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Electrical power

Figure P1-33 illustrates a pumped-hydroelectric storage system. During a 12-hr period at night when the demand for electricity is low, electrical motor-driven pumps transfer water from the lower reservoir to the higher reservoir. During the 12-hr period in the daytime when the electrical demand is high, water from the upper reservoir is discharged through turbines

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Permanent natural sources

Since the early 19OOs,the Grand Canyon has become a popular attraction for tourists. The lack of potable water is a major hindrance to visitors, however, as permanent natural sources of water are rare or nonexistent on the canyon rim. The Utah Parks Company plans to construct a 12,500-ft pipeline of schedule 80 commercial steel pipe

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English Channel Tunnel

A cooling system has been constructed for the English Channel Tunnel or “Chunnel,” which runs 130 ft below the seabed, linking Great Britain and France. The Chunnel consists of three tunnels, each 31 miles long. Passengers and cargo trains travel in the two main tunnels (7.6 m in diameter) at speeds up to 100 mph.

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Engine test stand

Liquid oxygen (LOX) used in a rocket test facility is stored in an insulated tank that is vented to the atmosphere. During a test of the Space Shuttle Main Engine (SSME), the LOX flow rate is required to be 885 lbm/s. The nominal combustion-chamber pressure is 2,970 psia. The LOX storage tank is located 1,000

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The pipe pressure drop

Air conditioning for a university campus is provided by chilled water pumped through a main supply line ..The pipe-which makes a three-mile loop around the campus, is made of commercial steel and must be sized to handle 12,000 gpm. Chilled water enters the pipe at 38°F and leaves at 59°F.The pump/motor efficiency is 67 percent;

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Pumping stations

The Alaskan pipeline runs 798 miles from Prudhoe Bay to Valdez. Both cities are located at sea level. The design specifications for the pipeline require a capacity of 2.4 million barrels per day (1 barrel of oil = 42 gallons). The crude oil, which is maintained at 140°F,has a specific gravity of 0.86 and a

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Heat exchanger

1. Why is the effectiveness ~of a heat exchanger a good measure of the amount of energy that could be exchanged from two streams at different temperatures? 2. Are fins constructed from a low-k or a high-k material more effective? Explain. 3. Are fins more effective when added to a high- he or a low-

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Cooling water

Cooling water is to be pumped from a reservoir to rock drills at a quarry site using the system sketched in Fig. P1-40. The required flow rate is 600 gpm, and the water must leave the nozzle at 120 ft/s. The system is operated 80 hr per week. Electricity costs are $0.05/kWh energy charge and

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