[BLDG-SIM] effect of window blinds on solar heat gain

[Graham & Megan]

Keep in mind that the adjustment factor will vary depending on the glass it sits behind. Behind high performance lowE DGUs you may only get a 5-10% improvement due to the shortwave inter-reflections between blind and lowE coating.  Also the majority of the solar load becomes an instantaneous space heat gain as apposed to maybe absorbing into a tiled floor ... so peak cooling loads could actually end up being higher if the above two affects are combined.
  ----- Original Message ----- 
  From: Alec Stevens 
  To: BLDG-SIM at GARD.COM 
  Sent: Thursday, September 28, 2006 5:01 AM
  Subject: [BLDG-SIM] effect of window blinds on solar heat gain


  Hi,

  Does anyone have any source that documents the effect of (interior) window blinds on solar heat gain?

  We are working on a project with motorized blinds that would respond to a photocell.  The blinds are a fabric mesh that allows 40% visible transmittance.

   

  Has anyone used a reliable factor to account for any reduction in solar heat gain from this type of window blind?

   

  Thanks for any info that you may have!

   

  Sincerely,

  Alec Stevens, PE, LEED AP

  DMI

  450 Lexington St., Newton, MA 02466

  p: 617-527-1525 x105 f: 617-527-6606

  e: astevens at dmiinc.com

   


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