A pump, with an isentropic efficiency of ? = 0.75, takes
saturated liquid water at an initial pressure of 1.0 kPa
(0.001 MPa) to a final pressure of 6000 kPa (6.0 MPa).
1. How much work is required for the pump to move 1 kg of
water?
(Assume the specific volume of the water entering the pump to be v
= 0.001 m3/kg.)
2. What is the enthalpy of the water leaving the pump?
(Assume the enthalpy of the water entering the pump to be h = 29.3
kJ/kg.)
3. What is the power required for the pump at a steam flow rate of 1 kg/s?
4. If electricity costs $25 per MWhr what is the value of the
electrical power consumed by the pump in a
day?