[Bldg-sim] eQuest 90.1 Window U Values

[Bishop, Bill]

Will the glass-conductance conversion method give the "assembly"
U-value?  I thought assembly U-value included the frame.  Also, what
would you do to get the assembly SHGC?

 

Why not just pick an existing glass type code after finding one that
most closely matches the desired assembly U-value and assembly SHGC?  I
can usually find one that is close to, if not exactly the same as, the
required values.  The best match I see from the DOE glass library for
U=0.57 and SHGC=0.39 is GTC 6840 - Double Pilkington Arctic
Blu/Air1/Clr6.

 

Select "Create another Glass Type Code" by right clicking on an existing
code in your component tree.  Then "Load Component from Library" and
pick 6840.  Then change the properties of the affected glass types to
reflect the change in glass type code (above the glass type codes as
listed in the component tree).

 

William Bishop, EIT, LEED(r) AP | Pathfinder Engineers LLP

Mechanical Engineer


3300 Monroe Ave., Suite 306 
Rochester, NY  14618

TEL (585) 218-0730 Ext. 114
FAX (585) 218-0737 

bbishop at pathfinderengineers.com

 

www.pathfinderengineers.com

P Please consider the environment before printing this email

________________________________

From: bldg-sim-bounces at lists.onebuilding.org
[mailto:bldg-sim-bounces at lists.onebuilding.org] On Behalf Of Aulbach,
John
Sent: Thursday, May 22, 2008 7:34 PM
To: Josh Greenfield; bldg-sim at lists.onebuilding.org
Subject: Re: [Bldg-sim] eQuest 90.1 Window U Values

 


Under DOE2 Help, Dictionary/Glass-Type..


 


GLASS-CONDUCTANCE


The conductance of the glazing, excluding the outside air film
coefficient. The conductance given in glass manufacturers' data sheets
usually includes the outside air film resistance for a wind speed of 7.5
mph (summer) or 15 mph (winter). Table 10 <javascript:TL_5625.HHClick()>
can be used to obtain the corresponding value of GLASS-CONDUCTANCE. For
example, if U(7.5 mph) = 0.64 Btu/ft2-hr-F, then GLASS-CONDUCTANCE =
0.79 (by interpolation). For U-values of different glazing types, see
manufacturers' data sheets or the ASHRAE 1989 Handbook of Fundamentals,
p. 27.16-17.

Table 10  
Correspondence between Glass manufacturers U-value and GLASS-CONDUCTANCE
(excluding outside air film) [all values are in Btu/ft2-hr-F (W/m2-K)]

U-Value
(including outside air film)

GLASS CONDUCTANCE

(7.5 mph wind speed)

(15 mph wind speed)

0.1 (0.57)

0.10 (0.57)

0.10 (0.57)

0.2 (1.14)

0.21 (1.19)

0.21 (1.19)

0.3 (1.70)

0.33 (1.87)

0.32 (1.82)

0.4 (2.27)

0.45 (2.56)

0.43 (2.44)

0.5 (2.84)

0.59 (3.35)

0.55 (3.12)

0.6 (3.41)

0.73 (4.14)

0.68 (3.86)

0.7 (3.97)

0.89 (5.05)

0.81 (4.60)

0.8 (4.54)

1.05 (5.96)

0.95 (5.39)

0.9 (5.11)

1.23 (6.98)

1.09 (6.19)

1.0 (5.68)

1.43(8.12)

1.24 (7.04)

1.1 (6.25)

1.64 (9.31)

1.40 (7.95)

1.2 (6.81)

1.87 (10.62)

1.57 (8.91)

1.3 (7.38)

2.13 (12.09)

1.74 (9.88)

 

Josh:

Convert your GLASS-CONDUCTANCE to come up with the appropriate U-Value.

See the attached for an ASHRAE window I did.

Why didn't you start with the ASHRAE run as Base, rather than the
Proposed model first?

John R. Aulbach, PE, CEM

Project Manager

Nexant, Inc.

701 West Kimberly Ave., Suite 245

Placentia, CA 92870-6342 USA

Phone: 714-524-4402

Fax: 714-524-4407

email: jaulbach at nexant.com

 

 

 

 

________________________________

From: bldg-sim-bounces at lists.onebuilding.org
[mailto:bldg-sim-bounces at lists.onebuilding.org] On Behalf Of Josh
Greenfield
Sent: Thursday, May 22, 2008 3:42 PM
To: bldg-sim at lists.onebuilding.org
Subject: [Bldg-sim] eQuest 90.1 Window U Values

I'm to the point in an Energy Model where I'm changing my 'Proposed
Model' to my 'Baseline Model' and I'm having issues changing the window
data.  For the ASHRAE 90.1 region, the Assembly U value needs to be set
to 0.57 and the Assembly SHGC needs to be set to 0.39...where do I input
these numbers??  The only window data values eQuest is letting me change
is Glass Conductance, VLT and Emissivity...

 

 

Josh Greenfield, PE, LEED AP
Senior Associate
Primera Engineers, Ltd.
100 S. Wacker Drive, Suite 700
Chicago, IL 60606
312.606.0910 Main
312.242.6392 Direct
312.606.0415 Fax
jgreenfield at primerachicago.com
<blocked::mailto:jgreenfield at primerachicago.com> 
http://www.primerachicago.com <http://www.primerachicago.com> 

Be Green...please consider the environment before printing this email.

 

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