Two-Fiddy on the Barrel and a Hundred Less on the Stack

 
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Pancho
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Post by Pancho » Fri. Oct. 24, 2014 4:27 pm

coalnewbie wrote:Explain banking 2/3rds a bucket. I would prefer in your No 8s for idiots guide you make a movie of these mistakes in real time. Now that would be exciting, put it on Youtube..... Ashcat, what are you doing these days?

I had about 2/3rds of a bucket of coal sitting there. I didn't need to add it but had room in the pot and time to play....so I dumped it in keeping an area in the back of the burn pot exposed to hot coal. Usually when I add coal, I add at least a full bucket....and with this being nut size, it usually takes 20 minutes or so to get the blue ladies dancin'. Well, I went away with my internal alarm clock set for 20 minutes ish and when I glanced over at about the 10 minute mark, I had a doozer of a fire going.

I pushed the banked coal around to make it all flat, cut the primaries, closed the secondaries, shut the MPD and threw it into indirect mode and cleaned out my skivvies.

It's bad enough that my errors in print will be 'out there' as long as the internet exists.....aint no way I'm doin' movies.
Plus, being a family board, I don't know how all the cussin' would go over. :)

 
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Post by ddahlgren » Fri. Oct. 24, 2014 4:33 pm

When you put a flat magnetic thermometer on a round pipe that room air can cool you learn nothing just give it up. I am willing with a accurate probe you will know a good deal more. Skin temps important on the stove to describe heat delivery and internal net stack temps describe efficiency.

 
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Post by coalnewbie » Fri. Oct. 24, 2014 4:42 pm

Yes I am a space cadet and forget everything so I always set my Ebay alarm for 10 minutes and put it around my neck. Saved my a$$ many times

 
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Pancho
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Post by Pancho » Fri. Oct. 24, 2014 5:02 pm

ddahlgren wrote:When you put a flat magnetic thermometer on a round pipe that room air can cool you learn nothing just give it up. I am willing with a accurate probe you will know a good deal more. Skin temps important on the stove to describe heat delivery and internal net stack temps describe efficiency.
It tells me all I need to know. Is it accurate?...somewhat. Would a probe be more accurate?. Probably.
I just use them as a reference point. For that, they work just fine.


 
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Post by franco b » Fri. Oct. 24, 2014 10:21 pm

ddahlgren wrote: By: ddahlgren On: Fri Oct 24, 2014 4:33 pm

When you put a flat magnetic thermometer on a round pipe that room air can cool you learn nothing just give it up. I am willing with a accurate probe you will know a good deal more. Skin temps important on the stove to describe heat delivery and internal net stack temps describe efficiency.
That's correct except the part about giving it up. Since the use of these is just about universal in the forum it's the only way to form relative judgments. It beats holding your hand on the hot part or spitting on it to judge the sizzle.

Nothing in life is an absolute, everything is relative to something else.

 
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Post by Vangellis » Fri. Oct. 24, 2014 11:40 pm

Pancho wrote:
ddahlgren wrote:When you put a flat magnetic thermometer on a round pipe that room air can cool you learn nothing just give it up. I am willing with a accurate probe you will know a good deal more. Skin temps important on the stove to describe heat delivery and internal net stack temps describe efficiency.
It tells me all I need to know. Is it accurate?...somewhat. Would a probe be more accurate?. Probably.
I just use them as a reference point. For that, they work just fine.
Bingo. Well said.

Kevin

 
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Post by ddahlgren » Sat. Oct. 25, 2014 4:31 am

It is when ratios are mentioned between barrel temp vs. stack temp it becomes a fantasy. My magnetic thermometer reads currently 250 and the probe 500 the stove top 550 and climbing. should top out at 600 or so. off by 50% is not a slight error in my mind.. It is probably 60% efficient at turning red oak into heat maybe a touch better if the heat off the single wall stack figured in while not coal until after this weekend it is about the norm for a box type wood burner with 3 year seasoned oak. can't wait to put the black rocks to work for me then the real questions will begin.

