[BLDG-SIM] EQuest question: glass conductance

[Ery Djunaedy]

All,

I want to know how EQuest calculates the conduction through the
multi-pane window that is defined through the glass library,
specifically which value is actually used as the conductance.

In the component tree "Glass Type" (spreadsheet view), we have the
"Glass Conductance" value specified (1.47 is the default value,
regardless how many panes the window have). This value exists even if
the glass specification is read from the library. If we click on the
detailed properties of the glass, the library will be read and we can
see the conductance of every layer the window has.

My question is, which value is used when EQuest calculates the
conduction from the window? Is it the "Glass Conductance" value (which
is 1.47 by default) or from the value from the library (which will be
different depending on how many layers the window has)?

I noticed that when I imported a new glazing from Window5, the new
window type will be given the default "Glass conductance" value of
1.47. I do not change this value because I assume EQuest will take the
conductance values of every layer from the library. Should I change
this manually? (If yes, this will reduce the benefit of having a
library)

Another question:
If we right click on the Glass Conductance cell, and view the default
value, there is a status bar message which says "amount of heat that
glass conducts (includes outside air film but not inside air film)".
If we choose the DOE2 help, however, Glass Conductance is "The
conductance of the glazing, excluding the outside air film
coefficient."

So which one is used by EQuest: including or excluding?

Regards,

Ery

======================================================
You received this e-mail because you are subscribed 
to the BLDG-SIM at GARD.COM mailing list.  To unsubscribe 
from this mailing list send a blank message to 
BLDG-SIM-UNSUBSCRIBE at GARD.COM