[Ibpsausa] Naturally Ventilated Garment Factory for 90.1 appendix G

[Peter Simmonds]

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.

--
[https://mail.google.com/mail/u/0/?ui=2&ik=9af7ad894b&view=att&th=13243e055cf5163e&attid=0.1&disp=inline&realattid=f_gsa8uyi21&zw]

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

_______________________________________________
Ibpsausa mailing list
Ibpsausa at lists.onebuilding.org<mailto:Ibpsausa at lists.onebuilding.org>
http://lists.onebuilding.org/listinfo.cgi/ibpsausa-onebuilding.org
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.onebuilding.org/pipermail/ibpsausa-onebuilding.org/attachments/20120510/b409dffd/attachment-0001.htm>