Groups > sci.electronics.design > #447692

Re: Window Heater

From	rickman <gnuarm@gmail.com>
Newsgroups	sci.electronics.design
Subject	Re: Window Heater
Date	2017-02-14 21:18 -0500
Organization	A noiseless patient Spider
Message-ID	<o80dmj$lua$1@dont-email.me> (permalink)
References	(6 earlier) <8d064474-a349-4b2d-8a9e-0eca5c881121@googlegroups.com> <7def2c9d-15b2-4e9c-a95c-310ce606757f@googlegroups.com> <1f4f12e8-214c-433b-bc9e-2873bae020d7@googlegroups.com> <4006ddae-a4a6-42ad-a5c8-4e2b97108432@googlegroups.com> <2b577fc6-93cb-4836-b9ab-1786154a83be@googlegroups.com>

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On 2/14/2017 8:42 PM, George Herold wrote:
> On Tuesday, February 14, 2017 at 7:28:58 PM UTC-5, dca...@krl.org wrote:
>> On Tuesday, February 14, 2017 at 4:20:49 PM UTC-5, dagmarg...@yahoo.com wrote:
>>
>>
>>>
>>> I'm not sure what you mean here by 'up' and 'down'--in this context of a
>>> refrigerator and a window, the surfaces are both vertical and the heat
>>> flow is horizontal, through the insulation
>>
>> I was commenting on heat flow in general.  Not just about the window case..
>> So if you are insulating an attic, in summer the heat flow is down and in the winter  the heat flow is up.  So in the summer the foil will help a lot and in the winter foil will have almost no effect.
>
> OK, I'm not sure in practice, but in theory I don'think it
> should matter much which side of the foil is hot or cold.
> It's an IR reflector, pretty much the same from both sides..
> (What's the peak wavelength/ frequency at ~300K)

It's not which side of the foil is hot or cold.  It has to do with the 
other mechanisms of heat transfer.  If the heat is rising, in theory it 
will contact the foil and convect/conduct the heat to the foil while a 
cold room won't do that so much.  I'm not sure the theory is sound as 
you get convection regardless of which way the "heat" is moving.  Its 
the same transfer mechanism.  But I have seen ratings of foil lined 
insulation and they do have different ratings for different uses and 
orientations.  The foil will work best if adjacent to a vacuum, but 
that's not practical other than in a thermos bottle.

The point is the foil prevents radiation emission and/or absorption.

