[Equest-users] Exterior Air Film - glazing

Jones, Christopher cjones at halsall.com
Wed Dec 24 05:47:01 PST 2014


No problem Nick.  I’ve been reading those manuals for some 20 odd years and I still find things I didn’t know about.

Christopher Jones, P.Eng.
Tel: 416.644.4226 • Toll Free: 1.888.425.7255 x 527

From: Nicholas Caton [mailto:ncaton at catonenergy.com]
Sent: Tuesday, December 23, 2014 4:43 PM
To: Jones, Christopher; Omar ElRawy; equest
Subject: RE: [Equest-users] Exterior Air Film - glazing

Chris:

After backtracking to the old glossary… I’ve learned something today!  You are absolutely right, and thank you for pressing the point!

I had the mistaken impression the U-values prescribed by 90.1 were exclusive of air films, analogous to GLASS-CONDUCTANCE.  The LV-D reports, inclusive of the exterior air film (assuming a 7.5mph wind), actually ought match the prescribed gross assembly U-factor.  I’ll be updating some of my personal resources!

For anyone else interested, here shared are coefficients for a curve matching the DOE2 reference for converting between the two:
[cid:image001.png at 01D01F56.2EA15D40]

Omar,  I’ll leave it to you to decide how to proceed.  I have (successfully enough) addressed the exact same commentary multiple times by simply illustrating my inputs matched the prescribed values.  My heart was in the right place, but I (and perhaps my reviewers) did not realize the disconnect with the output reports was not simply a matter of an erroneous inclusion of air films.  I will be changing my ways moving forward, personally!

Kind regards, and happy holidays to everyone on the list!

~Nick

NICK CATON, P.E.
Owner

Caton Energy Consulting
  1150 N. 192nd St., #4-202
  Shoreline, WA 98133
  office:  785.410.3317
www.catonenergy.com

From: Jones, Christopher [mailto:cjones at halsall.com<mailto:cjones at halsall.com>]
Sent: Tuesday, December 23, 2014 5:33 AM
To: Nicholas Caton; Omar ElRawy; equest
Subject: RE: [Equest-users] Exterior Air Film - glazing

Nick,
Would you not agree that one should define the glazing Conductance in the eQuest input, not the glazing U-value?  That way the .sim file reported glazing U-value is closer to what is expected?

Christopher Jones, P.Eng.
Tel: 416.644.4226 • Toll Free: 1.888.425.7255 x 527

From: Nicholas Caton [mailto:ncaton at catonenergy.com]
Sent: Monday, December 22, 2014 4:46 PM
To: Jones, Christopher; Omar ElRawy; equest
Subject: RE: [Equest-users] Exterior Air Film

The LV-D reports (and others touching on windows/constructions) do indeed include an exterior air film.  I don’t know of a way to change that.

A quick screengrab of your (correct) inputs and a one-line explanation of that fact is probably your most expedient path forward for a LEED review response.

~Nick

NICK CATON, P.E.
Owner

Caton Energy Consulting
  1150 N. 192nd St., #4-202
  Shoreline, WA 98133
  office:  785.410.3317
www.catonenergy.com

From: Equest-users [mailto:equest-users-bounces at lists.onebuilding.org<mailto:equest-users-bounces at lists.onebuilding.org>] On Behalf Of Jones, Christopher
Sent: Monday, December 22, 2014 8:23 AM
To: Omar ElRawy; equest
Subject: Re: [Equest-users] Exterior Air Film

For glazing, you have to enter the GLASS-CONDUCTANCE into eQuest, not the glazing U-value.  See page 65 in the DOE22Vol2-Dictionary reference manual available for download at doe2.com<http://doe2.com>.


Christopher Jones, P.Eng.
Tel: 416.644.4226 • Toll Free: 1.888.425.7255 x 527

From: Equest-users [mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of Omar ElRawy
Sent: Monday, December 22, 2014 7:28 AM
To: equest
Subject: [Equest-users] Exterior Air Film

Dear all,
            I have a problem reporting baseline case for LEED submission, where the exterior walls and windows U-values in Report LV-D appears less than the ASHRAE G 90.1 values that I did enter to the model, and this is (as I think) because eQuest adds the exterior air-film effect to the assembly during the run.

My question is that; can I disable this eQuest calculation to see my input directly in LV-D report or not?

Thanks,
Omar ElRawy, LEED AP BD+C
LEED Project Manager
EA Sustainable Building Consultants
http://www.ea-buildingconsultants.com/

______________________________________________________________________
NOTICE: This communication and any attachments ("this message") may contain confidential information for the sole use of the intended recipient(s). Any unauthorized use, disclosure, viewing, copying, alteration, dissemination or distribution of, or reliance on this message is strictly prohibited. If you have received this message in error, or you are not an authorized recipient, please notify the sender immediately by replying to this message, delete this message and all copies from your e-mail system and destroy any printed copies.

______________________________________________________________________
NOTICE: This communication and any attachments ("this message") may contain confidential information for the sole use of the intended recipient(s). Any unauthorized use, disclosure, viewing, copying, alteration, dissemination or distribution of, or reliance on this message is strictly prohibited. If you have received this message in error, or you are not an authorized recipient, please notify the sender immediately by replying to this message, delete this message and all copies from your e-mail system and destroy any printed copies.

______________________________________________________________________
NOTICE: This communication and any attachments ("this message") may contain confidential information for the sole use of the intended recipient(s). Any unauthorized use, disclosure, viewing, copying, alteration, dissemination or distribution of, or reliance on this message is strictly prohibited. If you have received this message in error, or you are not an authorized recipient, please notify the sender immediately by replying to this message, delete this message and all copies from your e-mail system and destroy any printed copies.
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.onebuilding.org/pipermail/equest-users-onebuilding.org/attachments/20141224/228f3d8d/attachment.htm>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: image001.png
Type: image/png
Size: 40883 bytes
Desc: image001.png
URL: <http://lists.onebuilding.org/pipermail/equest-users-onebuilding.org/attachments/20141224/228f3d8d/attachment-0001.png>


More information about the Equest-users mailing list