[Ibpsausa] Naturally Ventilated Garment Factory for 90.1 appendix G

[Nathan Kegel]

I'd add that 62.1 should also improve the guidance on naturally ventilated spaces.

In lieu of that happening, I'd recommend CIBSE Guides AM10 and AM13 for the design of natural ventilation and mixed mode systems.

While they won't necessarily help with your LEED submittal, they are really good guidance that will be useful if you plan on doing more nat vent/mixed mode designs.

Regards,

Nathan

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From: ibpsausa-bounces at lists.onebuilding.org [mailto:ibpsausa-bounces at lists.onebuilding.org] On Behalf Of Peter Simmonds
Sent: Thursday, May 10, 2012 6:10 PM
To: Shuchita Gupta
Cc: ibpsausa at lists.onebuilding.org
Subject: Re: [Ibpsausa] Naturally Ventilated Garment Factory for 90.1 appendix G

This is a logical approach, but I do not think the LEED Gestapo will fall for it. Also there is no real interpretation for complying with standard 55 in standard 90.1 other than addendum r which refers to conditioned spaces.
I would suspect that it will be argued that if you are not using the conditioning system for certain periods of the year then the base case should be similarly adjusted.
Nice try though and I would encourage both 90.1 and 55 to get together and work something out regarding the true application of natural ventilation.

Peter Simmonds, Ph.D., ASHRAE Fellow and DL
Head of the Advanced Technology Group,
IBE Consulting Engineers,
14130 Riverside drive, suite 201
Sherman Oaks, CA 91423
Tel; 818-305-3246
Mobile: 818-2191284

On May 9, 2012, at 3:19 PM, "Shuchita Gupta" <shuchita at leapsdc.com<mailto:shuchita at leapsdc.com>> wrote:
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
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