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A dc transformer is supplied with electric power at 230 watts with an input voltage of 220 volts. The transformer output is 1.9 amps at 110 V. The heat transfer surface area for the transformer can be modeled as a 10 cm x 10 cm x 10 cm cube. The convection heat transfer coefficient for the transformer is hconv=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 air temperature is 25°C. Ans: a1075 amns << 15 gmns

A dc transformer is supplied with electric power at 230 watts with an input voltage of 220 volts. The transformer output is 1.9 amps at 110 V. The heat transfer surface area for the transformer can be modeled as a 10 cm x 10 cm x 10 cm cube. The convection heat transfer coefficient for the transformer is hconv=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 air temperature is 25°C. Ans: a1075 amns << 15 gmns

Refrigeration and Air Conditioning Technology (MindTap Course List)
Refrigeration and Air Conditioning Technology (MindTap Course List)
8th Edition
ISBN:9781305578296
Author:John Tomczyk, Eugene Silberstein, Bill Whitman, Bill Johnson
Publisher:John Tomczyk, Eugene Silberstein, Bill Whitman, Bill Johnson
Chapter42: Heat Gains And Heat Losses In Structures
Section: Chapter Questions
Problem 13RQ: All of the following are taken into account on a heat gain calculation except A. exterior walls. B....
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Problem 23.1 A dc transformer is supplied with electric power at 230 watts with an input voltage of 220 volts. The transformer output is 1.9 amps at 110 V. The heat transfer surface area for the transformer can be modeled as a 10 cm x 10 cm x 10 cm cube. The convection heat transfer coefficient for the transformer is hconv=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 air temperature is 25°C. Ans: a) 0.75 amps ≤ |I| ≤ 1.5 amps b) 15 W ≤ ≤ 25 W c) 90°C ≤ |T| ≤ 100°C (for 5 sides w/ heat transfer)
Transcribed Image Text:Problem 23.1 A dc transformer is supplied with electric power at 230 watts with an input voltage of 220 volts. The transformer output is 1.9 amps at 110 V. The heat transfer surface area for the transformer can be modeled as a 10 cm x 10 cm x 10 cm cube. The convection heat transfer coefficient for the transformer is hconv=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 air temperature is 25°C. Ans: a) 0.75 amps ≤ |I| ≤ 1.5 amps b) 15 W ≤ ≤ 25 W c) 90°C ≤ |T| ≤ 100°C (for 5 sides w/ heat transfer)
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