-- 

Rick C

Thread

Window Heater rickman <gnuarm@gmail.com> - 2017-02-11 22:02 -0500
  Re: Window Heater bill.sloman@ieee.org - 2017-02-11 20:57 -0800
    Re: Window Heater rickman <gnuarm@gmail.com> - 2017-02-12 01:02 -0500
      Re: Window Heater whit3rd <whit3rd@gmail.com> - 2017-02-11 23:07 -0800
        Re: Window Heater rickman <gnuarm@gmail.com> - 2017-02-12 03:52 -0500
          Re: Window Heater whit3rd <whit3rd@gmail.com> - 2017-02-12 18:32 -0800
            Re: Window Heater rickman <gnuarm@gmail.com> - 2017-02-12 21:42 -0500
              Re: Window Heater "Tim Williams" <tiwill@seventransistorlabs.com> - 2017-02-13 10:04 -0600
                Re: Window Heater makolber@yahoo.com - 2017-02-13 10:17 -0800
                Re: Window Heater rickman <gnuarm@gmail.com> - 2017-02-13 15:30 -0500
                Re: Window Heater "Tim Williams" <tiwill@seventransistorlabs.com> - 2017-02-13 15:39 -0600
                Re: Window Heater rickman <gnuarm@gmail.com> - 2017-02-13 20:28 -0500
                Re: Window Heater krw@notreal.com - 2017-02-13 20:48 -0500
                Re: Window Heater Lasse Langwadt Christensen <langwadt@fonz.dk> - 2017-02-13 13:47 -0800
            Re: Window Heater dagmargoodboat@yahoo.com - 2017-02-14 06:56 -0800
              Re: Window Heater "dcaster@krl.org" <dcaster@krl.org> - 2017-02-14 07:17 -0800
                Re: Window Heater dagmargoodboat@yahoo.com - 2017-02-14 13:20 -0800
                Re: Window Heater George Herold <gherold@teachspin.com> - 2017-02-14 16:17 -0800
                Re: Window Heater "dcaster@krl.org" <dcaster@krl.org> - 2017-02-14 16:28 -0800
                Re: Window Heater George Herold <gherold@teachspin.com> - 2017-02-14 17:42 -0800
                Re: Window Heater rickman <gnuarm@gmail.com> - 2017-02-14 21:18 -0500
                Re: Window Heater dagmargoodboat@yahoo.com - 2017-02-14 19:20 -0800
                Re: Window Heater rickman <gnuarm@gmail.com> - 2017-02-14 22:42 -0500
                Re: Window Heater George Herold <gherold@teachspin.com> - 2017-02-15 06:51 -0800
                Re: Window Heater "dcaster@krl.org" <dcaster@krl.org> - 2017-02-15 06:06 -0800
                Re: Window Heater George Herold <gherold@teachspin.com> - 2017-02-15 06:54 -0800
                Re: Window Heater "dcaster@krl.org" <dcaster@krl.org> - 2017-02-15 09:15 -0800
                Re: Window Heater rickman <gnuarm@gmail.com> - 2017-02-15 15:02 -0500
                Re: Window Heater "dcaster@krl.org" <dcaster@krl.org> - 2017-02-15 16:38 -0800
                Re: Window Heater rickman <gnuarm@gmail.com> - 2017-02-15 19:50 -0500
                Re: Window Heater Martin Brown <|||newspam|||@nezumi.demon.co.uk> - 2017-02-17 11:18 +0000
                Re: Window Heater Martin Brown <|||newspam|||@nezumi.demon.co.uk> - 2017-02-16 08:28 +0000
              Re: Window Heater rickman <gnuarm@gmail.com> - 2017-02-14 14:07 -0500
                Re: Window Heater dagmargoodboat@yahoo.com - 2017-02-14 12:57 -0800
                Re: Window Heater rickman <gnuarm@gmail.com> - 2017-02-14 17:32 -0500
                Re: Window Heater dagmargoodboat@yahoo.com - 2017-02-14 19:12 -0800
              Re: Window Heater rickman <gnuarm@gmail.com> - 2017-02-14 14:16 -0500
                Re: Window Heater dagmargoodboat@yahoo.com - 2017-02-14 12:53 -0800
                Re: Window Heater John S <Sophi.2@invalid.org> - 2017-02-14 16:14 -0600
                Re: Window Heater rickman <gnuarm@gmail.com> - 2017-02-14 17:35 -0500
                Re: Window Heater John S <Sophi.2@invalid.org> - 2017-02-15 10:45 -0600
                Re: Window Heater rickman <gnuarm@gmail.com> - 2017-02-15 15:06 -0500
                Re: Window Heater rickman <gnuarm@gmail.com> - 2017-02-15 16:46 -0500
                Re: Window Heater rickman <gnuarm@gmail.com> - 2017-02-14 17:34 -0500
      Re: Window Heater bill.sloman@ieee.org - 2017-02-12 04:57 -0800
        Re: Window Heater rickman <gnuarm@gmail.com> - 2017-02-12 18:19 -0500
