FUND OF ENG THERMODYN(LLF)+WILEYPLUS
9th Edition
ISBN: 9781119391777
Author: MORAN
Publisher: WILEY
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1. A pump is used to lift 11 CMH of water at 20°C from a nearby fresh water lake whose free surface is 2.5 meters below
the pump centerline to an elevated water dam whose free surface is 10 meters above the pump centerline. The suction
pipe and discharge pipe are DN 8 SCH 40 and DN 10 SCH 40, respectively. The suction pipe has a total length of 5.4
m, while the discharge pipe has a total length of 21 m. Assume Hazen-Williams coefficient of 140 for both suction and
discharge pipes and ignore minor head losses.
a. Draw a schematic of the problem. Clearly indicate the elevations with respect to the pump centerline.
b. Calculate the total dynamic head of the pump in meters.
c. Calculate the water power output of the pump in kW.
d. Calculate the brake power input to the pump in kW, assuming a pump mechanical efficiency of 75%.
e. Calculate the electrical power input to the pump in kW, assuming a motor efficiency of 90%.
in a rankine cycle, what is the entrance pressure of the turbine if the condenser pressure is 105 kpa and the pump work is 20 kj/kg. use density of water entering the pump, 950 kg/m^3.
Pls. answer thank you!
In a 13 MW geothermal power plant, the mass flow of steam entering the turbine is 30 kg/s. The quality after throttling is 23% and enthalpy of ground water is 730 KJ/kg. Determine the overall efficiency of the plant.
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