Paul, Andrew
Mixing gases of similar densities requires energy whether it is for primary
or secondary air. To conserve energy some designs concentrate small jets of
combustion air impinging on small areas of fuel. Good secondary air mixing
is also done with jets as Tom demonstrates in the burner "ring" of his
turbostove. (See photo at
http://crest.org/discussiongroups/resources/stoves/ ) We sometimes use
eductor or venturi designs for mixing. These also require energy to
penetrate and mix with combustible gases. It seems to me that the challenge
is to "blow on the fire" without using a bellows (external energy). To do
that you have to have a pressure differential or a temperature differential.
Tom Miles
----- Original Message -----
From: "Paul S. Anderson" <psanders@ilstu.edu>
To: "AJH" <andrew.heggie@dtn.ntl.com>; <stoves@crest.org>
Sent: Thursday, May 23, 2002 6:50 AM
Subject: Temperature dilution
> Has research been done on the impact of pre-heated primary and/or
> pre-heated secondary air? Anyone have references?
>
> Tom Reed was just here in Illinois, so he is on the road and will not get
> this message for several days. While here he said that the denser
(cooler)
> air was better able to force its way into a body of gases than would
warmer
> air, meaning better mixing of air and gas if the air was cooler. I said
to
> Tom that I believe in the value of pre-heated air and therefore we need to
> consider how to do better mixing. (Then he left, and the conversation
> remains open.)
>
> I would think this is pretty basic information that merits data collection
> if data are not already available.
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