[Stoves] radiant heat capture, total heat measurement

[Kevin]

Dear Crispin

I did another experiment a follows:

Basically, I had a piece of heavy wool cloth as a "background." I "shot the 
mirror" at various angles, with the wool cloth intercepting the "red dot" 
after it bounced off the mirror.

1: A direct temperature reading of the wool cloth was 62 F
2: Very Shallow angular reflection of the mirror and onto the cloth gave 62 
F also.
3: When I "shot directly" at the mirror, with the face of the instrument 
directly on the mirror, I read 57 F.
4|: As I increased the angle of the beam, the observed temperature fell 
relatively uniformly from 62 to 57.  (Eg, at 40 to 50 degree angle, the 
indicated temperature was about  51 to 50 F

Best wishes,

Kevin

----- Original Message ----- 
From: "Crispin Pemberton-Pigott" <crispinpigott at gmail.com>
To: "Discussion of biomass cooking stoves" <stoves at lists.bioenergylists.org>
Sent: Thursday, March 08, 2012 11:35 PM
Subject: Re: [Stoves] radiant heat capture, total heat measurement


> Dear Kevin
>
> I have enjoyed your experiments. I was wondering I you could get a 
> different temperature from the mirror by trying to receive different 
> incident angles. At some point there will be a very effective reflection 
> off the surface of the glass, not the mirrored surface behind it.
>
> Because glass is a pretty good absorber of IR it is also a pretty good 
> emitter.
>
> One thing for sure, when testing a new surface you should calibrate the 
> emissivity using a contact thermocouple - often provided with the unit if 
> the emissivity is adjustable. Frank has that sort.
>
> Regards
> Crispin
>
> PS anyone see the CME impact in N America?
> -----Original Message-----
> From: "Kevin" <kchisholm at ca.inter.net>
> Sender: stoves-bounces at lists.bioenergylists.org
> Date: Thu, 8 Mar 2012 22:23:06
> To: <mredmond3 at gatech.edu>; Discussion of biomass cooking 
> stoves<stoves at lists.bioenergylists.org>
> Reply-To: Discussion of biomass cooking stoves
> <stoves at lists.bioenergylists.org>
> Subject: Re: [Stoves] radiant heat capture, total heat measurement
>
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