Page 75 - GRIHA Manual Volume V - Introduction to National Rating System
P. 75
68 Griha Manual: Volume 5
• Check the given operating hours of the building and see if it is closer to the ‘9 a.m.–5 p.m.
for five days a week’ category or ‘24 hours for seven days a week’ category. whichever
category is closer, the ePi benchmark value for that category is taken. for example, a
building where the working hours are 10 hours daily for six days a week, is closer to ‘9
a.m.–5 p.m. for five days a week’ category than ‘24 hours for seven days a week’ category.
So, in this case, the ePi benchmark value for ‘9 a.m.–5 p.m. for five days a week’ category
should be used for the applicable climate type.
Possible errors
1) the climate type taken for simulation may differ from that specified in eCbC 2007 user manual.
2) there may be errors in the ePi calculation, for example,
a. Predicted annual energy performance of equipments may also be considered while
calculating the building ePi,
b. for mixed spaces (both aC and non aC areas) the areas considered for calculation may
not match with the actual areas of aC and non-aC spaces, and
c. mathematical error.
3) the built up area taken in the simulation model may differ from the actual built up area of
the building.
4) internal load schedules may not match the actual operating conditions.
5) envelope and system details fed in the simulation model may differ from that specified in
the supporting documentation.
Point allocation
two mandatory points should be awarded if the building complies with thermal comfort conditions
as per clause 14.1.2 and 14.1.3, and the benchmark ePi calculated as per clause 14.1.7 is achieved.
Appraisal 14.3.3
every 10% reduction in ePi of the building under a specified category shall fetch additional two
points to a maximum of eights points (40% reductions in ePi from the benchmark). (2–8 points)
Required documentation
1) annual predicted energy performance of the buildings, supported by the simulation results
from the software used.
Review checklist
1) Check the ePi calculation to check the % reduction in ePi from the benchmark.
Point allocation
two mandatory points should awarded when the building ePi meets the ePi benchmark set under
griha (as mentioned above in appraisal 14.3.2).
every 10% further reduction in ePi for respective cases shall fetch two additional points, to a
maximum of eight points.
reduction in energy consumption >=10% and < 20% of the benchmarked figure will fetch two points.
reduction in energy consumption >=20% and < 30% of the benchmarked figure will fetch four points.
reduction in energy consumption >=30% and < 40% of the benchmarked figure will fetch six points.
reduction in energy consumption >=40% of the benchmarked figure will fetch eight points.
• Check the given operating hours of the building and see if it is closer to the ‘9 a.m.–5 p.m.
for five days a week’ category or ‘24 hours for seven days a week’ category. whichever
category is closer, the ePi benchmark value for that category is taken. for example, a
building where the working hours are 10 hours daily for six days a week, is closer to ‘9
a.m.–5 p.m. for five days a week’ category than ‘24 hours for seven days a week’ category.
So, in this case, the ePi benchmark value for ‘9 a.m.–5 p.m. for five days a week’ category
should be used for the applicable climate type.
Possible errors
1) the climate type taken for simulation may differ from that specified in eCbC 2007 user manual.
2) there may be errors in the ePi calculation, for example,
a. Predicted annual energy performance of equipments may also be considered while
calculating the building ePi,
b. for mixed spaces (both aC and non aC areas) the areas considered for calculation may
not match with the actual areas of aC and non-aC spaces, and
c. mathematical error.
3) the built up area taken in the simulation model may differ from the actual built up area of
the building.
4) internal load schedules may not match the actual operating conditions.
5) envelope and system details fed in the simulation model may differ from that specified in
the supporting documentation.
Point allocation
two mandatory points should be awarded if the building complies with thermal comfort conditions
as per clause 14.1.2 and 14.1.3, and the benchmark ePi calculated as per clause 14.1.7 is achieved.
Appraisal 14.3.3
every 10% reduction in ePi of the building under a specified category shall fetch additional two
points to a maximum of eights points (40% reductions in ePi from the benchmark). (2–8 points)
Required documentation
1) annual predicted energy performance of the buildings, supported by the simulation results
from the software used.
Review checklist
1) Check the ePi calculation to check the % reduction in ePi from the benchmark.
Point allocation
two mandatory points should awarded when the building ePi meets the ePi benchmark set under
griha (as mentioned above in appraisal 14.3.2).
every 10% further reduction in ePi for respective cases shall fetch two additional points, to a
maximum of eight points.
reduction in energy consumption >=10% and < 20% of the benchmarked figure will fetch two points.
reduction in energy consumption >=20% and < 30% of the benchmarked figure will fetch four points.
reduction in energy consumption >=30% and < 40% of the benchmarked figure will fetch six points.
reduction in energy consumption >=40% of the benchmarked figure will fetch eight points.
