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Fresh water can be produced from salt water by evaporation and subsequent condensation. An example is shown in Fig. P8.45, where 150 kg/s salt water, state 1, comes from the condenser in a large power plant. The water is throttled to the saturated pressure in the flash evaporator and the vapor, state 2, is then condensed by cooling with sea water. As the evaporation takes place below atmospheric pressure, pumps must bring the liquid water flows back up to P0. Assume that the salt water has the same properties as pure water, the ambient is at 20?C, and there are no external heat transfers. With the states as shown in the table below, find the irreversibility in the throttling valve and in the condenser.
A construction firm purchased 3 tractors from a certain company. At the end of the fifth year, let E1, E2, E3 denote, respectively, the events that tractors no. 1, 2, and 3 are still in good operational condition.
Aerotron Electronics is considering purchasing a water filtration system to assist in circuit board manufacturing. The system costs $40,000. It has an expected life of 7 years at which time its salvage value will be $7,500.
The secondary clarifier actually produces 3,000 mg/l Xr, but RAS stays at 25% as originally planned. Do F/M, MLVSS and SRT change from what was planned?
Describe the crystalline or atomic structure of the following minerals: 1) Brucite 2) Gibbsite 3) Bentonite 4) Illite
The motion of a box on a spiral conveyor is defined by the following position vector: r = 0.5sin(2t) i + 0.5cos(2t) j - 0.2t k where r is in meters and t is in seconds. Find the location, velocity, and acceleration when t = 0.8 s.
The cost of tuition at a certain public university was $120 per credit-hour 7 years ago. The cost today (exactly 7 years later) is $255. The annual rate of increase is closest to
The heat losses through the walls, windows, and the roof are estimated to be 130,000 Btu/h. Determine if the theater needs to be heated or cooled.
The relative error of the difference in elevation between two benchmarks directly connected in a level circuit and located 90 km apart is ±0.009 m. What order and class of leveling does this represent?
Assume a time to peak of 15 minutes and the unit peak discharge is 7.0 cfs/in, using the Gamma Function Unit Hydrograph what is the unit discharge at 20 minutes
Are either of the Ax or Jx forces relevant to finding the tension between H and J? If so, what is the easiest way to solve for those 2 unknowns?
A rectangular beam made using concrete with f'c = 6000 psi and steel with fy=60000 psi has a width b= 20 in. The concrete modulus of rupture fr=530 psi.
Discuss sources of water that are useful or potentially useful and discuss surface and groundwater.
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