Water, recirculating at the rate of $60$ lb$/$min around the cylinder of an air

compressor, enters at $70$ oF and leaves at $80$ oF$,$ all heat received coming from the air in the

cylinder. The compression is internally reversible from $14\mathrm{.}7$ psia, $80$ oF$,$ to $330$ oF$.$ For an air

flow of $50$ lb$/$min$,$ find a$)$ the work in Hp$,$ b$)$ Change of entropy for the air, c$)$ the available part

of the heat with respect to the air and again as it was received by the water if to $=60$ oF$.$