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, %3D 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. 50.20 m ø r0.15 mø

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, %3D 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. 50.20 m ø r0.15 mø

Refrigeration and Air Conditioning Technology (MindTap Course List)

8th Edition

ISBN:9781305578296

Author:John Tomczyk, Eugene Silberstein, Bill Whitman, Bill Johnson

Publisher:John Tomczyk, Eugene Silberstein, Bill Whitman, Bill Johnson

Chapter40: Typical Operating Conditions

Section: Chapter Questions

Problem 10RQ: The seasonal energy efficiency ratio (SEER) includes the energy used in the _____and _____cycles.

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Problem 2. A garden hose with an attached nozzle is used to fill a container with water. The nozzle starts at a diameter of 2 cm and is then reduced to 0.8 cm at the exit. In 50 seconds, the nozzle and hose are able to fill the container with 10 gallons of water. Find the volumetric flow rate (m³/s), the mass flow rate (kg/s), and the average velocity (m/s) at the at the nozzle exit. Assume the density p of water is 1000 kg/m³.
8. A wind turbine receives air at 50kph and receives energy from it then the flowmeter behind it reads 10kph. Assuming no change in internal energy of the air, find the specific work in J/kg that the turbine will receive assuming no losses in friction.
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?
Q2: A reaction turbine has guide vanes at an angle of 30° and the runner blades make an angle of 80° relative to the tangent at inlet. The blades width at the inlet is % of the outer diameter. The water does not have any tangential velocity at the outlet. The head is 25 m and the rotational speed of the runner is 16.67 rotations per second. The turbine efficiency is 88 %. Determine the turbine runner diameter at the inlet and the power developed.
What is the turbine output of 100m head and delivering 1 cu. m/ sec in a hydro electric power plant if turbine efficiency is 88%?
2. A hydroelectric plant has 20 MW generator with an efficiency of 96%. The generator is coupled to a turbine having an efficiency of 80%. The total gross head on the turbine is 150 m while the head loss due to friction is 4% of the gross head. Find the volumetric flow rate of water.
1. A fuel pump is delivering 10 gallons per minute of oil with a specific gravity of 0.83. the total head is 9.15m. Find how much energy/power does the pump consumes in kJ per hour. 2. A pump driven by an electrical motor moves 25 gallons per minute of water from a reservoir A to B, lifting the water to a head of 245 ft. The efficiency of the pump is 65%. Neglecting velocity head, friction head and minor losses; What power input in horse power is required?
A fountain and a water tank will be powered by water from a nearby lake. The elevations and pipe connections are depicted in the diagram below. The fountain's jet water should reach a height of at least 2.5 m from the nozzle outlet. The tank, on the other hand, is elevated to allow gravity to distribute water. The table below contains the specifications for nozzles, suction and discharge pipes. What is the minimum power input to the pump in kW, assuming negligible minor head losses? Assume that the pump efficiency is 88 percent and the motor efficiency is 95 percent. The fountain's water is returned to the lake via a drainage system.
1. A centrifugal pump has external and internal diameters of 300 mm and 150 mm respectively. The vane angles of inlct and outlet are 25 and 30° and the pump runs at 1450 r.p.m, If the velocity of flow through the pump is constant, find the work done per kN of water. (Ans. 20-2 kJ)
b. The discharge pressure of an air compressor is 6 times the suction pressure. If the volumeflow rate at the suction is 0.86 cubic meters per second, what is the compressor power (kW)for n = 1.38 and suction pressure is 101 kPaa?
Q3. A storage tank is filled with water from a river by using a pump at a rate of 100 L/s, as shown in the below figure. Storage tank 15 m Pump The motor is operated at an energy consumption of 250V and 80 amp with the shift rotating speed of 950 RPM at a torque of 8.5 N.m. By ignoring the changes in the kinetic energy and the frictional losses in the pipe, Calculate the following: a) pump-motor unit efficiency. b) motor efficiency. c) difference in pressure between the inlet and the exit of the pump
A mixed type reaction turbine has D1= 3m and D1= 2.1m. Inlet and outlet Vane angle 60° & 150° respectively and thickness of 30 cm parallel to axis of rotation with guide vanes angle of 15° and a flow rate of 10 m/s . a) Calculate the required speed of the runner for smooth flow at inlet. b) If the velocity of flow remains constant and the discharge is radial find the power developed and the work done, also find the hydraulic losses, total head, and overall efficiency.