[Bldg-sim] eQuest 90.1 Window U Values

[Kevin Kyte]

Can also interpolate to find the U-value for varying wind speeds?  The wind
speed number is found in the weather file hourly reports?

 

Kevin Kyte, LEED AP

RobsonWoese, Inc.

(T) 716-636-1800

(F) 716-636-1856

 <http://robsonwoese.com/index.php> http://robsonwoese.com

 

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
 <blocked::mailto:jgreenfield at primerachicago.com>
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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