[Stoves] moving warm air

Sun Jun 17 17:36:56 CDT 2012

Dear John,

The idea to take the hot air directly away by a duct seems to be a way,
especally when I guess there is a lot of hot air, instead of radiation and
big mass.
But in the moment I remind Crispin's work in Ulanbataar. He made the burning
chamber of a coal-stove smaller by putting/masoning some bricks into the
burning chamber. That seems me a simple method to reduce the heat output of
your stove, without changing too much the gas-speed in the burning chamber.

For experiment, you could test only with putting some bricks or parts of
bricks into the burning chamber so that the burning chamber gets a lot
smaller.
I think Crispin can tell you a lot more about that, and how to do.

Interested to hear further about the story.

Kind Regards
Martin

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Betreff: Stoves Digest, Vol 22, Issue 22

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Today's Topics:

   1. Re: moving warm air (John Davies)

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Message: 1
Date: Sun, 17 Jun 2012 16:35:47 +0200
From: "John Davies" <jmdavies at telkomsa.net>
To: "'Discussion of biomass cooking stoves'"
	<stoves at lists.bioenergylists.org>
Subject: Re: [Stoves] moving warm air
Message-ID: <000001cd4c96$7d094fa0$771beee0$@telkomsa.net>
Content-Type: text/plain; charset="us-ascii"

Dear Martin,

The stove is a Beckers 385, with 11Kw output, for 340m3 heating area. It has
2 air heating ducts, which heat air with the flue gas before entering the
chimney.

The problem is that it is in a room of 77M3 with a standard doorway leading
into a passage way. A fair amount of warm air circulates to the rest of the
house, but not enough to prevent hot air concentrating in the room.

Itried blowing cold air into the room at ground level, with a standard room
fan. This made the room more comfortable, and forced warm  air into the
passage way. This is not practical, and the fan mentioned uses a fair amount
of power.

I think that the way to go is to use a fan in a duct which sucks in the hot
air leaving the stove.

Thanking you,

John Davies.

It 

From: stoves-bounces at lists.bioenergylists.org
[mailto:stoves-bounces at lists.bioenergylists.org] On Behalf Of Boll, Martin
Dr.
Sent: 15 June 2012 10:33 PM
To: stoves at lists.bioenergylists.org
Subject: Re: [Stoves] moving warm air

Dear John,

Your problem with too much heat in the room of the stove will be more
complex. I guess you will not solve the problem by only moving some hot air
to another room. 

I guess by my experience with a big stove, that a good amount of the heat
will be released by your stove in form of radiation. If it is like this, I
guess you have to shield the surrounding of the stove a lot from the
radiation of the stove, that you will not feel so uncomfortable hot (as in
the summer-sun) and to use the radiation to warm up a medium (air or some
liquid or fast material absorbing the heat) and bring the radiated energy in
that (captured) form into another room. 

Example: some oil-filled radiators, which are electrically heated and can be
moved to another space when warmed up, to warm another room, when brought
there.

I guess it was worth a test, to concentrate the spread radiation onto a tube
by a Rinnenkollektor ( I don't know the English expression: e.g a
Rinnenkollektor could consist of a half-pipe reflector with tube in its
focus-line)

-you could test, it with a plastic dirty-water-tube cut into a 1/3 tube and
lined with aluminium-foil, which concentrates the radiation onto a blacked
copper-tube. In this copper-tube you could measure the temperature, to know
if the temperature was useful for the other room.

The simpler way was, to hang close to the stove some bags filled with
material that could absorb heat, and to remove them after being heated, to
cool down in the neighbour-room.

In that time of heating the bags you could feel, if the felt temperature in
the room with the stove was agreeable. - My idea: Hang up some wet towels
for a short time, to shield against the radiation. So you can feel (for a
short time) immediately, if the radiation makes the feeling of too much heat
or if it was the too high temperature of the air.

I know your problem, because I have a 14.5 kW high-mass stove which is
heating a 120 m3 room. It feels feels to hot in the room, if the stove is
really good fed, and gives much heat by its big surface. (5 m2) 

I thought about transporting hot air to a neighbour room to solve the
problem, but I am nearly sure, it will not solve the problem, because the
stove has a very big surface which radiates. If you would be interested, I
could give you the address of the factory in Germany, to give you an
impression of my stove to compare with yours.

Happy to have now summer-time in Germany-; but the temperatures are actually
so low, that we use a little bit the space-heating-stove.

Interested how you think about and deal with that problem.

Have a comfortable feeling by your stove.

Martin 

>Message: 3

>Date: Fri, 8 Jun 2012 20:14:44 +0200

>From: "John Davies" <jmdavies at telkomsa.net>

>To: "Discussion of biomass cooking stoves"

>     <stoves at lists.bioenergylists.org>

>Subject: [Stoves] moving warm air

>Message-ID: <000301cd45a2$95eba7c0$c1c2f740$@telkomsa.net>

>Content-Type: text/plain; charset="us-ascii"

> 

>I have recently moved house, and have a dilemma. I have an anthracite
heater in one room which is uncomfortably warm. I wish to >move the warm air
into adjacent rooms to have a more even heating of the house. There is an
open doorway leading into a >passageway, but the air movement is
insufficient.

> 

> 

>My thoughts are to bore holes through the walls the size of a computer fan
and mount such fans in the holes to distribute the warm >air.

> 

> 

>Would this be successful ?  What wattage fan would move how much air ?  Is
the idea viable?

> 

> 

>Your thoughts would be welcome.

>John Davies,

> 

>Experiencing the first winter chill.

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