Discussion
Returning condensate at 90 \( ^\circ \)C instead of using make-up at 30 \( ^\circ \)C saves, per kilogram of feed, about
Answer: C
Correct answer: 251 kJ
\[ c_p \Delta T = 4.19 \times (90-30) = 251\ \mathrm{kJ/kg}. \] Only the sensible heat between the two feed temperatures is saved - the latent heat of 2257 kJ/kg is a distractor, since the boiler must supply that in either case. Against a total of roughly 2700 kJ/kg this is about nine per cent of the fuel.
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