Two heat exchangers are under consideration for purchase. A standard type of heat exchanger (code name HX1) has an initial insta
lled cost of $20,000 and a useful life of 6 years. At the end of its useful life, the standard heat exchanger has a negligible salvage value, assumed to be 0. Another type of heat exchanger (Code name HX2) with equivalent design capacity has an initial installed cost of $34,000, and a useful life of 10 years with a salvage value of $4,000. Assuming an effective interest rate of 6% per year, determine which heat exchanger will heat exchanger will result in the lower capitalized cost.
1 answer:
Answer:
The lower capitalized cost is associated with HX1
Explanation:
The capitalized cost is basically the present cost. Therefore, for the Heat Exchanger HX1, the capitalized cost will be:
CC1 = First Cost
<u>CC1 = - $ 20,000</u>
Negative sign shows cash outflow.
Now, for Heat Exchanger HX2, we have:
CC2 = - $ 34,000 + ($ 4,000)(P/F, 6%, 10)
Now, we use the factor tables to calculate the present worth (P) of the salvage value, which is actually future worth, after 10 years at a compounded interest of 6% per year.
The factor table is provided in picture, with the value indicated.
CC2 = - $ 34,000 + ($ 4,000)(0.5584)
CC2 = - $ 34,000 + $ 2,233.6
<u>CC2 = - $ 31,766.4</u>
From the capitalized cost, taking look at the absolute values of both heat exchangers we can conclude that:
<u>The Heat Exchanger that will result in lower capitalized cost is HX1</u>
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The hydrofoil boat has an A-36 steel propeller shaft that is 100 ft long. It is connected to an in-line diesel engine that delivers a maximum power of 2590 hp and causes the shaft to rotate at 1700 rpm . If the outer diameter of the shaft is 8 in. and the wall thickness is in.
A) Determine the maximum shear stress developed in the shaft.
= ?
B) Also, what is the "wind up," or angle of twist in the shaft at full power?
= ?
Solution :
Given :
Angular speed, ω = 1700 rpm
Power
= 1424500 ft. lb/s
Torque,
= 8001.27 lb.ft
A). Therefore, maximum shear stress is given by :
Applying the torsion formula
= 2.93 ksi
B). Angle of twist :
= 0.08002 rad
= 4.58°
Answer:
a)
b)
c)
Explanation:
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But we know the work is equal to change of kinetic energy, so:
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At the maximum height the velocity is 0, so v(f) = 0.
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Using the same equation of part b)
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I hope it helps you!