Steam at 4 mpa and 400 °c enters a nozzle steadily with a velocity of 60 m/s, and it leaves at 2 mpa and 300 °c. the inlet area of the nozzle is 50 cm2 , and heat is being lost at a rate of 75 kj/s. determine (a) the mass flow rate of the steam, (b) the exit velocity of the steam, and (c) the exit area of the nozzle.

Estimate the change in specific internal energy au and specific enthalpy h from inlet to outlet for ethylene glycol (a liquid) flowing through each of the following devices: (a) a heat exchanger where the glycol temperature increases from 20 °c to 80 °c; (b) a pump operating at about 25 °c and increasing the glycol pressure from 100 kpa to 8 mpa.