Sustainable Energy
1st Edition
ISBN: 9781133108689
Author: Richard A. Dunlap
Publisher: Cengage Learning
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Water is flowing in a 90° triangular channel at a depth of 39 cm. A hydraulic jump occurs. The depth after the jump is 126 cm.
a. What is the discharge?b. What is the decrease in specific energy caused by the jump?c. What is the head loss in kW?
Compute the energy loss that would occur as 27 gal/min of water flows from a tank into a steel tube with an OD of 3.0 in and wall thickness of .025 in. The tube has a rounded inlet of radius (r) of .118 in.
Calculate the specific energy of 13 m3/s of water flowing with a velocity of 1.5 m/s in a rectangular channel 7.5 m wide. Find the depth of water in the channel when the specific energy would be minimum. What would be the value of critical velocity as well as minimum specific energy?
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- 5. Water is pumped 14.5 km from a reservoir at elevation 30 m to another reservoir at elevation 70 m. The steel pipeline connecting the reservoirs has a nominal diameter of 1400 mm (the actual inside diameter is 1372 mm) with C = 90. If the flow is 1.18 m3/s, the pumping efficiency is 82%, and electricity costs $0.14/kWh. Assuming that the density of water is 1000 kg/m3, what will be the monthly power bill? Sketch the hydraulic and energy grade lines.arrow_forwardExample 10.1. A town with a population of 1 million has a con- tinuous water supply. Average supply in 270 lpcd, the water being supplied by direct pumping. The total supply of 270 lpcd is phased as follows: Time 5 A.M. to 11 A.M. 11 A.M. to 3 P.M. 3 P.M. to 9 P.M. 9 P.M. to 12 midnight 12 midnight to 5 A.M. Water is supplied from the treatment plant at a uniform rate of 11.25 million litres per hour, for all the 24 hours. Find out the capacity of the reservoir required for distribution of water. Assume no loss or drawal from the trunk main. (A.M.I.E., May 1963) lpc 90 54 81 27 18arrow_forwardA coal-fired power plant discharges 1 m^3/s of cooling water into a river, which has a flow of 9 m^3/s and a temperature of 20 degree C. According to the regulation, the temperature in the river immediately below the discharge cannot be increased by higher than 1 degree C. Therefore, what is the highest temperature of the cooling water is allowed for discharge?arrow_forward
- Explain the relationship between efficiency n ,head H, inflow power Pi and the best efficiency point (BEP) of a centrifugal pump.arrow_forwardWater leaving the nozzle at a velocity of 4350 m/min with a volume flow rate of 0.736 m³ . if the density of water is 0.000997 kg/cm³ . How will you determine the potential for power generation in a hydraulic turbine .arrow_forward[CE Hydraulics] 3. In a pipeline with converging diameter, will the gradient of the total energy line be steeper or milder than the gradient of the piezometric head line? Why?arrow_forward
- A manufacturing facility consumes 40 m^3/h of water taken from a nearby river located 15 m below the factory tank.Calculate the daily pumping cost if water is conveyed through a 3in, 240 m-long pipe, including friction losses. The cost of electrical energy is 0.831 pesos/kilowatt-hour and the pump operates with 80% efficiency.arrow_forwardWhat is the cost to pump 1000 liters of water to the top of a 30 m high water tank? Assume a pumping efficiency of 50% and an electrical cost of $0.15 per KW-h. P(h2O) = 1000 ?g/m^3 . 1 m^3 = 1000 litersarrow_forwardA centrifugal pump discharging 10 lps against 25 m of head and operating with an efficiency of 60% requires 4.1 kW at 1000 rpm. What is the theoretical discharge if the speed is increased to 1500 rpm assuming the efficiency remains constant? What is the theoretical head and kW at 1500 rpm?arrow_forward
- A turbine is rated at 600hp when the flow of water through it is 82cu.m/sec. Assuming an efficiency of 92%, what is the head acting on the turbine?arrow_forwardb) Water flows from a large reservoir through a pipe system which consists of 200 mm diameter ofpipe and 50 mm diameter of nozzle as shown in Figure 3. By neglecting all energy losses, calculate;(iii) Total energy at Aarrow_forwardPROBLEM 5: A turbine, located at an elevation 255 m below that of the water surface at intake, carries a flow of 3.5 m^3/s. The head loss in the pipeline leading to it is 10 m. Find the horsepower delivered by the turbine if its efficiency is 92%. (746 watts = 1 HP). Illustrate the problem and show your complete solution.arrow_forward
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