Question

A 2-kg/s flow of steam at 1 MPa, 700°C should be brought to 500°C by spraying in liquid water at 1 MPa, 20°C in an steady flow. Find the rate of irreversibility, assuming that surroundings are at 20°C

Answer 1

C.V. Mixing chamber, Steady flow. State 1 is superheated vapor in, state 2 is compressed liquid in, and state 3 is flow out. No work or heat transfer.

For state 2 interpolate between, saturated liquid 20°C and, compressed liquid 5 MPa, 20°C from  h₂ = 84.9, s₂ = 0.2964