[Stoves] flames touching pot

[Frank Shields]

Dear Crispin,

 

I'm using pipes to char samples for testing.  The furnace the pipes are in
is temperature controlled. I want to check the temperature to make sure the
furnace temp reading is accurate to the temperature of the pipe.

I like the fact the IR detector also has a probe. I am thinking I can 'read'
the outside of the pipe using IR and have a blank pipe with a larger hole in
one end to insert the K-probe to get a reading inside the pipe. 

 

In this case the heat is outside and inside the pipe (in the furnace) so
does emissivity come in to play? There should be no lost of heat at the
surface as I see it. Should I set it at 1 to get the real temperature?

 

Why is something so simple always become so complicated. : )

 

I have more questions but will read your email again to see if it answers
it. I am using a 'black' steel pipe that has an e of ~0.23. How would I set
the IR meter to read the temperature of the pipe surface while it is in the
furnace (open door and read quickly)? 

 

 

Thanks

Frank

 

 . 

 

 

 

 

 

 

 

Frank Shields

Control Laboratories, Inc.

42 Hangar Way

Watsonville, CA  95076

(831) 724-5422 tel

(831) 724-3188 fax

frank at compostlab.com

www.compostlab.com

 

 

  _____  

From: stoves-bounces at lists.bioenergylists.org
[mailto:stoves-bounces at lists.bioenergylists.org] On Behalf Of Crispin
Pemberton-Pigott
Sent: Thursday, September 15, 2011 1:52 PM
To: 'Discussion of biomass cooking stoves'
Subject: Re: [Stoves] flames touching pot

 

Dear Frank

 

There is a marvellous product available from ThermoWorks. It was not very
expensive compared with earlier technologies. We have two of these in
Ulaanbaatar.

http://www.thermoworks.com/products/ir/irpro.html

 

It comes in that very nice box on the right.

 

Because it was quite new I had to have them shipped to my regular supplier
E&E Process and take them to UB.

 

Make sure to get a K-band thermocouple to go with it that is long enough to
get into places the supplied one can't reach. It is not wrong to have a 5
foot long one 8mm in diameter. They are not very expensive.

 

Note that the emissivity can be set from 0.1 to 1.0 - an amazing range. This
is a new generation machine. $225!

 

Regards

Crispin

 

 

 

++++++++

 

Dear Crispin,

 

 

I'm surprised the paint color on the outside would make much difference. 

Lets see if I have this right. As the goal is to keep the heat inside the
stove body we want less radiation to the outside off the paint. So more heat
on the outside surface the more loss from the inside stove unless the loss
is greater than the heat being supplied from the stove (not likely(?)). So
its not the thickness of the paint and insulating material of the paint but
the color of the surface that makes a big difference(?) as to how fast the
heat will radiate to the outside air(?). 

 

And thanks for the info on purchase of an IR thermometer having an
emissivity setting as I am about to purchase one. Any suggestions?

 

Again - lots of great information. 

 

Thanks

Frank

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