Problem 6.23:
Water is pumped at a flow rate of 2.25 kg/min from 1 bar 20 °C to 15 bar. Determine the amount of work and the temperature of water at the exit if the efficiency of the pump is 78%.
Problem 6.24:
A 10 kW pump is used to pump liquid ammonia from 5 bar and 0 °C to 25 bar. The efficiency of the pump is 62%.
a) What is the mass flow rate (kg/s) delivered by the pump?
b) What is the temperature at the exit of the pump?
c) Calculate the rate of entropy generation (in kW/K).
Additional data for liquid ammonia: density = 0.64 g/cm3; CP = 1.1 kJ/kg K; β = 2.095 × 10-3 K-1.