Problem 23.1A dc transformer is supplied with electric power at 230 watts with an input voltage of 220 volts. Thetransformer output is 1.9 amps at 110 V. The heat transfer surface area for the transformer can bemodeled as a 10 cm x 10 cm x 10 cm cube. The convection heat transfer coefficient for the transformer ishconv=6 W/m².K.(a) Determine the input current to the transformer, in amps.(b) Determine the rate of heat transfer from the transformer at steady-state operation conditions,in W.(c) Determine the steady-state surface temperature of the transformer if the ambient airtemperature is 25°C.Ans: a) 0.75 amps ≤ |I| ≤ 1.5 ampsb) 15 W ≤ ≤ 25 Wc) 90°C ≤ |T| ≤ 100°C (for 5 sides w/ heat transfer)

Answered: Image /qna-images/answer/98166fc4-7d57-4219-a1ef-028a132e1759.jpg

Answered: A dc transformer is supplied with…

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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Steam at 140 ° C flows in a pipe having an inner radius of 50 mm and an outer radius of 55 mm. The convective heat transfer coefficient between the steam and the inner pipe wall is 2500 W / (m² ° C). The outer surface of the pipe exposed to ambient air is 20 ° C with a convective heat transfer coefficient of 10 W / (m² ° C). Assuming steady state, calculate the rate of heat transfer per meter of pipe from steam to air. Assume that the thermal conductivity of stainless steel is 15 W / (m ° C.). Steps of work according to example 4.16 Singh. a. Find the overall heat transfer coefficient = Answer W / m² ° C. b. Heat transfer rate per meter of pipe = Answer W / m.
IP Heat Transport in the Human Body The core temperature of the human body is 37.0 ∘C∘C, and the skin, with a surface area of 1.40 m2m2, has a temperature of 34.0 ∘C∘C. Find the rate of heat transfer out of the body under the following assumptions: (i) The average thickness of tissue between the core and the skin is 1.20 cmcm; (ii) the thermal conductivity of the tissue is that of water. Express your answer using two significant figures. Without repeating the calculation of part A, what rate of heat transfer would you expect if the skin temperature were to fall to 31.0 ∘C∘C? Express your answer using two significant figures.
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