An air-cooled IC engine can be approximated as a cube of size 0.2 m x 0.2 m x 0.2 m and made of cast iron with ak = 60 W/mK, as shown in Fig. Q4. Four sides of the cube are used to reject heat to the atmosphere. To improve the heat transfer, 10 straight triangular fins are attached to each side. The fins have a thickness of 10 mm and a length of 20 mm and run horizontally along each size. You may ignore the top and bottom surfaces. The ambient air temperature is 30 °C and the heat transfer coefficient is h = 68 W/m2K. The temperature of the engine walls (at the base of the fins) is measured to be 230 °C. 0.2 m 0.02 m 0.01 m Fig. Q4: An approximate cube-shaped IC engine. a) Calculate the rate of heat loss by convection from the four sides of the engine to the ambient air if there were no fins present. b) Using the data in the formula sheet determine the efficiency of a single straight triangular fin c) Calculate the heat transfer rate for a single fin using the efficiency from part b. d) Calculate the total heat loss from all four sides of the engine in finned configuration.

An air-cooled IC engine can be approximated as a cube of size 0.2 m x 0.2 m x 0.2 m and made of cast iron with ak = 60 W/mK, as shown in Fig. Q4. Four sides of the cube are used to reject heat to the atmosphere. To improve the heat transfer, 10 straight triangular fins are attached to each side. The fins have a thickness of 10 mm and a length of 20 mm and run horizontally along each size. You may ignore the top and bottom surfaces. The ambient air temperature is 30 °C and the heat transfer coefficient is h = 68 W/m2K. The temperature of the engine walls (at the base of the fins) is measured to be 230 °C. 0.2 m 0.02 m 0.01 m Fig. Q4: An approximate cube-shaped IC engine. a) Calculate the rate of heat loss by convection from the four sides of the engine to the ambient air if there were no fins present. b) Using the data in the formula sheet determine the efficiency of a single straight triangular fin c) Calculate the heat transfer rate for a single fin using the efficiency from part b. d) Calculate the total heat loss from all four sides of the engine in finned configuration.

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

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Entropy

In physics, entropy means the amount of disorder or the degree of randomness associated with a thermodynamic system. The system is not self-organized when the entropy of the system is high. For instance, when a system is at an elevated temperature, its molecules are in random motion, vibrating and colliding with each other. During this scenario, the probability of finding a molecule at a particular place twice, is low. Under this circumstance, the system can be said to be in a high entropy.

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