 
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Post by Pancho » Sat. Oct. 25, 2014 10:18 am

ddahlgren wrote:It is when ratios are mentioned between barrel temp vs. stack temp it becomes a fantasy. My magnetic thermometer reads currently 250 and the probe 500 the stove top 550 and climbing. should top out at 600 or so. off by 50% is not a slight error in my mind.. It is probably 60% efficient at turning red oak into heat maybe a touch better if the heat off the single wall stack figured in while not coal until after this weekend it is about the norm for a box type wood burner with 3 year seasoned oak. can't wait to put the black rocks to work for me then the real questions will begin.
But I don't care about accuracy or error.

If my thermo says 350 on the barrel and 100 on the stack and I know for my settings this is where it typically should be (given outside temps and wind strenght/direction)..........I don't care if it's actually 600 via probe inside the barrel. I already have my datum point for the heat ouptput I am looking to achieve.

However far off the mag thermo reads from what a probe would read would still be proportional. That's all the info I need.


 
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Post by Pancho » Sat. Oct. 25, 2014 8:52 pm

I sorda let it go out. It's nice and warm here for the next couple days. Looks by mid next week (for sure next weekend), high temps will drift towards the 40's and I'll be able finally be able to open the throttle a wee bit.

Time to clean it up, vacuum out the gas ring and the innerds....mayhaps throw a coat of stove polish on and get ready for the start of the season.

 
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Post by franco b » Sat. Oct. 25, 2014 9:58 pm

ddahlgren wrote:My magnetic thermometer reads currently 250 and the probe 500 the stove top 550 and climbing. should top out at 600 or so.
I suspect your thermometer is off by more than usual. Past posts where one has been compared to another the difference is usually 100 degrees hotter with the probe. Trying another magnetic thermometer may be a lot closer.

 
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Post by KingCoal » Sun. Oct. 26, 2014 7:37 am

while was using the mag. therms. last yr. I thought they were good enough. heck I never even had any type of gauges for 24 yrs. :lol: and I still got it to burn and didn't die.

any way this yr. when Harbor Freight put those little cen-tech infra red therms. on sale for $25.00 I bought one.

now I haven't checked the I.R.T. with any thing else but it reads a good bit diff. than the mag.s did. I suspect the open air design of the mags. compared to the direct surface temp. with the I.R. T.

 
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Post by titleist1 » Sun. Oct. 26, 2014 8:47 am

KingCoal wrote:now I haven't checked the I.R.T. with any thing else but it reads a good bit diff. than the mag.s did. I suspect the open air design of the mags. compared to the direct surface temp. with the I.R. T.
I did the same thing last year and picked up an IR unit when it was on sale too. I have a probe in my flue pipe and a magnetic on the stoker. I was surprised how close the IR was to both, but especially the probe.

I think it was within 10* of the probe but can't remember for sure, there is a post with comparison pics on here somewhere. I thought the skin temp of the flue pipe would have been much different than the internal gas but it wasn't.

The magnetic was about 50* less than the IR although how far off is tough to tell because that magnetic gauge doesn't have too much 'granularity' to it.

I am like pancho in that I know what readings on those two gauges is normal for different firing conditions and that is what I pay attention to. I need my gauges to be 'repeatable' rather than 'accurate'. If I see a different number then I look for a reason.

 
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Post by Pancho » Sun. Oct. 26, 2014 10:16 am

titleist1 wrote:
KingCoal wrote:now I haven't checked the I.R.T. with any thing else but it reads a good bit diff. than the mag.s did. I suspect the open air design of the mags. compared to the direct surface temp. with the I.R. T.
I did the same thing last year and picked up an IR unit when it was on sale too. I have a probe in my flue pipe and a magnetic on the stoker. I was surprised how close the IR was to both, but especially the probe.

I think it was within 10* of the probe but can't remember for sure, there is a post with comparison pics on here somewhere. I thought the skin temp of the flue pipe would have been much different than the internal gas but it wasn't.

The magnetic was about 50* less than the IR although how far off is tough to tell because that magnetic gauge doesn't have too much 'granularity' to it.

I am like pancho in that I know what readings on those two gauges is normal for different firing conditions and that is what I pay attention to. I need my gauges to be 'repeatable' rather than 'accurate'. If I see a different number then I look for a reason.
Worded much better than I did.

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