Re: [ATM] ATM Digest, Vol 50, Issue 21

["Arjan te Marvelde" <Arjan.te.Marvelde@hetnet.nl>]

Robert,

One more thing: If I fill in anything other than 0 for back side emissivity, 
this will influence cooling considerably.I suspect that for this side you 
also took 200K as remote temperature. Realistically this should be more like 
270-290K range, and hence radiation loss is closer to 0, or even negative.
Normally backside bare glass emissivity will be much higher than the 0.04 
for the Al coated frontside. Would it be an idea to be able to add a 
parameter to control the effective remote temperature, both front and back?

   Arjan

> For the sky effective temperature I've used your 200 K value.
> The user can adapt to different situations by changing the emissivity
> values for the front and back surfaces. For a mirror in a telescope tube
> a value of 0.01 or even lower could be used. I'll add this comment to
> the web page.

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