Page 76 - GRIHA Manual Volume III - Introduction to National Rating System
P. 76
Building and system design optimization 69
14.1.6 The annual predicted performance of energy systems in a non-air-conditioned building
(for day and 24 hour use) should not exceed the benchmarked energy performance
figures mentioned in table 14.4.
Table 14.4 Benchmark energy performance index (EPI) for non–air-conditioned buildings
Climate classiication EPI (kWh/m /year) EPI (kWh/m /year)
2
2
Daytime occupancy 24-hour occupancy
5 days a week 7 days a week
Non-air-conditioned buildings
Moderate 20 85
Composite/warm and humid/hot and dry 25 100
14.1.7 In a building that includes both air-conditioned and non-air-conditioned areas, the
annual predicted energy consumption of energy systems should not exceed the
benchmarked energy consumption limits listed in table 14.5.
Note: In a building that includes both air-conditioned and non-air conditioned areas, the annual energy performance of energy systems should not
exceed the benchmarked energy performance limits.
Table 14.5 Calculation of EPI for mixed-use building (both AC and non-AC)
Annual energy consumption data for the building
Type of space Area (m ) Energy performance (kWh/m /year)
2
2
Air-conditioned A1 E1
Non-air-conditioned* A2 E2
Total energy consumption (kWh/m /year) = (E1 × A1) + (E2 × A2) / A1+A2
2
* Non-air-conditioned includes both living and non-living space. However, the difference is that there is no requirement of thermal comfort analysis
for non-living spaces.
Benchmark calculation for mixed-use building (both AC and non-AC)
For composite climate and a daytime-occupied building (5 days a week), the benchmark EPI is 140 KWh/m /year for air-
2
conditioned area (A1) and 25 KWh/m /year for non-air conditioned area (A2).
2
Therefore, the benchmark of the building is calculated as follows.
Benchmark energy performance (kWh/m /year) = [(140 × A1) + (25 × A2)] / (A1+ A2)
2
14.1.8 For EPI calculation, energy systems which use fuels other than electricity, the predicted
annual fuel consumption value should be converted to kWh using the conversion factor
specified in Table 14.6.
Table 14.6 Energy conversion factors
Energy unit Conversion factors for kWh
Litres of LDO (light diesel oil) 8.3
Litres of HSD (high speed diesel) 8.5
Kilogramme of LPG (liqueied petroleum gas) 13.9
SCM (standard cubic metres) of PNG (pressurized natural gas) 7
14.1.6 The annual predicted performance of energy systems in a non-air-conditioned building
(for day and 24 hour use) should not exceed the benchmarked energy performance
figures mentioned in table 14.4.
Table 14.4 Benchmark energy performance index (EPI) for non–air-conditioned buildings
Climate classiication EPI (kWh/m /year) EPI (kWh/m /year)
2
2
Daytime occupancy 24-hour occupancy
5 days a week 7 days a week
Non-air-conditioned buildings
Moderate 20 85
Composite/warm and humid/hot and dry 25 100
14.1.7 In a building that includes both air-conditioned and non-air-conditioned areas, the
annual predicted energy consumption of energy systems should not exceed the
benchmarked energy consumption limits listed in table 14.5.
Note: In a building that includes both air-conditioned and non-air conditioned areas, the annual energy performance of energy systems should not
exceed the benchmarked energy performance limits.
Table 14.5 Calculation of EPI for mixed-use building (both AC and non-AC)
Annual energy consumption data for the building
Type of space Area (m ) Energy performance (kWh/m /year)
2
2
Air-conditioned A1 E1
Non-air-conditioned* A2 E2
Total energy consumption (kWh/m /year) = (E1 × A1) + (E2 × A2) / A1+A2
2
* Non-air-conditioned includes both living and non-living space. However, the difference is that there is no requirement of thermal comfort analysis
for non-living spaces.
Benchmark calculation for mixed-use building (both AC and non-AC)
For composite climate and a daytime-occupied building (5 days a week), the benchmark EPI is 140 KWh/m /year for air-
2
conditioned area (A1) and 25 KWh/m /year for non-air conditioned area (A2).
2
Therefore, the benchmark of the building is calculated as follows.
Benchmark energy performance (kWh/m /year) = [(140 × A1) + (25 × A2)] / (A1+ A2)
2
14.1.8 For EPI calculation, energy systems which use fuels other than electricity, the predicted
annual fuel consumption value should be converted to kWh using the conversion factor
specified in Table 14.6.
Table 14.6 Energy conversion factors
Energy unit Conversion factors for kWh
Litres of LDO (light diesel oil) 8.3
Litres of HSD (high speed diesel) 8.5
Kilogramme of LPG (liqueied petroleum gas) 13.9
SCM (standard cubic metres) of PNG (pressurized natural gas) 7
