Applied Fluid Mechanics (7th Edition)
7th Edition
ISBN: 9780132558921
Author: Robert L. Mott, Joseph A. Untener
Publisher: PEARSON
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Chapter 7, Problem 7.51PP
A creek runs through a certain part of a campus where the water is falling about
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Three pumps are connected in series. According to pump performance curves, the free delivery of each pump is as follows: Pump 1: 1600 L/min Pump 2: 2200 L/min Pump 3: 2800 L/min If the flow rate for this pump system is 2500 L/min, which pump(s) should be shut off? (a) Pump 1 (b) Pump 2 (c) Pump 3 (d) Pumps 1 and 2 (e) Pumps 2 and 3
A mining company depleted more than half of its ore reserves and is no longer using all of its shaft infrastructure. It considers using one of the old shafts for pumped-storage hydro-electricity generation. This means that water will be pumped to the higher level, which is 1 000 m above the bottom level, at night when Eskom charges lower, off-peak, rates. The “higher level” will be changed into a dam (reservoir) by means of plugs that will be installed in some tunnels. The stored water has potential energy, which will be used to generate electricity for the mine at peak hours, when electricity is expensive. The pump that will be installed at the bottom of the column will also be used as a turbine for the generation of electricity The pump-as-turbine (PAT) must pump water to a height of 1 000 m through a column with an internal diameter (ID) of 345 mm.
3.1. Calculate the velocity of the water in the pipe if the quantity of water to be pumped is 220 litres per second (lps).
3.2.…
During a one year time period, how many gallons of water would the average household save by using an efficiency washer vs a regular washer? Is this one year savings more or less than the amount of water an average person drinks in a lifetime? Explain and show your assumptions, calculations, and conversions.
Consider it to be essentially 2 separate problems:
How much water is saved in a one year period when using an efficiency washer vs regular washer - answer based on your assumptions and calculations for full credit
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Compare the answers to those 2 questions to arrive at your conclusion
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there are 128 oz in a gallonthere are 365 days in a year and also 52 weeks in a year
Chapter 7 Solutions
Applied Fluid Mechanics (7th Edition)
Ch. 7 - A horizontal pipe carries oil with a specific...Ch. 7 - Water at 40 F is flowing downward through the...Ch. 7 - Find the volume flow rate of water exiting from...Ch. 7 - A long DN 150 Schedule 40 steel pipe discharges...Ch. 7 - Figure 7.14 shows a setup to determine the energy...Ch. 7 - A test setup to determine the energy loss as water...Ch. 7 - The setup shown in Fig. 7.16 is being used to...Ch. 7 - A pump is being used to transfer water from an...Ch. 7 - In Problem 7.815 (Fig. 7.17), if the left-hand...Ch. 7 - A commercially available sump pump is capable of...
Ch. 7 - A submersible deep-well pump delivers 745 gal/h of...Ch. 7 - In a pump test the suction pressure at the pump...Ch. 7 - The pump shown in Fig. 7.19 is delivering...Ch. 7 - The pump in Fig. 7.20 delivers water from the...Ch. 7 - Repeat Problem 7.14, but assume that the level of...Ch. 7 - Figure 7.21 shows a pump delivering 840L/min of...Ch. 7 - Figure 7.22 shows a submersible pump being used to...Ch. 7 - Figure 7.23 shows a small pump in an automatic...Ch. 7 - The water being pumped in the system shown in Fig....Ch. 7 - A manufacturer's rating for a gear pump states...Ch. 7 - The specifications for an automobile fuel pump...Ch. 7 - Figure 7.26 shows the arrangement of a circuit for...Ch. 7 - Calculate the power delivered to the hydraulic...Ch. 7 - Water flows through the turbine shown in Fig....Ch. 7 - Calculate the power delivered by the oil to the...Ch. 7 - What hp must the pump shown in Fig. 7.30 deliver...Ch. 7 - If the pump in Problem 7.26 operates with an...Ch. 7 - The system shown in Fig. 7.31 delivers 600 L/min...Ch. 7 - Kerosene (sg = 0.823 ) flows at 0.060m3/s in the...Ch. 7 - Water at 60 F flows from a large reservoir through...Ch. 7 - Figure 7.34 shows a portion of a fire protection...Ch. 7 - For the conditions of Problem 7.31 and if we...Ch. 7 - In Fig. 7.35 kerosene at 25 F is flowing at 500...Ch. 7 - For the system shown in Fig. 7.35 and analyzed in...Ch. 7 - Compute the power removed from the fluid by the...Ch. 7 - Compute the pressure at point 2 at the pump inlet.Ch. 7 - Compute the pressure at point 3 at the pump...Ch. 7 - Compute the pressure at point 4 at the press...Ch. 7 - Compute the pressure at point 5 at the press...Ch. 7 - Evaluate the suitability of the sizes for the...Ch. 7 - The portable, pressurized fuel can shown in Fig....Ch. 7 - Professor Crocker is building a cabin on a...Ch. 7 - If Professor Crocker's pump, described in Problem...Ch. 7 - The test setup in Fig. 7.39 measures the pressure...Ch. 7 - If the fluid motor in Problem 7.44 has an...Ch. 7 - A village with a need for a simple irrigation...Ch. 7 - As a member of a development team for a new jet...Ch. 7 - A fire truck utilizes its engine to drive a pump...Ch. 7 - A home has a sump pump to handle ground water from...Ch. 7 - In Problem 6.107 an initial calculation was made...Ch. 7 - A creek runs through a certain part of a campus...Ch. 7 - A hot tub is to have 40 outlets that are each 8 mm...Ch. 7 - A large chipper/shredder is to be designed for use...
