A long copper (k = 200 W/m-K) tube has an inner radius o Refrigerant flows through the pipe. The temperature of the transfer coefficient on the inside of the pipe is 150 W/m²-k the ambient air at 25°C. The air is stagnant and the heat tra the pipe is 5 W/m²-K. (a) Find the heat gain rate (per unit length) from the ai (b) The first assignment a mechanical engineer gets aft School of Mines is to find a way to reduce the heat is to wrap the pipe with a 6-mm-thick layer of insul
A long copper (k = 200 W/m-K) tube has an inner radius o Refrigerant flows through the pipe. The temperature of the transfer coefficient on the inside of the pipe is 150 W/m²-k the ambient air at 25°C. The air is stagnant and the heat tra the pipe is 5 W/m²-K. (a) Find the heat gain rate (per unit length) from the ai (b) The first assignment a mechanical engineer gets aft School of Mines is to find a way to reduce the heat is to wrap the pipe with a 6-mm-thick layer of insul
Elements Of Electromagnetics
7th Edition
ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
ChapterMA: Math Assessment
Section: Chapter Questions
Problem 1.1MA
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Transcribed Image Text:A long copper (k = 200 W/m-K) tube has an inner radius of 6 mm and an outer radius of 7 mm.
Refrigerant flows through the pipe. The temperature of the refrigerant is 5°C and the heat
transfer coefficient on the inside of the pipe is 150 W/m²-K. The outside of the pipe is open to
the ambient air at 25°C. The air is stagnant and the heat transfer coefficient on the outside of
the pipe is 5 W/m²-K.
(a) Find the heat gain rate (per unit length) from the air to the refrigerant.
(b) The first assignment a mechanical engineer gets after graduating from the South Dakota
School of Mines is to find a way to reduce the heat gain of the refrigerant. Her solution
is to wrap the pipe with a 6-mm-thick layer of insulation with conductivity 0.065 W/m-K.
Calculate the new heat gain rate (per unit length). Explain your result.
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