Page 81 - GRIHA Manual Volume III - Introduction to National Rating System
P. 81
74 GRIHA Manual: Volume 3
for buildings in composite, hot and dry, and moderate climates, and for 60% of all occupied
hours for buildings in warm and humid climates.
In order to conduct thermal comfort analysis for non-air-conditioned spaces in the building,
hourly calculation should be performed for the whole year using the simulation software.
Thermal comfort analysis should be carried out and the total discomfort hours during
occupied period should be calculated. For summer season, occupancy hours during which
the temperature is more than 33 ºC and relative humidity is more than 70%, are considered as
discomfort hours. For winter season, occupancy hours during which the space temperature is
less than 15 ºC, are considered as discomfort hours.
14. In order to achieve the prescribed comfort limit, different thermal comfort enhancing strategies
should be applied. Using simulation software, parametric analysis of these strategies should be
conducted to understand their impacts. Impact of each strategy is studied with respect to two
parameters: improvement in the thermal comfort conditions and energy performance of the
building. This exercise helps in identifying strategies that contribute towards improving the
thermal comfort conditions as well as energy performance of the building. By comparing the
impacts of different strategies, the project team can arrive at decisions on strategies that will
have maximum impact on energy performance and enhancing thermal comfort conditions.
Following is a list of different strategies that contribute towards improving the thermal
comfort conditions as well as energy performance of buildings.
l Building design optimization: (Same as described above in AC buildings section)
l Building envelope optimization: (Same as described above in AC buildings section)
l Lighting system optimization: (Same as described above in AC buildings section)
l Improving natural ventilation: This refers to interventions related to modifications in
the building design to enhance natural ventilation inside the building. These include
strategies like modifying the size of openings, adding more openings, and so on. In
case adequate ventilation rates are not achieved by natural ventilation only, mechanical
ventilation strategies (like supply system, exhaust system or a combination of both) can
be used to achieve the required thermal comfort.
l Passive cooling strategies: These strategies that can be adopted for complying with the
thermal comfort conditions while ensuring energy efficiency (detailed description of
some of these strategies has been provided earlier in this document).
15. Once the strategies for improving the thermal comfort conditions as well as energy
performance of the building have been finalized and the thermal comfort conditions inside
the space meet the specified requirements, run the simulation software and generate annual
energy consumption profiles. Calculate the building EPI (kWh/m /year) based on the results
2
obtained through simulations.
From simulation results, get information on the total hours for which comfort conditions
are not met. This information should be provided as per the format given in GRIHA
Criterion 14 table 14.8.
16. Check if the building EPI value calculated based on the results obtained through simulations,
meets the EPI benchmark set under GRIHA for the specific building category.
for buildings in composite, hot and dry, and moderate climates, and for 60% of all occupied
hours for buildings in warm and humid climates.
In order to conduct thermal comfort analysis for non-air-conditioned spaces in the building,
hourly calculation should be performed for the whole year using the simulation software.
Thermal comfort analysis should be carried out and the total discomfort hours during
occupied period should be calculated. For summer season, occupancy hours during which
the temperature is more than 33 ºC and relative humidity is more than 70%, are considered as
discomfort hours. For winter season, occupancy hours during which the space temperature is
less than 15 ºC, are considered as discomfort hours.
14. In order to achieve the prescribed comfort limit, different thermal comfort enhancing strategies
should be applied. Using simulation software, parametric analysis of these strategies should be
conducted to understand their impacts. Impact of each strategy is studied with respect to two
parameters: improvement in the thermal comfort conditions and energy performance of the
building. This exercise helps in identifying strategies that contribute towards improving the
thermal comfort conditions as well as energy performance of the building. By comparing the
impacts of different strategies, the project team can arrive at decisions on strategies that will
have maximum impact on energy performance and enhancing thermal comfort conditions.
Following is a list of different strategies that contribute towards improving the thermal
comfort conditions as well as energy performance of buildings.
l Building design optimization: (Same as described above in AC buildings section)
l Building envelope optimization: (Same as described above in AC buildings section)
l Lighting system optimization: (Same as described above in AC buildings section)
l Improving natural ventilation: This refers to interventions related to modifications in
the building design to enhance natural ventilation inside the building. These include
strategies like modifying the size of openings, adding more openings, and so on. In
case adequate ventilation rates are not achieved by natural ventilation only, mechanical
ventilation strategies (like supply system, exhaust system or a combination of both) can
be used to achieve the required thermal comfort.
l Passive cooling strategies: These strategies that can be adopted for complying with the
thermal comfort conditions while ensuring energy efficiency (detailed description of
some of these strategies has been provided earlier in this document).
15. Once the strategies for improving the thermal comfort conditions as well as energy
performance of the building have been finalized and the thermal comfort conditions inside
the space meet the specified requirements, run the simulation software and generate annual
energy consumption profiles. Calculate the building EPI (kWh/m /year) based on the results
2
obtained through simulations.
From simulation results, get information on the total hours for which comfort conditions
are not met. This information should be provided as per the format given in GRIHA
Criterion 14 table 14.8.
16. Check if the building EPI value calculated based on the results obtained through simulations,
meets the EPI benchmark set under GRIHA for the specific building category.
