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From: Winfield Hill <hill@rowland.harvard.edu>
Newsgroups: sci.electronics.design
Subject: Re: Window Heater
Date: 12 Feb 2017 10:42:03 -0800
Organization: Rowland Institute
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rickman wrote...
>
> Now that I think of that, heating the space behind the
> plastic reminds me of your ultra fine temperature controller.
> You put the sensor and the heater at the thin spot in the
> insulation.  Heating the space in the window would
> completely stop the draft.
>
> The surprising part of the whole thing is just how small
> a temperature difference will result in a draft.  I only
> measure 2 or 3 degrees difference between the Styrofoam
> and other objects in the room, yet the draft forms when
> it is very cold out.  Likely the walls also create a 
> draft, but not as pronounced.  

 A wire-strip heater at the bottom could create an internal
 circulation to heat the small gap a little, and create a
 light surface draft that goes up instead of down.  Would
 such a draft also be a problem?


-- 
 Thanks,
    - Win