Q1-A block as sphere made of Teflon initially at a temperature of 90 C is suddenly immersed in a fluid at 20 C. The convection heat- transfer coefficient is 15 W/m2 C. Determine the dimension of the block that it is just considered as lumped-capacity system. Calculate: (1) the time the center of the sphere reaches the half value of initial temperature and, (2) the heat loss from the block at that time.

Q1-A block as sphere made of Teflon initially at a temperature of 90 C is suddenly immersed in a fluid at 20 C. The convection heat- transfer coefficient is 15 W/m2 C. Determine the dimension of the block that it is just considered as lumped-capacity system. Calculate: (1) the time the center of the sphere reaches the half value of initial temperature and, (2) the heat loss from the block at that time.

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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Question

Q1-A block as sphere made of Teflon initially
at a temperature of 90 C is suddenly immersed
in a fluid at 20 C. The convection heat-
transfer coefficient is 15 W/m2 C. Determine
the dimension of the block that it is just
considered as lumped-capacity system.
Calculate :
(1) the time the center of the sphere reaches
the half value of initial temperature and,
(2) the heat loss from the block at that time.

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