Page 43 - GRIHA Manual Volume III - Introduction to National Rating System
P. 43
36 GRIHA Manual: Volume 3
Step 3: Shading design
After finding out the critical façades of the building, the next step is to protect the façades and
fenestrations from direct solar radiation. Therefore, one can either provide complete shading to the
entire building surface or can provide shading to the respective fenestrations.
Step 4: Solar heat gain coeficient
The incident solar heat gain of a building is controlled by two major components of the building—
the window area (WWR and SRR) and the SHGC value of the fenestration. Therefore, both these
parameters should be as per GRIHA recommendations.
Step 5: Daylight simulation
After finalizing the area of opening (WWR and SRR), fenestration design (shading pattern) and
glazing properties (SHGC and VLT), the next step is to find out the available daylight level inside
the building. If the available daylight level is adequate and meets the GRIHA requirements, then
the VLT of glazing can be finalized. However, in case the available daylight level is not adequate or
the internal space is overlit, then the entire exercise needs to be repeated to arrive at appropriate
opening area/shading/VLT of glazing.
Step 6 Artiicial lighting analysis
The proposed artificial lighting design shall be analysed on the basis of its lighting level on task
plane, and energy consumption. The analysis result should ensure that the lighting level meets
the standards of luminance recommended by NBC-2005 and the lighting power density does not
exceed the LPD (w/m ) recommended by ECBC-2007. In any case, if the above mentioned standards
2
do not comply with the proposed lighting design, then the proposed lighting scheme shall be
revised based on the software simulations to make it more energy-efficient and effective.
Step 7: Integration of daylight controls*
To integrate daylight controls with artificial lighting, a control system should be adopted in areas
with adequate daylight zone throughout the day. Areas closer to the window shall receive adequate
daylight. Therefore, considerable savings can be achieved by introducing appropriate control
strategy. Following are some of the control strategies.
# Daylight with control such as manual On/Off switch or semi-automatic switch
# Daylight with automatic timer-based controls at the daylight illuminated zones
The flowchart below shows the various steps for building design optimization and analysis.
(* It may be noted that daylight controls are mandatory as per ECBC-2007 and, hence, mandatory under GRIHA as well.)
Step 3: Shading design
After finding out the critical façades of the building, the next step is to protect the façades and
fenestrations from direct solar radiation. Therefore, one can either provide complete shading to the
entire building surface or can provide shading to the respective fenestrations.
Step 4: Solar heat gain coeficient
The incident solar heat gain of a building is controlled by two major components of the building—
the window area (WWR and SRR) and the SHGC value of the fenestration. Therefore, both these
parameters should be as per GRIHA recommendations.
Step 5: Daylight simulation
After finalizing the area of opening (WWR and SRR), fenestration design (shading pattern) and
glazing properties (SHGC and VLT), the next step is to find out the available daylight level inside
the building. If the available daylight level is adequate and meets the GRIHA requirements, then
the VLT of glazing can be finalized. However, in case the available daylight level is not adequate or
the internal space is overlit, then the entire exercise needs to be repeated to arrive at appropriate
opening area/shading/VLT of glazing.
Step 6 Artiicial lighting analysis
The proposed artificial lighting design shall be analysed on the basis of its lighting level on task
plane, and energy consumption. The analysis result should ensure that the lighting level meets
the standards of luminance recommended by NBC-2005 and the lighting power density does not
exceed the LPD (w/m ) recommended by ECBC-2007. In any case, if the above mentioned standards
2
do not comply with the proposed lighting design, then the proposed lighting scheme shall be
revised based on the software simulations to make it more energy-efficient and effective.
Step 7: Integration of daylight controls*
To integrate daylight controls with artificial lighting, a control system should be adopted in areas
with adequate daylight zone throughout the day. Areas closer to the window shall receive adequate
daylight. Therefore, considerable savings can be achieved by introducing appropriate control
strategy. Following are some of the control strategies.
# Daylight with control such as manual On/Off switch or semi-automatic switch
# Daylight with automatic timer-based controls at the daylight illuminated zones
The flowchart below shows the various steps for building design optimization and analysis.
(* It may be noted that daylight controls are mandatory as per ECBC-2007 and, hence, mandatory under GRIHA as well.)
