Engineering
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EP Electric has identified two new methods to treat its cooling water. Alternative D(for inflow) would treat the raw water with a conventional reverse osmosis system so that the cycles of concentration could be increased from 5 to 20, This will result in water cost savings of $360,000 per year and chemical cost savings of $56,000 per year. The initial cost of the equipment will be $2.3 million with an operating cost of $125,000 per year Alternative B (for blowdown) will treat the cooling tower blowdown water using a highpressure seawater reverse osmosis system to recover most of the water that is sent to an evaporation pond. This option will result in water sav- ings of $270,000 per year. The cost of the system will be $1.2 million with an operating cost of $105,000 per year. Assuming one of the two methods must be installed, determine which is preferred on the basis of the incremental ROR value using MARRof 5%per year, which is a typically low return expected of government projects. Use a 10-year study period with no salvage value for either system. (Note: See Problem 8.41 for more on this situation.)
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Subject:
Engineering -
Author:
koko4 -
Created:
7 months ago
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Air at 27°C and a velocity of 5 m/s passes over the small region As (20 mm × 20 mm) on a large surface, which is maintained at Ts = 127°C. For these conditions, 0.5 W is removed from the surface As. To increase the heat removal rate, a stainless steel (AISI 304) pin fin of diameter 5 mm is affixed to As, which is assumed to remain at Ts = 127°C. (a) Determine the maximum possible heat removal rate through the fin. (Hint: look back to Chapter 3 to see which fin case produces the maximum heat transfer.) (b) What fin length would provide a close approximation to the heat rate found in part (a)? (Hint: refer to Example 3.9.) (c) Determine the fin effectiveness, εf. (d) What is the percentage increase in the heat rate from As due to installation of the fin? In other words, what is the percentage increase in q obtained by adding the fin as compared to not having the fin?
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Subject:
Engineering -
Author:
eleanorfuller -
Created:
7 months ago
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What are the nominal dimensions for a 1x2 stick of lumber, a 2x4 stick of lumber and a standard sheet of plywood?
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Subject:
Engineering -
Author:
mohammedphfi -
Created:
8 months ago
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If you have a hole diameter of 0.250 with a tolerance of ±0.005, what are the limits of the hole size?
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Subject:
Engineering -
Author:
chasity -
Created:
1 year ago
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Drilling creates vertical holes in a workpiece, while milling can machine complex 3d surfaces along with simple horizontal and vertical lines. true or false
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Subject:
Engineering -
Author:
gabriella -
Created:
1 year ago
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Negative Sentences Put the verbs into the correct tense (simple past or present perfect simple). 1. I (see / not) ________________ anyone yet. 2. Phil (go / not) ________________ to the cinema last night. 3. We (be / not) ________________ to the zoo so far. 4. She (arrive / not) ________________yet. 5. Emily (visit / not) ________________ me last week.
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Subject:
Engineering -
Author:
durán30 -
Created:
1 year ago
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Three single-phase, 10 kVA, 460/120 V, 60 Hz transformers are connected to form a three-phase 460/208 V transformer bank. The equivalent impedance of each transformer referred to HV side is 1.0 +j2.0 Ω. The transformer delivers 20 kW at 0.8 pf leading. Answer the following questions:
(a) Draw a schematic diagram showing the transformer connection.
(b) Determine the magnitude of transformer primary and secondary winding currents.
(c) Determine the primary voltage magnitude for this operating condition. Determine the voltage regulation
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Subject:
Engineering -
Author:
carmenovog -
Created:
8 months ago
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Many of the conductance testers have integrated printers.
Select one:
O True
O False
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Subject:
Engineering -
Author:
freewaygsva -
Created:
8 months ago
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Aref hints that he is like a butterfly. Fill in the blank to explain how Aref is like a butterfly?
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Subject:
Engineering -
Author:
pixie32 -
Created:
8 months ago
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What type of cooling tower uses temperature differences inside and outside the stack to facilitate air movement
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Subject:
Engineering -
Author:
уцавампва -
Created:
1 year ago
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Technician A says that electronic conductance testing can determine CCA, state-of-charge, and voltage of the battery. Technician B says that electronic conductance testing determines if there is a bad cell and the battery is not serviceable and should be replaced. Which technician is correct
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Subject:
Engineering -
Author:
Валерия Горбатова -
Created:
8 months ago
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Directions: Correct the errors.
to
1. I went to the library for study last night.
2. Helen borrowed my dictionary for to look up the spelling of "occurred."
3. The teacher opened the window for letting some fresh air in the room.
4. I came to this school for learn English.
5. I traveled to Osaka for to visit my sister.
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Subject:
Engineering -
Author:
baby makergkyg -
Created:
7 months ago
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What is a corporation?
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Subject:
Engineering -
Author:
rubio -
Created:
1 year ago
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Instructions: For each problem, identify the appropriate test statistic to be use (t test or z-test). Then compute z or t value.
1) A teacher claims that the mean score of students in his class is greater than 82 with a standard deviation of 20. If a sample of 81 students was selected with a mean score of 90 then check if there is enough evidence to support this claim at a 0.05 significance level.
2) An online medicine shop claims that the mean delivery time for medicines is less than 120 minutes with a standard deviation of 30 minutes. Is there enough evidence to support this claim at a 0.05 significance level if 49 orders were examined with a mean of 100 minutes?
3) An English teacher wanted to test whether the mean reading speed of students is 550 words per minute. A sample of 12 students revealed a sample mean of 540 words per minute with a standard deviation of 5 words per minute . At 0.05 significance level, is the reading speed different from 550 words per minute?
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Subject:
Engineering -
Author:
daniel73 -
Created:
9 months ago
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It is generally recommended that piercing-type valves be used on what type of tubing materials?
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Subject:
Engineering -
Author:
mauricio1loy -
Created:
1 year ago
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