[Ibpsausa] Naturally Ventilated Garment Factory for 90.1 appendix G

[Shuchita Gupta]

We are looking to certify a garment factory in Dhaka which will not have
any conventional HVAC systems. We would like to know if the following
approach can be used for attempting LEED Optimize Energy Performance
Credits.

Our approach is to first calculate the number of hours of thermal comfort
as per ASHRAE- 55 . Then calculate energy costs for Baseline case as air
conditioned for all hours and compare it with the proposed case as
naturally ventilated for number of hours comfortable plus the cost for air
conditioning as per ASHARAE 90.1 (baseline case for HVAC).

For Eg – Building Runs for 8760 hrs a year and thermal comfort is met by
approx 1000hrs. (This will be derived using simulation software).
Baseline Case – Run simulation for 8760 hrs for ASHRAE 90.1 with Base case
HVAC system
Proposed Case – Run Simulation for 7760 hrs for ASHRAE 90.1with Base Case
HVAC System PLUS Run simulation for 1000 hrs with passive strategies.
So , basically the savings we will achieve will be mostly because of the
1000hrs of non use of air conditioning.

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Shuchita Gupta  | Energy Analyst  | LEED AP
Leap Sustainability Design Consulting
O - +91 80 4049 4251
www.leapsdc.com
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