Problem $4$ Part C

Air and steam flow through the devices in the diagram below. The air enters the

turbine at $1580K,\frac{13}{b}ar.$ The steam enters the turbine at $520C,\frac{100}{b}ar$ and exits

at $0\mathrm{.}08$ bar. Both turbines operate with an isentropic efficiency of $85\%.$ The air exits

the heat exchanger at $400$ K and $1$ bar $.$ The air flows at $370k\frac{g}{s}$ and the steam flows

at $60k\frac{g}{s}.$ Assume constant specific heats for the air, evaluating at $300$ K $.$

Determine the enthalpy of the water entering the heat exchanger $(k\frac{J}{k}g)$