The main water line into a tall building has a pressure of 600 kpa at 5 m below ground level, as shown in fig. below. a pump brings the pressure up so that the water can be delivered at 200 kpa at the top floor 100 m above ground level. assume a flow rate of 10 kg/s liquid water at 10°c and neglect any difference in kinetic energy and internal energy u. find the pump work.

Liquid flows at steady state at a rate of 2 lb/'s through a pump, which operates to raise the elevation of the liquid 100 ft from control volume inlet to exit. the liquid specific enthalpy at the inlet is 40.09 btu/lb and at the exit is 40.94 btub. the pump requires 3 btu/s of power to operate. if kinetic energy effects are negligible and gravitational acceleration is 32.174 tt/s, the heat transfer rate associated with this steady state process is most closely 1)-2,02 btu/s from the liquid to the surroundings 2)-3.98 btu/s from the surroundings to the liquid. 3)-4.96 btu/s from the surroundings to the liquid. 4)-1.04 btu/s from the liquid to the surroundings.