[Equest-users] U values for fenestrations

Alex Krickx akrickx at seriousenergy.com
Tue Jan 3 09:25:41 PST 2012


Good morning Ali,

I believe that you do need to re-define the frame dimension and property in eQUEST. You can do this either in the Wizard mode (easier, but limited U-values to select from) or in the "Window Properties" screen in the detailed edit mode.

In the Wizard mode I typically will try a couple of the "named" frame types (AL, wood/vinyl, etc) to find one that has the conductance value that matches my frame. The way to check is: select a frame type, click Finish and go to the "Window Properties" screen and see if it matches your WINDOW output. If I can't find a good fit you'll need to manually enter the conductance values in the Detailed Edit mode.

The answer to your second question: The best way to check is comparing the Window Properties screen (below) with the WINDOW6 screen that gives information on your whole window (glass+frame).
[cid:image001.jpg at 01CCC9F9.A95EBE20]

Keep in mind that the window frame dimension is labeled PFD (Projected Frame Dimension) and is given in inches, while the frame width in eQUEST's "Window Properties" screen is in feet.

My last comment is that I recall having some trouble running parametric runs between windows with varying frame thicknesses. As I recall, changing the frame thickness would change the total window area (my goal was to change the frame thickness, while keeping the total window area constant). This may have been an eQUEST 3-63 problem though.

A final check can be done once the file is simulated - I would also suggest that you look carefully through the LV-H reports (there are two relevant sections) and the last page of the LV-D report as this can be used to confirm that what you simulated matches your expectations.

Hope this helps,
Alex

Alex Krickx, LEED AP
Building Energy Specialist
Serious Energy, Inc.
1250 Elko Dr, Sunnyvale, CA 94089
(t) 408.541.8124
akrickx at seriousenergy.com

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From: Ali Murat Tanyer [mailto:tanyer at metu.edu.tr]
Sent: Tuesday, January 03, 2012 2:35 AM
To: Alex Krickx; NKravik at willdan.com
Subject: Re: [Equest-users] U values for fenestrations

Dear Alex and Nikola,

Many thanks for your suggestions.

I have been trying to explore the LBL WINDOW6 program. It looks great. However I have a point to clarify:

If I import my fenestration data from the LBL WINDOW6 program should I define the frame dimension and U value again in the ""Window Properties" Screen"? Alex has pointed out that eQUEST does not import the frame data from the WINDOW6 report file.

How can we be sure about this?

Thanks




On 29/12/2011 18:43, Alex Krickx wrote:

Hi Ali,



I would suggest using WINDOW6 as Nikola suggests. You can vary the size of the window there to match the actual sizes and see what the U-value will be for the window assembly (glass+frame).



In WINDOW6 you can create a "DOE-2 Report" file that has the glass information. This can be imported into eQUEST. Be sure to define your frame-type and frame-width in eQUEST as I don't believe that it will import the frame data from your WINDOW6 report file.



There are other ways to input single U- and SHGC-values for windows, but my understanding is they don't contain the details of angular-dependent transmittance which is important to include.



You should be able to edit the frame conductance in the "Window Properties" Screen in the Detailed Edit mode (below)



[cid:image004.png at 01CCC9F6.D0A05CD0]



Regarding your last question about a variety of window sizes - you can create 3 windows in the Wizard mode, and they can be the same glass type of different sizes. If you have more than that, you will need to edit the windows by hand in the detailed mode. I find it easiest to create the correct # of windows first, and then manipulate them to the size I want (rather than creating new window objects in the detailed mode).



Let us know how you do!



Kind regards,

Alex Krickx


Alex Krickx, LEED AP
Building Energy Specialist
Serious Energy, Inc.
1250 Elko Dr, Sunnyvale, CA 94089
(t) 408.541.8124
akrickx at seriousenergy.com<mailto:akrickx at seriousenergy.com>

The information contained in this e-mail and any attachments may be confidential, proprietary and/or privileged. If you are not the intended recipient then you have received it in error and any review, distribution or copying of this message and any attachments is prohibited and you are to notify the sender immediately by reply e-mail and delete immediately this message and any attachments.






-----Original Message-----
From: equest-users-bounces at lists.onebuilding.org<mailto:equest-users-bounces at lists.onebuilding.org> [mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of Nikola Kravik
Sent: Thursday, December 29, 2011 7:03 AM
To: Ali Murat Tanyer; equest-users at lists.onebuilding.org<mailto:equest-users at lists.onebuilding.org>
Subject: Re: [Equest-users] U values for fenestrations



Hi Ali,

You may want to check the Windows 6 program from LBNL on the following link and play with the windows and framing for your checks.

http://windows.lbl.gov/software/window/6/index.html



Best,

Nikola



Nikola Kravik, LEED AP

Project Engineer



Willdan Energy Solutions

11875 Dublin Boulevard, Suite A-201

Dublin, California 94568

T. 925.556.2600 ext. 1228

C. 925.719.5883

F. 925.556.1444

nkravik at willdan.com<mailto:nkravik at willdan.com>

www.willdan.com/energy<http://www.willdan.com/energy>









-----Original Message-----

From: equest-users-bounces at lists.onebuilding.org<mailto:equest-users-bounces at lists.onebuilding.org> [mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of Ali Murat Tanyer

Sent: Thursday, December 29, 2011 5:32 AM

To: equest-users at lists.onebuilding.org<mailto:equest-users at lists.onebuilding.org>

Subject: [Equest-users] U values for fenestrations



Dear all,



I am trying to understand the best way to enter the U value of my

fenestrations as a whole system. The manufacturer specified the U value

of the glazing as 0.49 BTU/hr·ft2°F and the aluminium framing as 0.70

BTU/hr·ft2°F. I do not have the NFRC data of my fenestration.



I can enter the properties of the glazing however I couldn't find a way

to define the thermal properties of the aluminium framing. I have also

checked the detailed mode screens.



The dimensions of the fenestration varies in different locations. So

what is the best way to calculate and enter the U-factor for the overall

fenestration area (including glazing and framing)?



My aim is making my simulation as accurate as possible since I want to

compare the results with actual values.



Thanks in advance.



Ali

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