[BLDG-SIM] DOE Shading Question

Joe Huang YJHuang at lbl.gov
Thu Apr 10 12:05:01 PDT 2003


Wade,

The correct usage is the second one. The Visual Transmittance Schedue works the same as the Shading Schedule, except that it applies to the transmittance of light rather than heat. 

Joe 
  ----- Original Message ----- 
  From: Wade McLaughlin 
  To: BLDG-SIM at gard.com 
  Sent: Wednesday, April 09, 2003 8:14 AM
  Subject: [BLDG-SIM] DOE Shading Question


  In DOE-2, I'm a little unsure about how to use the Visual-Transmittance schedule with Shading and Daylight Dimming.

  Does the Visual-Transmittance schedule define the transmittance for the shading device (and window) for the portion of the window covered by the device (defined by the Shading-Schedule)?

  i.e. Do I define the VT value as if the entire window were covered by the shade, and DOE takes care of the rest using the Shading-Schedule?

  Or...

  Does it define the effective visual transmittance for the entire window?

  i.e. Do I need to define the effective VT for the entire window considering the shading fraction for each hour (taking the Shading-Schedule into account, which I've already defined)?

  As usual, many thanks,
  Wade

  Wade McLaughlin
  DMI
  450 Lexington St.
  Newton, MA  02466
  p 617-527-1525 x103
  f  617-527-6606

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