g A heat exchanger is designed to is to heat 2,500 kg/h of water from 15 to 80 °C by engine oil. The configuration of the heat e
xchanger is in shell-and tube and the water is flowing through the tubes. The oil makes a single shell pass, entering at 160 °C and leaving at 90 °C, with an averaged heat transfer coefficient from the oil to the outer wall of the tubes equals 400 W/m2·K. The water flows through 11 brass tubes of 30 mm diameter with each tube making four passes through the shell. Assuming fully developed flow for the water inside the tubes, determine the tube length per pass to achieve these specified output temperatures. You may assume the tube wall thickness is negligible in the determination of overall heat transfer coefficient. (
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Answer:
The inductance of the inductor is 0.051H
Explanation:
From Ohm's law;
V = IR .................. 1
The inductor has its internal resistance referred to as the inductive reactance, X, which is the resistance to the flow of current through the inductor.
From equation 1;
V = IX
X =
................ 2
Given that; V = 240V, f = 50Hz, =
, I = 15A, so that;
From equation 2,
X=
= 16Ω
To determine the inductance of the inductor,
X = 2
fL
L =
=
= 0.05091
The inductance of the inductor is 0.051H.