Page 63 - GRIHA Manual Volume V - Introduction to National Rating System
P. 63
56 Griha Manual: Volume 5
the effective ShgC is calculated by multiplying the ShgC of the unshaded fenestration
product by a multiplication (m) factor. the m-factor for the proposed fenestration is
derived for each window dimension, orientation, and unique shading condition.
* SHGC is the ratio of the solar heat gain entering the space through the fenestration
area to the incident solar radiation, typically ranging from 0.9–0.1, where lower values
indicate lower solar gain. Solar heat includes directly transmitted solar heat and absorbed
solar radiation, which is then reradiated, conducted or convected into the space.
(Source Appendix A of ECBC-2007).
13.1.4 Ensure that the total daylighted area* (as deined in the Appendix A of ECBC-2007) of
the proposed building is > 25% of the total living area (areas listed in handbook on
functional requirements of buildings [other than industrial buildings] 1987 (SP41) part
4, table 2); and achieve the recommended df (as prescribed in handbook on functional
requirements of buildings [other than industrial buildings] 1987 (SP41) part 4, table 2)
at the centre of the daylighted area or the average on the daylighted area in a design sky
condition (as recommended in part 8 of national building Code 2005).
# every 25% increase in the total daylighted area upon the total living area—up to a
maximum of 75%—shall fetch one additional point. this is, however, non mandatory.
Note the daylight clause is not mandatory for all other living spaces that are not listed in table 2 (SP41). Projects are, however,
encouraged to apply daylight integration even if not mandated. Similar points shall be awarded for respective daylighted area as
mentioned above, and df can be decided based on project-specific daylight requirements.
Table 13.2 Recommended daylight factors for various living areas
Sl. No. Location Daylight factor
1 Dwellings
Kitchen 2.5
Living room 0.625
Study room 1.9
Circulation 0.313
2 Schools
Classroom desktop, blackboard 1.9–-3.8
Laboratory 2.5–3.8
3 Ofices
General 1.9
Drawing, typing 3.75
Enquiry 0.625–1.9
4 Hospitals
General wards 1.25
Pathological laboratory 2.5–3.75
5 Libraries
Stock room 0.9–1.9
Reading room 1.9–3.75
Counter area 2.5–-3.75
Catalogue room 1.9—2.5
Source Handbbook on Functional Requirements of Buildings (other than industrial buildings) 1987 (SP41) part 4, table 2 and IS: 2440- 1975.
Design sky condition: the recommended design sky illuminance for different climatic zone is as
follows.
the effective ShgC is calculated by multiplying the ShgC of the unshaded fenestration
product by a multiplication (m) factor. the m-factor for the proposed fenestration is
derived for each window dimension, orientation, and unique shading condition.
* SHGC is the ratio of the solar heat gain entering the space through the fenestration
area to the incident solar radiation, typically ranging from 0.9–0.1, where lower values
indicate lower solar gain. Solar heat includes directly transmitted solar heat and absorbed
solar radiation, which is then reradiated, conducted or convected into the space.
(Source Appendix A of ECBC-2007).
13.1.4 Ensure that the total daylighted area* (as deined in the Appendix A of ECBC-2007) of
the proposed building is > 25% of the total living area (areas listed in handbook on
functional requirements of buildings [other than industrial buildings] 1987 (SP41) part
4, table 2); and achieve the recommended df (as prescribed in handbook on functional
requirements of buildings [other than industrial buildings] 1987 (SP41) part 4, table 2)
at the centre of the daylighted area or the average on the daylighted area in a design sky
condition (as recommended in part 8 of national building Code 2005).
# every 25% increase in the total daylighted area upon the total living area—up to a
maximum of 75%—shall fetch one additional point. this is, however, non mandatory.
Note the daylight clause is not mandatory for all other living spaces that are not listed in table 2 (SP41). Projects are, however,
encouraged to apply daylight integration even if not mandated. Similar points shall be awarded for respective daylighted area as
mentioned above, and df can be decided based on project-specific daylight requirements.
Table 13.2 Recommended daylight factors for various living areas
Sl. No. Location Daylight factor
1 Dwellings
Kitchen 2.5
Living room 0.625
Study room 1.9
Circulation 0.313
2 Schools
Classroom desktop, blackboard 1.9–-3.8
Laboratory 2.5–3.8
3 Ofices
General 1.9
Drawing, typing 3.75
Enquiry 0.625–1.9
4 Hospitals
General wards 1.25
Pathological laboratory 2.5–3.75
5 Libraries
Stock room 0.9–1.9
Reading room 1.9–3.75
Counter area 2.5–-3.75
Catalogue room 1.9—2.5
Source Handbbook on Functional Requirements of Buildings (other than industrial buildings) 1987 (SP41) part 4, table 2 and IS: 2440- 1975.
Design sky condition: the recommended design sky illuminance for different climatic zone is as
follows.
