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rangerssteamtoys
Steam Legend!!
Joined: 17 Jul 2007
Posts: 2126
Location: Houston Texas, USA
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 Posted: Tue Oct 23, 2007 12:35 pm Post subject: |
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| MooseMan wrote: | [quote="Mister Occlusion"Of course, heat up the stack is heat wasted, but then you've got the same situation with horizontals and heat wafting rapidly up the sides.
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Well, that's what I used to think, until I got an engine on which the firebox had been replaced by a very tight fitting number where the hot air wouldn't waft up the sides....wouldn't run for toffee until I allowed for air passage....I've since had to remedy a similar problem in a Bowman loco. The flow of hot air around a boiler and in the case of the 455 through the flue makes a huge contribution to the steam raising capacity of the boiler.[/quote]
And if no hot air get past the sides it will be trapped and put out the fire.
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Mister Occlusion
Steam Legend!!
Joined: 28 Jul 2007
Posts: 3718
Location: Canada
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| Posted: Tue Oct 23, 2007 2:29 pm Post subject: |
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Oh I realize that, I'm just saying that there's still a whole pile of calories that go to waste.
But then no one has ever accused these things of being efficient 
I wonder, though, if there is a (do it yourself way) to calculate the thermal yield of a tray of, say, 6 esbit at peak output and compare it with that of a 450 watt electric heater?
It's a made to measure test bed: a wafty Jensen 75 compared with a well insulated Model 25.
I'd wager the 25 is more efficient in its heating by a measurable degree.
.... Perhaps do a study of temperature rise in a boiler of room temp water over the course of 5 minutes (or however long it takes to boil). Both heat sources start from cold, but the warmup time of each is a bit of a variable that's hard to deal with: Time for the heater to reach peak output vs time for the fuel tray to become fully involved.
I might have to try that some day 
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steamyjim
Steam Legend!!
Joined: 27 Oct 2006
Posts: 5087
Location: Pensford Somerset
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| Posted: Tue Oct 23, 2007 2:32 pm Post subject: |
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| Quote: | Of course, heat up the stack is heat wasted, but then you've got the same situation with horizontals and heat wafting rapidly up the sides.
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Not true. The heat up the stack is actually a boiler tube. This heats the water from the inside aswell as from the bottom. This makes the engine more efficiant as the heat produced is used in a better way to make steam.
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steamyjim
Steam Legend!!
Joined: 27 Oct 2006
Posts: 5087
Location: Pensford Somerset
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johnreid
Steam Supreme Being
Joined: 06 Sep 2007
Posts: 10683
Location: Friendship Indiana, USA
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| Posted: Tue Oct 23, 2007 4:40 pm Post subject: |
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Well, if nothing else we are learning things.
I have seen some less expensive verticals that do not have an efficient way to distribute the heat like the 455 or your Cheddars and in that count the Horizontal would be more efficient.
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