The internal efficiency of a simple steam engine operating
on dry(ish) saturated steam and condensing at about 35 degC
depends on the working pressure. For 7 bar (absolute) the
figure is close to 25%. That is, 25% of the enthalphy of
the steam is converted into useful work. There are load of
other inefficiencies to take into account, e.g. boiler,
losses, leaks etc
Earlier boilers could not maintain high pressures, and
until Watt came alond, the improvement which could be
obtained by have a low condensation temperature had not
been appreciated.
I hope this helps.
Malcolm Henry
On Sun, 2 Jan 2000 16:12:52 -0000
[log in to unmask] wrote:
> I am trying to obtain typical values for the efficiencies of Cornish
> pumping and whim engines, both horizontal and beam types.
>
> Can anyone advise as to where such data can be obtained, and
> how to convert such data to SI units? Are there any subtle pitfalls
> that should be observed?
>
> My second query concerns Lean's Engine Reporter. Does anyone
> know when it was stopped being produced and exactly what data
> did it record? Is there a source of transcripts from this publication?
>
> Any advice is appreciated!
>
> Martin Roseveare
----------------------
Malcolm Henry
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