2. Circular (or annular) fins are employed around the cylinder of a lawn mower engine to dissipate heat. The aluminum fins are 0.3cm thick and extend 2 cm from the base to tip. The outside diameter of the engine cylinder is 0.3m. Design operating conditions are Too =30C, h=12W/m2K and k=46.4W/mK. The maximum allowable cylinder temperature is 300C. Estimate the amount of heat transfer from a single fin. How many fins are required to cool a 3-kW engine, operating at 30% thermal efficiency, if 50% of the total heat given off is transferred by the fins. You may use the following figure 3.20 for your calculations:
2. Circular (or annular) fins are employed around the cylinder of a lawn mower engine to dissipate heat. The aluminum fins are 0.3cm thick and extend 2 cm from the base to tip. The outside diameter of the engine cylinder is 0.3m. Design operating conditions are Too =30C, h=12W/m2K and k=46.4W/mK. The maximum allowable cylinder temperature is 300C. Estimate the amount of heat transfer from a single fin. How many fins are required to cool a 3-kW engine, operating at 30% thermal efficiency, if 50% of the total heat given off is transferred by the fins. You may use the following figure 3.20 for your calculations:
Introduction to Chemical Engineering Thermodynamics
8th Edition
ISBN:9781259696527
Author:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Publisher:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Chapter1: Introduction
Section: Chapter Questions
Problem 1.1P
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Transcribed Image Text:2. Circular (or annular) fins are employed around the cylinder of a
lawn mower engine to dissipate heat. The aluminum fins are 0.3cm
thick and extend 2 cm from the base to tip. The outside diameter of
the engine cylinder is 0.3m. Design operating conditions are To
=30C, h=12W/m2K and k=46.4W/mK. The maximum allowable
cylinder temperature is 300C. Estimate the amount of heat transfer
from a single fin. How many fins are required to cool a 3-kW engine,
operating at 30% thermal efficiency, if 50% of the total heat given off
is transferred by the fins. You may use the following figure 3.20 for
your calculations:
100
80
60
40
20
A, = 4t
0.5
1.0
1.5
2.0
2.5
FIGURE 3.20 Efficiency of annular fins of rectangular profile.
(%)L
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