[Stoves] Lanny Henson pot insulator

[Lanny Henson]

Crispin,
Drip tees were invented a long time ago to deal with condensation in metal 
chimneys.
The ell is replaced with a tee, the leg of the tee that points down is 
capped and holes are drilled in the cap. The holes lets condensation drip 
out and lets some dry air flow through the system. They used with wood 
heaters in the USA.
You would think that if you introduced outside air into the exhaust stream 
that you would just cause more condensation, but it works, somehow.
I have a YouTube video of how to build one. This is my first video so don't 
hold it against me!
http://www.youtube.com/watch?v=YbN5xhV8Auo
Lanny





> It has the very problem you anticipate in that its radiation efficiency is
> so high it collects water in the chimney elbow and because it is quite 
> hot,
> the elbow rusts away in 2 or 3 months if it is not stainless steel.

----- Original Message ----- 
From: "Crispin Pemberton-Pigott" <crispinpigott at gmail.com>
To: <frank at compostlab.com>; "'Discussion of biomass cooking stoves'" 
<stoves at listserv.repp.org>
Sent: Thursday, March 06, 2008 4:27 AM
Subject: Re: [Stoves] Lanny Hanson pot insulator


> Dear Frank
>
> You are quite right to ask that question about too much heat extraction.
>
> There is a Koran coal briquette stove available from Yontan or Yontang,
> something like that. I couldn't find the home website.
>
> It has the very problem you anticipate in that its radiation efficiency is
> so high it collects water in the chimney elbow and because it is quite 
> hot,
> the elbow rusts away in 2 or 3 months if it is not stainless steel.
>
> The gases should be rejected above 100 C if they can be, unless it is for 
> a
> brief time and you don't mind the mess.
>
> Regards
> Crispin
>
>
>
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