Moving Baro Damper

Moving Baro Damper

PostBy: coalloser On: Fri Jan 02, 2009 1:41 pm

As you can see, I have taken the advise of fellow coal burning brothern and moved the baro damper tee up on my pipe configeration (Pic 1 is where it was and Pic 2 is where I have it now). At it's new loaction, the pipe temp is averaging around 300 degrees. Big change from previous position when it temp around 400. I am thinking about moving it to attach the 90 degree elbow coming out of the inser. Before I do this, I was wondering what the pro's and con's would be? Keep in mind, I have about a 30 ft chimney that sucks like a vaccume.
Attachments
Pic 1.JPG
(1.25 MiB) Viewed 18 times
View: New PagePopup • Select:BBCode
[nepathumb]9786[/nepathumb]
Pic 2.JPG
(747.18 KiB) Viewed 18 times
View: New PagePopup • Select:BBCode
[nepathumb]9787[/nepathumb]
coalloser
 
Stove/Furnace Make: Stratford

Re: Moving Baro Damper

PostBy: WNY On: Fri Jan 02, 2009 2:24 pm

First, Why did you move it?

You also switched how you are measuring the temp, It will be 50-100 degrees cooler AFTER the baro, since it is taking in room air and cooling the exhaust. Move your temp gauge down below the baro, closer to the stove, and I bet you will get the same readings you had before.

It shouldn't matter where you have it placed, the temps and how it works should be the same.

It will do the same thing, the closer the stove, however, you could get more fly ash build up in the section.

It should work fine anywhere in the vertical section you have it.
WNY
 
Hot Air Coal Stoker Stove: Keystoker 90K, Leisure Line Hyfire I
Coal Size/Type: Rice
Stove/Furnace Make: Keystoker, LL & CoalTrol
Stove/Furnace Model: 90K, Hyfire I, VF3000 Soon

Re: Moving Baro Damper

PostBy: CapeCoaler On: Fri Jan 02, 2009 2:38 pm

A more stable air stream 18" after the 90* turn.
CapeCoaler
 
Stoker Coal Boiler: want AA130
Hand Fed Coal Stove: DS Machine BS#4, Harman MKII, Hitzer 503,...
Coal Size/Type: Pea/Nut/Stove

Visit Hitzer Stoves

Re: Moving Baro Damper

PostBy: WNY On: Fri Jan 02, 2009 3:01 pm

You are correct. You should have a good straight section before and after the baro for optimum operation.
Not sure why he moved it closer to the stove, it was fine where it was....?? :?:
WNY
 
Hot Air Coal Stoker Stove: Keystoker 90K, Leisure Line Hyfire I
Coal Size/Type: Rice
Stove/Furnace Make: Keystoker, LL & CoalTrol
Stove/Furnace Model: 90K, Hyfire I, VF3000 Soon

Re: Moving Baro Damper

PostBy: titleist1 On: Fri Jan 02, 2009 3:32 pm

I have my baro where your 90* feeds into your thimble. It makes it easy for me to vacuum out the fly ash that accumulates in that horizontal section of flue pipe.

I think that if you do place it in a similar position you should use a manometer to set the baro weight for the proper draft. I don't think you can depend on the horizontal or vertical scale on the baro without the manometer since it is not a recommended location.

My stack temp measured with the magnetic thermometer in the pic usually stays in the 200* F range. I don't know what it is above the baro, (I'll have to move the thermometer to see) but I can tap my hand on the pipe for a couple seconds without burning myself.
Attachments
DSC09487.JPG
(60.42 KiB) Viewed 14 times
View: New PagePopup • Select:BBCode
[nepathumb]9790[/nepathumb]
titleist1
 
Hot Air Coal Stoker Stove: Harman Mag Stoker (old style) one in basement, one in workshop
Hand Fed Coal Stove: Harman Mark III on standby for long power outages
Coal Size/Type: Rice/Anthracite; Nut/Anthracite

Re: Moving Baro Damper

PostBy: titleist1 On: Mon Jan 05, 2009 12:55 pm

Just to get some comparison temps I moved my thermometer above the baro just before the thimble a couple times over the weekend and I noticed a small change in temp. It measured only about 40* less above the baro (about 160*) than below (about 200*). I suspect that because of the location of the baro port I am pulling in warmer air from above the stove which lessens the cooling effect of pulling room air. The flue pipe is angled from the stove to the thimble so the baro is about 8" to the side of the stove, but as you can see from the previous pic, the port for the baro is straight on toward the thimble so I can clean out that pipe more easily. It might pull slightly cooler air if I had it facing toward the right, away from the stove, resulting in a larger temp difference.

The manometer steadily measures between .045 - .05 so there is very little variation in the draft being pulled through the bed of coals as the baro flutters and the below baro temp stays at a steady 200*, maybe dropping to 180* for a short time after loading. The cat-o-mometer's don't seem to notice this slight decrease in temp while in their comatose state in front of the stove - although they do seem to resent the daily disturbances as I load up the stove and empty the ash pan. :roll:


Possible entries for our knowledge base...feel free to embellish!

Manometer - a non-living mechanical device that is mounted on the wall in a level position and measures draft pressure
Thermometer - a non-living and mechanical device that is magnetically mounted or inserted and measures temperature on or in the flue pipe
Cat-o-mometer - a living organism that embeds itself and becomes a nearly immovable object in front of the stove for months at a time when outdoor temps drop below 35* . The cat-o-mometer measures room comfort temperature. Checking for a pulse throughout the winter months is a good idea, since a death on their part could be mistaken for their normally comatose behavior.
titleist1
 
Hot Air Coal Stoker Stove: Harman Mag Stoker (old style) one in basement, one in workshop
Hand Fed Coal Stove: Harman Mark III on standby for long power outages
Coal Size/Type: Rice/Anthracite; Nut/Anthracite

Re: Moving Baro Damper

PostBy: Paperboy On: Mon Jan 05, 2009 7:15 pm

coalloser wrote: (Pic 1 is where it was and Pic 2 is where I have it now).

I think you mis-interpreted his pictures, WNY. He did move it up higher in the stack.

titleist1 wrote:I think that if you do place it in a similar position you should use a manometer to set the baro weight for the proper draft. I don't think you can depend on the horizontal or vertical scale on the baro without the manometer since it is not a recommended location.


I have mine in a tee, similar to titleist1. According to the information from Fields, which came with it, the tee is an acceptable location. Mine seems to work well like that, and as you mentioned, it's easy to see if there's fly ash accumulation in the horizontal pipe.
Paperboy
 
Hand Fed Coal Stove: Alaska Kodiak; Atlanta Homesteader
Stove/Furnace Make: Alaska; Atlanta
Stove/Furnace Model: Kodiak; Homesteader

Visit Hitzer Stoves