temperature rise

Scott Stone

Scott Stone

New member
This is a purely theoretical question. In a perfect world, how many btu's does it take to heat 6 gallons of water with a 200 degree temperature rise above ambient temperature? On a side note, why are most pressure heaters rated at 500,000 btu's? Finally, and this is the most serious question of all, what can a contractor do to raise the efficiency of his heating system?
 
Scott Stone said:
This is a purely theoretical question. In a perfect world, how many btu's does it take to heat 6 gallons of water with a 200 degree temperature rise above ambient temperature?
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So what's the ambient temperture?
 
Scott Stone said:
This is a purely theoretical question. In a perfect world, how many btu's does it take to heat 6 gallons of water with a 200 degree temperature rise above ambient temperature? On a side note, why are most pressure heaters rated at 500,000 btu's? Finally, and this is the most serious question of all, what can a contractor do to raise the efficiency of his heating system?
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Scott, you know there's only one man in the world who's qualified to answer that question and he's not here. Why are you teasing us? :big_boss:
 
BTU = heat to raise one pound water 1 degree F...

Greater surface area exposed to heat - longer coil, smaller diameter pipe with multiple passes...

Maximum fuel burning efficiency

hydrogen injection

more insulation

waste heat scavenging
 
So what is the number?
How do we apply this to a pressure washer? Smaller diameter pipe means reduced flow.
I am thinking a longer coil, multiple passes and a radiator system to absorb more heat might work, but be expensive.
 
Tony Shelton said:
Scott, you know there's only one man in the world who's qualified to answer that question and he's not here. Why are you teasing us? :big_boss:
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scott .......tony's right their is only one person that can explain it ....come on

do the right thing.... ask him you'll feel better...better yet call him....







































I'm sure Nigel knows the answer....
 
LOL! I would because i like Nigel. I just have a hard time understanding him. I think it is too many years pressure washing has effected my hearing.
 
Yep Nigel would be the one........

On a side note i got caught in a Blizzard yesterday :yikes::yikes: Hit me by surprise....
 
1 gal =8.345 lbs
6 gal = 50 lbs
50 x 200 = 10000 BTU
 
Smaller pipe has more surface area to volume. Multi pass could maintain the flow
s-coil1.jpg
 
So why do we have heaters that are so inefficient that they capture less than 2% of the heat they emit? That is a ton of wasted energy.
You are correct, by the way. That shows that someone does not need a million BTU heater, or a 450,000 btu heater, to obtain a sufficient heat rise to blow a heater up. Something that is pretty spectacular.
 
When the say the BTU's does it mean per min, hr, instant?
 
The coils just a picture from a coil fab website but it does seem like a standard idea to split the flow.

finned tubing
calfintubes.jpg
 
Turbulent flow allows much more heat transfer. Interior of pipe could have 'turbulators'
 
I honestly don't know. I know that there is a standard rating system. I am going to have to chrck into that when i get a chance, but not today.
 
Seems like the finned tubing would provide more surface area for heat transfer. The turbulence makes sense too. Looks pricey. That may be why the burners we have aren't more efficient. The technology probably exists it just may not make sense financially. At least not yet.
 
There is also a classic fear of technology, too. People always fear something new or different.
 
Hello Scott,

It has been many years since I did the research when I rebuilt our primary system. If my memory is correct I used 100,000 Btu to heat 1 gpm 100 degrees. In fact we get about a 150 degree temperature rise.

The boiler that I had installed is rated at 980,000 Btu and the General TSF-2221 pump that we installed is rated for 10.2 gpm. The boiler is also rated for steam. We have had a couple projects that we ran it well over 300 degrees.

I purchased the boiler from Whitco in 2001. It uses Lp vapor and the coil is 3/4" x 400 feet long.

In the picture the boiler is on the left side and the General is on the lower right. The spin on oil filter that you see next to the boiler is for the engine on our Genset.

My guys can run two wands with 5.5 tips and have water temperature running in the range of 180-210 degrees. Remember in the winter time our inbound water temperature is around 35-40 degrees!

Dave Olson
 

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