      Re: Window Heater Winfield Hill <hill@rowland.harvard.edu> - 2017-02-12 10:42 -0800
        Re: Window Heater rickman <gnuarm@gmail.com> - 2017-02-12 18:30 -0500
    Re: Window Heater Tom Gardner <spamjunk@blueyonder.co.uk> - 2017-02-12 08:45 +0000
      Re: Window Heater rickman <gnuarm@gmail.com> - 2017-02-12 03:57 -0500
        Re: Window Heater Tom Gardner <spamjunk@blueyonder.co.uk> - 2017-02-12 09:34 +0000
  Re: Window Heater Jon Elson <elson@pico-systems.com> - 2017-02-11 23:52 -0600
    Re: Window Heater rickman <gnuarm@gmail.com> - 2017-02-12 01:07 -0500
      Re: Window Heater Martin Brown <|||newspam|||@nezumi.demon.co.uk> - 2017-02-14 10:40 +0000
        Re: Window Heater rickman <gnuarm@gmail.com> - 2017-02-14 06:00 -0500
          Re: Window Heater John S <Sophi.2@invalid.org> - 2017-02-14 16:17 -0600
            Re: Window Heater Lasse Langwadt Christensen <langwadt@fonz.dk> - 2017-02-14 14:28 -0800
            Re: Window Heater rickman <gnuarm@gmail.com> - 2017-02-14 17:36 -0500
  Re: Window Heater Mikko OH2HVJ <mikko.syrjalahti@nospam.fi> - 2017-02-12 14:54 +0200
    Re: Window Heater Jim Thompson <To-Email-Use-The-Envelope-Icon@On-My-Web-Site.com> - 2017-02-12 08:56 -0700
      Re: Window Heater Tauno Voipio <tauno.voipio@notused.fi.invalid> - 2017-02-12 20:14 +0200
        Re: Window Heater Phil Hobbs <pcdhSpamMeSenseless@electrooptical.net> - 2017-02-11 00:30 -0500
    Re: Window Heater rickman <gnuarm@gmail.com> - 2017-02-12 18:56 -0500
  Re: Window Heater "dcaster@krl.org" <dcaster@krl.org> - 2017-02-12 06:35 -0800
    Re: Window Heater rickman <gnuarm@gmail.com> - 2017-02-12 19:01 -0500
      Re: Window Heater "dcaster@krl.org" <dcaster@krl.org> - 2017-02-12 17:29 -0800
        Re: Window Heater rickman <gnuarm@gmail.com> - 2017-02-12 21:37 -0500
          Re: Window Heater Jon Elson <jmelson@wustl.edu> - 2017-02-13 15:08 -0600
            Re: Window Heater Lasse Langwadt Christensen <langwadt@fonz.dk> - 2017-02-13 13:32 -0800
  Re: Window Heater Lasse Langwadt Christensen <langwadt@fonz.dk> - 2017-02-12 08:20 -0800
  Re: Window Heater "Tim Williams" <tiwill@seventransistorlabs.com> - 2017-02-12 11:48 -0600
    Re: Window Heater rickman <gnuarm@gmail.com> - 2017-02-12 19:03 -0500
      Re: Window Heater "Tim Williams" <tiwill@seventransistorlabs.com> - 2017-02-13 09:58 -0600
        Re: Window Heater rickman <gnuarm@gmail.com> - 2017-02-13 15:33 -0500
          Re: Window Heater Jon Elson <jmelson@wustl.edu> - 2017-02-13 15:10 -0600
            Re: Window Heater Lasse Langwadt Christensen <langwadt@fonz.dk> - 2017-02-13 13:36 -0800
            Re: Window Heater "Tim Williams" <tiwill@seventransistorlabs.com> - 2017-02-13 15:40 -0600
            Re: Window Heater rickman <gnuarm@gmail.com> - 2017-02-13 20:34 -0500
          Re: Window Heater krw@notreal.com - 2017-02-13 20:52 -0500
  Re: Window Heater Tim Wescott <seemywebsite@myfooter.really> - 2017-02-12 12:02 -0600
    Re: Window Heater rickman <gnuarm@gmail.com> - 2017-02-12 19:05 -0500
      Re: Window Heater Tim Wescott <seemywebsite@myfooter.really> - 2017-02-14 17:49 -0600
  Re: Window Heater bitrex <bitrex@de.lete.earthlink.net> - 2017-02-12 13:06 -0500
    Re: Window Heater rickman <gnuarm@gmail.com> - 2017-02-12 19:05 -0500
  Re: Window Heater Clifford Heath <no.spam@please.net> - 2017-02-13 11:21 +1100
  Re: Window Heater krw@notreal.com - 2017-02-12 19:28 -0500
  Re: Window Heater Martin Riddle <martin_ridd@verizon.net> - 2017-02-12 21:57 -0500
    Re: Window Heater "Tim Williams" <tiwill@seventransistorlabs.com> - 2017-02-13 10:01 -0600
  Re: Window Heater Lasse Langwadt Christensen <langwadt@fonz.dk> - 2017-02-13 13:49 -0800
    Re: Window Heater rickman <gnuarm@gmail.com> - 2017-02-13 20:36 -0500
  Re: Window Heater rickman <gnuarm@gmail.com> - 2017-03-01 19:44 -0500
    Re: Window Heater George Herold <gherold@teachspin.com> - 2017-03-01 17:33 -0800

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