[Stoves] radiant heat capture, total heat measurement

[Paul Olivier]

See comments.

On Wed, Mar 14, 2012 at 1:54 PM, Andrew C. Parker <acparker at xmission.com>wrote:

> Are you measuring the temperature of the gas or the radiant temperature or
> both?


I am supposed to be measuring both.
The temperature with the dome normally should not be be less than without
the dome.
This, though, is what's happening.
This means, perhaps, that the probe is not absorbing thermal radiation very
well.


> The gas temperature should go down with the dome and the radiant energy
> should go up.


It makes perfect sense that the gas temperature should go down.
I think that my probe, though, is not picking up the thermal radiation very
well when the dome is present.
But, then, without the dome, the probe turns red hot.
With the dome, it does not.


> In reading the patents I posted earlier, the point appears to be to
> convert as much heat into IR as possible.  Infraconic purports to convert
> 70% or more, which seems a reasonable goal, since the heaters are pointed
> down.
>

I like very much the funnel that surrounds the infraconic heater.
http://www.infraconic.com/
What is the funnel made from?

>
> If you want to measure the total radiant heat from the dome, it might be
> more complex than a single temperature probe.
>
> Both commercial heater patents burn the gas in/on the porous layer.  Both
> use diffuser(s)/flame suppressor(s) before the combustion layer.  I think
> that the gas diffusers in both designs also serve to reflect radiant energy
> back to the combustion layer.  The Infraconic adds an amplifying layer
> after the combustion layer.
>
> Have you tried using the mesh dome as your primary gas burner (be careful
> of backfires)?
>

Yes, if I turn the gas very low, I only get combustion of the gas in the
apex of the dome.
No backfires occur.


>
> The two chimney designs convert heat from a primary heat source and
> convert it into IR or visible light.  There may be some secondary
> combustion in/on the porous layer.
>
> For Rocket stovers, the first thing that came to mind when I read the
> Infraconic patents and, more particularly after reading the chimney patent,
> was Aprovecho's study on controlling chimney draft.
>
>
> Andrew Parker (Not AJH, so feel free to take my comments with a sack of
> salt.)
>
>
>
>
>
> On Tue, 13 Mar 2012 22:38:02 -0600, Paul Olivier <paul.olivier at esrla.com>
> wrote:
>
>
>  Alex,
>>
>> I took three sets of temperature readings with and without the dome.
>>
>>                  With     Without
>> Reading 1 -  500 C    563 C
>> Reading 2  - 473 C    578 C
>> Reading 3 -  470 C    571 C
>>
>> All measurements were taken at the same height above the burner.
>> With the dome, the probe remained its normal color.
>> Without the dome, the probe got red hot.
>>
>> The burner that I am using is a Belonio burner.
>> In a first step I added a burner housing to the Belonio burner.
>> In a second step I added the dome.
>> I can't imagine that the burner housing alone accounts
>>  for the much better boiling time that I get in comparison to Belonio.
>> I am totally at loss in explaining these temperature readings.
>>
>> Paul
>>
>
> ______________________________**_________________
> Stoves mailing list
>
> to Send a Message to the list, use the email address
> stoves at lists.bioenergylists.**org <stoves at lists.bioenergylists.org>
>
> to UNSUBSCRIBE or Change your List Settings use the web page
> http://lists.bioenergylists.**org/mailman/listinfo/stoves_**
> lists.bioenergylists.org<http://lists.bioenergylists.org/mailman/listinfo/stoves_lists.bioenergylists.org>
>
> for more Biomass Cooking Stoves,  News and Information see our web site:
> http://www.bioenergylists.org/
>
>


-- 
Paul A. Olivier PhD
27C Pham Hong Thai Street
Dalat
Vietnam

Louisiana telephone: 1-337-447-4124 (rings Vietnam)
Mobile: 090-694-1573 (in Vietnam)
Skype address: Xpolivier
http://www.esrla.com/
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.bioenergylists.org/pipermail/stoves_lists.bioenergylists.org/attachments/20120314/2454dfd1/attachment.html>