Engineering, 28.09.2020 01:01 sadie271
A fan is to be selected to ventilate a bathroom whose
dimensions are 2 m × 3 m × 3 m. The air velocity is not to
exceed 7 m/s to minimize vibration and noise. The combined
efficiency of the fan–motor unit to be used can be taken to
be 50 percent. If the fan is to replace the entire volume of air
in 15 min, determine (a) the wattage of the fan–motor unit to
be purchased, (b) the diameter of the fan casing, and (c) the
pressure difference across the fan. Take the air density to be
1.25 kg/m3
and disregard the effect of the kinetic energy correction factors.
Answers: 3
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Different types of steels contain different elements that alter the characteristics of the steel. for each of the following elements, explain what the element does when alloyed with steel.
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Ajournal bearing has a journal diameter of 3.250 in with a unilateral tolerance of 20.003 in. the bushing bore has a diameter of 3.256 in and a unilateral tolerance of 0.004 in. the bushing is 2.8 in long and supports a 700-lbf load. the journal speed is 900 rev/min. find the minimum oil film thickness and the maximum film pressure for both sae 20 and sae 20w-30 lubricants, for the tightest assembly if the operating film temperature is 160°f. a computer code is appropriate for solving this problem.
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Engineering, 04.07.2019 18:10
Water at 55c flows across a flat plate whose surface temperature is held constant at 95c. if the temperature gradient at the plate's surface for a given value of x is 18 c/mm, find a) local heat transfer coefficient. b) heat flux
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Engineering, 04.07.2019 18:20
Prove the equivalence between the two statements of the 2nd law of thermodynamics (i.e., a violation of one statement leads to the violatio the other statement)
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A fan is to be selected to ventilate a bathroom whose
dimensions are 2 m × 3 m × 3 m. The air veloc...
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