Re: [EnergyPlus_Support] Internal Windows Heat Gain/Loss

["David Scheer - L+U" <david@xxxxxxxxxxxxxx>]

Someone else should confirm or qualify the following, but what I have been looking at are:

- "Zone Diffuse from Interior Windows" and "Zone Beam from Interior Windows" for solar gains for the interior zone.  Of course, this is solar enegy through the glass, but not necessarily into the air, which only happens through convection from surfaces.
- "Surface Int Convection Heat Gain to Air" for the window in the interior zone may give you an approximation of conductive gains, but I have a feeling there should be some strong qualifications to using it this way, if anyone else can weigh in.  For one thing, this also includes energy that has radiated to the window surface from internal sources, and is then convecting from that surface.  It may be possible to clean up the approximation by deleting all internal gains.

DesignBuilder uses Window Heat Gain [W] - Window Heat Loss [W] - Window Transmitted Solar [W] to represent fabric gains of an exterior window.  Window Heat Gain/Loss supposedly includes both solar and conductive, but it appears to be more complex if there are interior windows, and needs some clarification.  Window Heat Gain/Loss is apparently different than Zone Window Heat Gain/Loss, as even when a window in an interior zone reports a value, the Zone Window Heat Gain/Loss are Null.

That doesn't answer your question, but I hope it can clarify future responses.


r3

  ----- Original Message ----- 
  From: Farhang Tahmasebi 
  To: EnergyPlus_Support@xxxxxxxxxxxxxxx 
  Sent: Friday, May 23, 2008 2:35 AM
  Subject: [EnergyPlus_Support] Internal Windows Heat Gain/Loss


  I wonder if anyone knows how can i get internal windows heat gain or 
  loss.
  I've a sunspace, which have some windows on the internal heat storage 
  wall, but I can't get total heat transfer (not only radiative) from 
  these internal windows. i mean these elements have high U-values and 
  therefore conduct a lot of heat in this way, not only in form of 
  radiation. In the case of external windows i use "windows heat 
  gain/loss" to have an idea of total heat transfer (conduction, 
  radiation, inside face convevtion), but here what can i do?



   

[Non-text portions of this message have been removed]


------------------------------------

The primary EnergyPlus web site is found at:
http://www.energyplus.gov

The group web site is:
http://groups.yahoo.com/group/EnergyPlus_Support/

Attachments are not allowed -- please post any files to the appropriate folder in the Files area of the Support Web Site.

EnergyPlus Documentation is searchable.  Open EPlusMainMenu.pdf under the Documentation link and press the "search" button.
Yahoo! Groups Links

<*> To visit your group on the web, go to:
    http://groups.yahoo.com/group/EnergyPlus_Support/

<*> Your email settings:
    Individual Email | Traditional

<*> To change settings online go to:
    http://groups.yahoo.com/group/EnergyPlus_Support/join
    (Yahoo! ID required)

<*> To change settings via email:
    mailto:EnergyPlus_Support-digest@xxxxxxxxxxxxxxx 
    mailto:EnergyPlus_Support-fullfeatured@xxxxxxxxxxxxxxx

<*> To unsubscribe from this group, send an email to:
    EnergyPlus_Support-unsubscribe@xxxxxxxxxxxxxxx

<*> Your use of Yahoo! Groups is subject to:
    http://docs.yahoo.com/info/terms/