[Equest-users] Exterior Air Film - glazing

[Nicholas Caton]

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:



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]
*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
<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] *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.





*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
<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/


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