What is the role of the baffles in a shell-and-tube heat exchanger? How does the presence of baffles affect the heat transfer and the pumping power requirements? Explain.
What will be an ideal response?
In the shell and tube exchangers, baffles are commonly placed in the shell to force the shell side fluid to flow across the shell to enhance heat transfer and to maintain uniform spacing between the tubes. Baffles disrupt the flow of fluid, and an increased pumping power will be needed to maintain flow. On the other hand, baffles eliminate dead spots and increase heat transfer rate.
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a. Megohmmeter b. Voltage tester c. Continuity tester d. Clamp-on ammeter
A menos que se indique de otro modo, los cálculos en circuitos de CA generalmente utilizan valores______.
a. de pico b. promedio c. de fase d. rms
How long will it take a 0.047 ?F capacitor to fully charge through a 100 k? resistor?
A) 2.35 s B) 235 ms C) 0.235 ms D) 23.5 ms
How is a smoke candle used when troubleshooting an open display case?
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