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- This is from Chapter 10 of Sustainable Energy second edition by Richard Dunlap Two locations have the same average wind velocity. Location A has a constant wind velocity of 10 m/s, while Location B has a wind velocity of 5 m/s for 12 hours per day and a wind velocity of 15 m/s for 12 hours per day. Compare the total energy produced per day for identical wind turbines at the two locations. The energy is given by the formula E = 0.5*(air density)*(efficiency)*velocity^3*(Turbine area)*time. Keep the answer in terms of (efficiency)*(Area). **Also is v average velocity or regular, non-average velocity?***arrow_forwardA 5 kW electric motor driving a pump has an efficiency of 85%. Determine the losses encountered in the driver. a. 2500 kJ/hr b. 48.00 kJ/min c. 0.78 kW d. 2700 kJ/hrarrow_forwardPipeline Pumping of Oil. A pipeline laid cross-country carries oil at the rate of 795 m3/d. The pressure of the oil is 1793 kPa gage leaving pumping station 1. The pressure is 862 kPa gage at the inlet to the next pumping station, 2. The second station is 17.4 m higher than the first station. Calculate the lost work ( EF friction loss) in J/kg mass oil. The oil density is 769 kg/m3.arrow_forward
- 22.The potential energy for 2,000 m3 of water stored in dam at a height of 20 m is.arrow_forwardWater is pumped from a 200-ft-deep well into a 100-ft-high storage tank. Determine the power, in kW, that would be required to pump 200 gal/min.arrow_forwardThe efficiency of a hydraulic turbine-generator unit is specified to be 85 percent. If the generator efficiency is 96 percent, the turbine efficiency is (a) 0.816 (b) 0.850 (c) 0.862 (d ) 0.885 (e) 0.960arrow_forward
- In your own words, define efficiency as it applies to a device designed to perform an energy transformation.arrow_forwardA pump lifts water at the rate of 6 m3/s to a height of 120 m and the friction loss in the pipe is 10 m. What is the power in KW required if the pump efficiency is 90%? a.10257 b.7651.8 c.130 d.8502arrow_forwardConsider an automobile with a mass of 5500 lbm braking to a stop from a speed of 55 miles/h.(a) How much energy (Btu) is dissipated as heat by the friction of the braking process?(b) Suppose that throughout the United States, 300,000,000 such braking processes occur in the course of a given day. Calculate the average rate (megawatts) at which energy is being dissipated by the resulting friction.(c) Find a source of information on the average per-capita consumption of electricity (kW) in the United States, France, and India. Roughly how many people in each country would have their electricity needs met if the braking energy calculated in Part (b) could be recovered and used to provide electricity? Show your calculations and identify your information source.arrow_forward
- 30 - The shaft power taken from a turbine with 90% efficiency is 400 kW. Since 570 kg/s of water passes through the turbine, what is the charge drawn from the fluid? a) 139 meters B) 79.5m NS) 67.3m D) 47.8m TO) 98.5marrow_forwardA turbine is located at an elevation 200 m below that of the surface of the water intake. The friction loss in the pipeline leading to it is 8 m and the turbine efficiency is 90%. What is the power input delivered by the water to the turbine if the flow is 3.0 m^3/s in kW? CHOICES: a.5650.56 b.5690. 45 c.5050.78 d.5085.50arrow_forwardA pump continuously supplies water to an open tank for 12 hours daily. If the theoretical horsepower for the process is 4 hp (1 hp = 550 (ft∙lb_f)/s) and the pump is 65% efficient, determine the total monthly cost. Assume electricity costs 4.5 Php/kWh.arrow_forward
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