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 exch
anger is in shell-and tube and the water isflowing through the tubes. The oil makes a single shell pass, entering at 160°C and leaving at 90°C, with an averagedheat transfer coefficient from the oil to the outer wall of the tubes equals 400 W/m^2*K. The water flows through 11 brass tubes of 30 mm diameter with each tube making four passes through the shell.
1. 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.
1. 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.
1 answer:
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Answer:
Explanation:
we have given E(t)=120 sin(12t)
R=5 ohm
L=0.2 H
ω=12 ( from expression of E)
ohm
=5.021 ohm
so amplitude of current =