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Re: [EnergyPlus_Support] Window U-6.81 & SHGC - 0.25



Jeremiah,

You are right. I went over the ASHRAE 90.1, 2004 and 2007 versions. Both the requirements, U-value and SHGC, are to be met. I must have read the standard too fast the first time around. :)

Niraj  

On Mon, Jul 16, 2012 at 1:13 PM, CleanTech Analytics <jeremiah@xxxxxxxxxxxxxxxxxxxxxx> wrote:
 

Narj, 

Not sure-but interested.. what table of 90.1 might I find the language?


Jeremiah D. Crossett
CleanTech Analytics

This document may contain valuable information proprietary to CleanTech Analytics which is private and confidential. It may not be shared, copied, stored or transmitted in any form without the prior written consent of CleanTech Analytics




On Mon, Jul 16, 2012 at 9:57 AM, Niraj Poudel <nirajpdl@xxxxxxxxx> wrote:
 

Jeremiah,


I was under the impression that, according to the ASHRAE 90.1, if you choose to meet the baseline standard you can have the SHGC of the window met, regardless of the U-value of the window. Please correct me if I am wrong.

Niraj


On Sun, Jul 15, 2012 at 2:35 AM, CleanTech Analytics <jeremiah@xxxxxxxxxxxxxxxxxxxxxx> wrote:
 

The requirement is for the maximum, so you would still comply- yet you would loose points for your baseline being "too efficient"

I wonder what approaches others have taken to make their baseline be no more then required..?







Jeremiah D. Crossett
CleanTech Analytics

This document may contain valuable information proprietary to CleanTech Analytics which is private and confidential. It may not be shared, copied, stored or transmitted in any form without the prior written consent of CleanTech Analytics




On Sat, Jul 14, 2012 at 10:49 PM, aberalvi <aberalvi@xxxxxxxxx> wrote:
 

For the baseline, climate zone 1B in ASHRAE 90.1-2007 requires the vertical glazing max. U-value to be 6.81 W/m2.K and SHGC 0.25, whereas the requirement for skylight is U-11.24 W/m2.K and SHGC - 0.36.

I enquired with the main E+ support website and came to know that it's not possible to model windows with a U-value greater than about 6.

I would like to know if there's any workaround for modeling the baseline window with such a high U-value or whether the baseline window can be modeled with U-value of about 6 and still comply.

Thanks,

Aber





--
Niraj Poudel, Architectural Engineer.
PhD student, PDBE Program.
Clemson University, Clemson, SC.






--
Niraj Poudel, Architectural Engineer.
PhD student, PDBE Program.
Clemson University, Clemson, SC.




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