[Stoves] Thermal efficiency

[Frank Shields]

Dean,

 

When you do CCT with real cooks are you also using real on-site fuel? Then
you take your equipment to another location and use different fuel, cooks
and different tasks making decisions site-specific as to the best stove for
the location. Is the reporting something like the 6 Box systems I was trying
to put together with each step now being described rather than controlled?
Has this move from lab testing to field testing made the lab obsolete and
there are no more shovels of flaming hot wood and char to weigh? 

 

 

 

Thanks

 

Frank

 

Frank Shields

Control Laboratories; Inc.

42 Hangar Way

Watsonville, CA  95076

(831) 724-5422 tel

(831) 724-3188 fax

frank at biocharlab.com

www.controllabs.com

 

 

 

 

 

From: Stoves [mailto:stoves-bounces at lists.bioenergylists.org] On Behalf Of
Dean Still
Sent: Monday, October 14, 2013 12:09 PM
To: Discussion of biomass cooking stoves
Subject: Re: [Stoves] Thermal efficiency

 

Hi Frank,

 

We test stoves several times a day here at the lab usually following an
iterative design process to improve performance and decrease emissions of CO
and PM. As far as I can tell, boiling and simmering water and tracking fuel
use and emissions works OK but the real measure is using the CCT with real
cooks, making their favorite food under the emission hood. Then we're a lot
closer to seeing actual performance compared to the traditional stove. The
CCT gets the lab into the field and the field into the lab which gets us
closer to predictive data.

 

Best,

 

Dean

 

On Mon, Oct 14, 2013 at 9:38 AM, Frank Shields <frank at compostlab.com> wrote:

Hi Dean,

 

Anything as close to real world I am in favor of. So I agree about using the
water boiling test as-is. 

 

But I do like the design of the method Alex described that included all the
necessary checks that make for a good, repeatable test. Well designed. I may
use it here for measuring heat increase in cubic meter size, self-heating
compost bins with compost-char experiments. Thinking a coil of water filled
tubing would work better getting a more representative reading than a
thermometer stuck in the center.   

 

And maybe someday I will actually get to test some stoves.

 

Regards

 

Frank

 

 

Frank Shields

Control Laboratories; Inc.

42 Hangar Way

Watsonville, CA  95076

(831) 724-5422 <tel:%28831%29%20724-5422>  tel

(831) 724-3188 <tel:%28831%29%20724-3188>  fax

frank at biocharlab.com

www.controllabs.com

  

 

From: Stoves [mailto:stoves-bounces at lists.bioenergylists.org] On Behalf Of
Dean Still
Sent: Sunday, October 13, 2013 3:38 PM
To: Discussion of biomass cooking stoves
Subject: Re: [Stoves] Thermal efficiency

 

Hi Frank and Alex,

 

Boiling 2.5 or 5 liters of water in a pot shows if the stove is capable of
doing one of the tasks which are often needed for cooking food. It's
important information. Boiling and simmering are both frequently needed when
cooking. The WBT published by VITA was patterned after actual cooking tasks
for good reasons.

 

Best,

 

Dean

 

 

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