FUNDAMENTALS OF THERMODYNAMICS
10th Edition
ISBN: 9781119634928
Author: Borgnakke
Publisher: WILEY
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6. A pump is delivering water from the
surface of a lake to a tank 20m above at a
rate of 70L/s while the pump label suggests
it consumes 18kW of electric power. If all
the loses and any changes of kinetic energy
are negligible, a. What is the pump
efficiency? b. What is the pressure rise of
water in the pump?
1. Oil (sg = 0.82) enters a pump through a 20 cm diameter pipe at 40 kPa. It leaves the pump
at 125 kPa through a 15 cm diameter pipe. If the flow rate is 75 L/sec,
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a. Find the rate at which energy is delivered to the oil by the pump in Joules/Newton.
Assume suction and discharge sides of the pump are at the same elevation
b. Find the output hp of the pump. (
c. If the efficiency of the pump is 82%, find the rating of the pump.
-0.20 m ø
F0.15 mø
A steam turbine receives a steam flow rate of 2kg/s and the power output is.
700 kW. The heat loss from the casing is negligible. B. when the velocity at the
entrance is 60 m/s, the velocity at exit is 360 m/s, and the inlet pipe is 3 m above
?the exhaust pipe, the change of specific enthalpy across the turbine is
700 kJ
600 kJ
400kJ
non of the above
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- A 650 bhp Diesel Engine with 6 cylinders has a brake thermal efficiency of 36 % and a jacketwater loss of 27%. It uses a closed cooling system with a cooling tower 10 meters high. Thetemperature rise after passing the water jacket is 12 °C and the cooling tower range is 5 °C. Make asketch showing the vital parts of the cooling tower system and calculate:a) capacity of the jacket water pump in GPMb) exhaust loss if the friction, radiation and other losses total 8%.c) cooling water flow rate in the cooling tower in liter/hrd) standard size electric motor to drive the raw water pump if the total dynamic head is 35 meters and the pump efficiency is 84%arrow_forwardPlease include a diagram.A pump supplies water at a flow rate of 4ft3/s from an open reservoir through a horizontal 8-in sched 40 pipe. The head loss from the reservoir to the suction of the pump is 2 ft-lbf/lbm, and the discharge is at 90 psig into a 6-in sched 80 pipe. The pump has an efficiency of 65% answer the following:a.) The head that must be delivered by the pump to the water is ________ or energy developed by the pump or output energy of the pumpb.) input energy to the pumpc.) Rated power of the pump in kWarrow_forwardWater from a reservoir A 10 m elevation is drawn by a motor-driven pump to an upper reservoir B at 72 m elevation. Suction and discharge head loss is 0 0.15 m. For the discharge rate of 15 liters per second, find the power input to the motor if the overall efficiency is 8 percent.arrow_forward
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