A pin fin of uniform cross-sectional area is fabricated of an aluminum alloy (k = 160W m-1 K-1 ). The fin diameter is D = 4 mm,
and the fin is exposed to convective conditions characterized by h = 220W m-2 K-1 . It is reported that the fin efficiency is ?f = 0.65. Account for convection heat transfer at the fin tip.
Questions: (a) What is the length of the fin, L?
(b) What is the fin effectiveness ?f?
Questions: (a) What is the length of the fin, L?
(b) What is the fin effectiveness ?f?
1 answer:
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Answer:
It's indeed safer to suggest a 150 VA transformer. Following table however is the clarification given.
Explanation:
For 2 motors with 0.1 A, the Power will be:
P =
=
For 4 motors with 0.18 A, the Power will be:
P =
=
As we know, for 6 pilot lamps, the power is "5 W".
So,
The total power will be:
⇒ P =
=
Now,
Consider the power factor to be "0.95"
VA of transformer is:
=
=
=
Answer:
106600 btu/s
<u>note: </u>
<u><em> solution is attached due to error in mathematical equation. please find the attachment</em></u>
