On Jul 24, 6:38*am, "Roger Traviss"
wrote:
Enthalpy change from superheated steam at 10bar/500C to saturated
water at 1bar/100C: 3052.1 - 417.5 = 2634.6 kJ/kg.

Enthalpy change from superheated steam at 10bar/500C to saturated
water at 0.05bar/32.9C: 3052.1 - 137.8 = 2914.3 kJ/kg.

Extra enthalpy available: 2914.3 - 2634.6 = 279.7 kJ/kg ~ 10%.

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Huh? *Wot's that in English then?

--
Cheers
Roger Traviss

Photos of the late GER: -http://www.highspeedplus.com/~rogertra/

For more photos not in the above album and kitbashes etc..:-http://s94.photobucket.com/albums/l99/rogertra/Great_Eastern/

Just think of it as energy. Near enough.

You get extra energy into the steam by conducting it away from the
boiler and heating it up some more. (Superheating)
This is done for virtually all steam engine/turbine applications.
But undesireable for steam heating.