Tubular heating surface
The pipe heating surface is the part of the heating surface of a steam locomotive boiler that is formed by the smoke pipes installed in the boiler through which flue gas flows . In this part of the boiler, the heat is transferred (to the heating surface), unlike in the case of the radiant heating surface , mainly by convection .
calculation
The inner diameter of the pipes is used as a basis for the mathematical calculation of the pipe heating surface.
This means that in wet steam locomotives the tubular heating surface
- x di xl h xn
where di is the inner diameter of the heating tubes, l h is the length of a heating tube and n is the number of heating tubes.
In the case of superheated steam locomotives , the smoke tubes carrying the superheater tubes are added, so that the tube heating surface
- di h xl h xn h + x di r xl r xn r
where di h is the inside diameter of the heating tubes, l h is the length of the heating tubes, n h is the number of heating tubes, di r is the inside diameter of the smoke tubes, l r is the length of the smoke tubes and n r is the number of smoke tubes.
history
With the first steam locomotives up to the end of the Länderbahn era , this tubular heating surface was practically the only evaporation heating surface of the boiler on locomotives from southern Germany. Only locomotives of the Prussian State Railways had a water-flushed fire box , which led to a more significant proportion of the radiant heating surface.
literature
- Dr. Ing. F. Meineke "The Steam Locomotive", Springer-Verlag Göttingen, 1949
Web links
Individual evidence
- ↑ Dr. Ing. F. Meineke "Die Dampflokomotive", Springer-Verlag Göttingen, 1949, page 22.