errors
1) the lux levels in the indoor areas may not meet the minimum level recommended in nbC,
2005.
2) incorrect design values (like project maintenance factor, room reflectance values and work
plane height) may be fed into the simulation input file.
Point allocation
two mandatory points should be awarded if over design of lighting system has been avoided and the
artificial lighting simulation demonstrates that the lighting levels in indoor spaces are maintained
as recommended in nbC, 2005.
Possible errors
1) while calculating the daylighted area there may be overlapping of same area under different
zones.
2) Simulation parameters, such as sky condition (outdoor illuminance), internal reflectance,
may not be correct. external shading or any other obstruction may not have been considered
in the simulation model.
3) glass vlt may be incorrect.
Point allocation
two mandatory points should be awarded if the total daylighted area is > 25% of the living area
of the proposed building and recommended daylight factor (df) has been achieved. if the total
daylighted area is > 50% of the total living area, then one additional point can be awarded.
if the total daylighted area is > 75% of total living area, then one more additional point can be
awarded.
Appraisal 13.3.3
over design of lighting system is avoided as per clauses 13.2.7 and 13.2.9 (2 points – mandatory)
Required documentation
1) lighting level simulation result outputs for all areas to demonstrate lighting level compliance
with biS.
2) Certificate from architect/service consultant on compliance with clause 13.1.5.
Review checklist
1) Check the indoor lighting levels to ensure that the lighting levels are maintained as per the
recommendation in nbC, 2005.
2) Check the lPd values to ensure that they are as per the values prescribed in eCbC-2007.
3) in the simulation output files, check that the work plane height is between 0.75–0.85
m. higher work plane heights may show higher illumination levels than what is actually
achieved at the correct work plane height.
4) in the simulation output files, check that the value of Project maintenance factor is 0.8 for
non-air conditioned spaces and 0.9 for air conditioned spaces.
5) in the simulation output files, check that the room reflectance values have been taken as
recommended by SP 41.
Possible errors
1) the lux levels in the indoor areas may not meet the minimum level recommended in nbC,
2005.
2) incorrect design values (like project maintenance factor, room reflectance values and work
plane height) may be fed into the simulation input file.
Point allocation
two mandatory points should be awarded if over design of lighting system has been avoided and the
artificial lighting simulation demonstrates that the lighting levels in indoor spaces are maintained
as recommended in nbC, 2005.
