[Steam-engine] heating surface

[Robert Smith]

Dan Donaldson wrote:
> The area of the front tube sheet should be included as well.
>

    I've seen that argued on the the basis that by the time the
combustion gases get there they are too cool to contribute much more
energy and on a well drafted boiler they pretty much head directly up
the stack anyway.

They are really great for roasting ear corn however!!

So in the interest of conservative engineering and the level of
precision that we are working at, I pretty much ignore the front flue
sheet.

    Bob Smith

>
>
> -----Original Message-----
> From: steam-engine-bounces at lists.stationary-engine.com
> [mailto:steam-engine-bounces at lists.stationary-engine.com] On Behalf Of
> Robert Smith
> Sent: Monday, July 24, 2006 2:06 PM
> To: Steam-engine mailing list
> Subject: Re: [Steam-engine] heating surface
>
> Andre ---
>
> This is what you should get.
>
> Pi = 3.141592654
>
> Diameter of tube = 2.000
>
> Circumference of tube = Pi * D
>
> Area of tube = Circumference * length
>
> Thus:
>
> Heating surface = Pi * D * L =  3.14159 * 2.0 * 45 = 282.743  "Sq or
> 1.963 Ft Sq.
>
> Exactly as you wrote,  Congratulations!!!!!!!!!!!!!!!!
>
> Note, times the total number of tubes plus the effective heating area
> of your fire box gives the
> total heating area of your boiler which can be used to estimate the
> steaming horsepower of your boiler.
>
>     Best wishes and happy steaming,
>
>         Bob Smith
>
>
> Andre' Blanchard wrote:
>> 2" * Pi * 45"
>> 2 * 3.142 * 45 = 282.8 sq. in.
>> 282.8 / 144 = 1.96 sq. ft.
>>
>>
>> At 11:22 AM 7/24/2006, you wrote:
>>> I most likely should have payed closer attention in math class, but
>>> no one ever taught it as it applies to steam engines.  (what a great
>>> idea!)  anyhow does anyone care to educate me on the heating surface
>>> of a tube?  It is 2" in diameter and 45 inches long.  I keep getting
>>> interesting answers.... but am not sure they are right.
>>>
>>>   thanks
>>
>> __________
>> Andre' B.  Clear Lake, Wi.
>>
>>
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