-----Original Message-----
From: bldg-sim@xxxxxxxx [mailto:bldg-sim@xxxxxxxx]
On Behalf Of Peter Alspach
Sent: Tuesday, December 19, 2006
1:34 PM
To: bldg-sim@xxxxxxxx
Subject: [bldg-sim] Modeling
buildings with natural ventilation for Appendix G
Mike,
Have you succeeded in getting a naturally
ventilated building through the USGBC with this method?
If so, I am sure all would be glad to hear
it.
Peter
From:
bldg-sim@xxxxxxxx [mailto:bldg-sim@xxxxxxxx] On
Behalf Of Mike Tillou
Sent: Tuesday, December 19, 2006
7:18 AM
To: bldg-sim@xxxxxxxx
Subject: [bldg-sim] Modeling
buildings with natural ventilation for Appendix G
The ASHRAE 90.1 ECB sub-committee is
working on a methodology for simulating natural ventilation within the
framework of Appendix G but I don't think its finished yet. In the
meantime here is what I would recommend.
Appendix G / 90.1 ECB allows you
to use an exception calculation method to simulate hybrid
systems or unique efficiency measures to demonstrate above-standard
performance. I think this would certainly apply in your case.
Here's what I have done on projects
requiring an exception calculation method.
1. Establish your energy cost budget
and your design energy case following the Appendix G
guidelines.
2. Create a second model using the Design
Energy Case as the baseline and make the necessary modifications to simulate
radiant heating / no cooling via natural ventilation.
3. Report the energy savings from your
exception calculation as a line item at the end of your LEED EA-1 summary table
(similar to how renewable energy is reported).
4. Include a seperate summary
table for the exception calculation showing the energy end-use
breakdown and how you arrived at the cost savings. Show both the
baseline and proposed energy use.
5. Make sure the savings are reasonable
and prudent for the system you are proposing.
6. Document any changes to the model
especially changes to schedules that were necessary to properly simulate your
system.
7. Make it easy for someone to review
your assumptions and the methodology you used to estimate the savings
I hope this helps. Good luck.
Michael Tillou, PE
ETC Group, Inc - Energy Engineering for a Sustainable Future
Ph:413-458-9870
-----Original Message-----
From: bldg-sim@xxxxxxxx [mailto:bldg-sim@xxxxxxxx]
On Behalf Of Ramana Koti
Sent: Monday, December 18, 2006
4:53 PM
To: bldg-sim@xxxxxxxx
Subject: [bldg-sim] Modeling
buildings with natural ventilation for Appendix G
Dear all,
Is ignoring natural ventilation in both proposed and baseline designs an
accepted/fair way of modeling based on Appendix G (ASHRAE 90.1-2004)?
Part of the proposed design has (radiant heating + natural ventilation) with no
cooling which was modeled as a radiant slab, no cooling, natural ventilation
ignored.
But the Baseline HVAC system based on Appendix G is System 5: Packaged VAV
w/Reheat. (Natural ventilation can be modeled based on Air Change method or
Sherman Grimsrud method though I do not know how to do it).
I cannot decide how to make the baseline and proposed comparable with respect
to Natural Ventilation (in a manner acceptable to LEED review), suggestions
will be appreciated.
Thanks,
Ramana Koti, Sustainable Building Analyst
LEED AP
ELEMENTS | a division of berkebile nelson immenschuh mcdowell architects
106 W. 14th Street Suite 200
Kansas City, Missouri 64105
p 816.783.1635 f 816.783.1501
www.bnim.com| elements.bnim.com
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