The demand for electric power is usually much higher during the day than it is at night. and utility companies often sell power at night at much lower prices to encourage consumers to use the available power generation capacity and to avoid building new expensive power plants that will be used only a short time during peak periods. Utilities are also willing to purchase power produced during the day from private parties at a high price. Suppose a utility company is selling electric power for $0.06/kWh at night and is willing to pay $0.1 3/1Wh for power produced during the day. To take advantage of this opportunity, an entrepreneur is considering building a large reservoir 50 in above the lake level, pumping water from the lake to the reservoir at night using cheap power. and letting the water flow from the reservoir back to the lake during the day, producing power as the pump-motor operates as a turbine- generator during reverse flow. Preliminary analysis shows that a water flow rate of 2 m 3 /s can be used in either direction, and the irreversible head loss of the piping system is 4 in. The combined pump--motor and turbine-generator efficiencies are expected to be 75 percent each. Assuming the system operates for 10 h each in the pump and turbine modes during a typical day, determine the potential revenue this pump-turbine system can generate per year.
The demand for electric power is usually much higher during the day than it is at night. and utility companies often sell power at night at much lower prices to encourage consumers to use the available power generation capacity and to avoid building new expensive power plants that will be used only a short time during peak periods. Utilities are also willing to purchase power produced during the day from private parties at a high price. Suppose a utility company is selling electric power for $0.06/kWh at night and is willing to pay $0.1 3/1Wh for power produced during the day. To take advantage of this opportunity, an entrepreneur is considering building a large reservoir 50 in above the lake level, pumping water from the lake to the reservoir at night using cheap power. and letting the water flow from the reservoir back to the lake during the day, producing power as the pump-motor operates as a turbine- generator during reverse flow. Preliminary analysis shows that a water flow rate of 2 m 3 /s can be used in either direction, and the irreversible head loss of the piping system is 4 in. The combined pump--motor and turbine-generator efficiencies are expected to be 75 percent each. Assuming the system operates for 10 h each in the pump and turbine modes during a typical day, determine the potential revenue this pump-turbine system can generate per year.
The demand for electric power is usually much higher during the day than it is at night. and utility companies often sell power at night at much lower prices to encourage consumers to use the available power generation capacity and to avoid building new expensive power plants that will be used only a short time during peak periods. Utilities are also willing to purchase power produced during the day from private parties at a high price.
Suppose a utility company is selling electric power for $0.06/kWh at night and is willing to pay $0.1 3/1Wh for power produced during the day. To take advantage of this opportunity, an entrepreneur is considering building a large reservoir 50 in above the lake level, pumping water from the lake to the reservoir at night using cheap power. and letting the water flow from the reservoir back to the lake during the day, producing power as the pump-motor operates as a turbine- generator during reverse flow. Preliminary analysis shows that a water flow rate of 2 m3/s can be used in either direction, and the irreversible head loss of the piping system is 4 in. The combined pump--motor and turbine-generator efficiencies are expected to be 75 percent each. Assuming the system operates for 10 h each in the pump and turbine modes during a typical day, determine the potential revenue this pump-turbine system can generate per year.
Copyright 2013 Pearson Education, publishing as Prentice Hall
2. Determine the force that the jaws J of the metal cutters exert on the smooth cable C if 100-N
forces are applied to the handles. The jaws are pinned at E and A, and D and B. There is also
a pin at F.
E
400 mm
15°
D
B
30 mm² 80 mm/
20 mm
15°
$15°
20 mm
400 mm
15°
100 N
100 N
15°
Draw for it make a match which direction
Q.1) Block A is connected to block B by a pulley
system as shown. The weights of blocks A and B
are 100 lbs and 70 lbs, respectively. Assume
negligible friction between the rope and all pulleys
as well as between block B and the incline and
neglect the mass of all pulleys and cables.
Determine the angle 0 required to keep the system
in equilibrium. (At least two FBDs must be drawn
for full credit)
B
Ꮎ
000
Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, mechanical-engineering and related others by exploring similar questions and additional content below.