Comments on: The hunt for the right Passive House windows… http://blog.loadingdock5.com/?p=192 Fri, 03 Sep 2010 17:15:42 -0700 http://wordpress.org/?v=2.8.4 hourly 1 By: Dave http://blog.loadingdock5.com/?p=192&cpage=1#comment-1120 Dave Sun, 15 Nov 2009 16:57:21 +0000 http://blog.loadingdock5.com/?p=192#comment-1120 <i>assumption #1: As the U-values for a fiberglass frame and a triple gas-filled glass pane are not too different, we used the same U-value for both</i> I don't claim to be a consultant or an expert but if the U-values of the frame and the glass were the same, why would PHPP bother accounting for them separately? The glass performs significantly better than the frame in every PH window I've looked at. <i>assumption #2: Because the NFRC test size for a casement window is 600×1500mm and the frame thickness of the window is known, and assuming that the frames don’t contribute to solar gain, it’s possible to calculate the SHGC for the glass alone.</i> Not too bad an assumption, I think, but the out-of-plane depth of the frame can affect the amount of shading. Fascinating cost info, even for a European! assumption #1: As the U-values for a fiberglass frame and a triple gas-filled glass pane are not too different, we used the same U-value for both

I don’t claim to be a consultant or an expert but if the U-values of the frame and the glass were the same, why would PHPP bother accounting for them separately? The glass performs significantly better than the frame in every PH window I’ve looked at.

assumption #2: Because the NFRC test size for a casement window is 600×1500mm and the frame thickness of the window is known, and assuming that the frames don’t contribute to solar gain, it’s possible to calculate the SHGC for the glass alone.

Not too bad an assumption, I think, but the out-of-plane depth of the frame can affect the amount of shading.

Fascinating cost info, even for a European!

]]> By: admin http://blog.loadingdock5.com/?p=192&cpage=1#comment-1108 admin Fri, 30 Oct 2009 16:07:19 +0000 http://blog.loadingdock5.com/?p=192#comment-1108 Great! Thank you. Great! Thank you.

]]> By: Martin Holladay http://blog.loadingdock5.com/?p=192&cpage=1#comment-1107 Martin Holladay Fri, 30 Oct 2009 15:49:38 +0000 http://blog.loadingdock5.com/?p=192#comment-1107 To read more about Passive House windows, check out this article from GreenBuildingAdvisor: http://www.greenbuildingadvisor.com/blogs/dept/musings/passivhaus-windows To read more about Passive House windows, check out this article from GreenBuildingAdvisor:
http://www.greenbuildingadvisor.com/blogs/dept/musings/passivhaus-windows

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