Hot water at average temperature of 90°C is flowing through a cast iron pipe (k=40 W/mK) whose inner and outer diameters are 3 cm and 4.5 cm, respectively. The pipe is insulated with 3 cm thick fiberglass insulation (k=0.04 W/mK). The outer surface of the pipe is exposed to the air at 20°C in the basement, with a heat transfer coefficient of 20 W/m²K . The heat transfer coefficient at the inner surface of the pipe is 100 W/m2K. What is the inner surface temperature? E a. 38 °C O b. 88 °C O c. 79 °C O d. 13 °C O e. 23 °C

Hot water at average temperature of 90°C is flowing through a cast iron pipe (k=40 W/mK) whose inner and outer diameters are 3 cm and 4.5 cm, respectively. The pipe is insulated with 3 cm thick fiberglass insulation (k=0.04 W/mK). The outer surface of the pipe is exposed to the air at 20°C in the basement, with a heat transfer coefficient of 20 W/m²K . The heat transfer coefficient at the inner surface of the pipe is 100 W/m2K. What is the inner surface temperature? E a. 38 °C O b. 88 °C O c. 79 °C O d. 13 °C O e. 23 °C

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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Concept explainers

Conduction and Convection

When energy travels from one object to another it is said to have undergone heat transfer. Heat transfer is nothing but the transfer of thermal energy or internal energy from one thing to another, like e.g., when a vessel with water, kept on top of a burner, heats up because of the flame underneath it.

Question

Hot water at average temperature of 90°C is flowing through a cast iron pipe (k=40 W/mK) whose inner and outer diameters are 3 cm and 4.5 cm, respectively. The pipe is insulated with 3
cm thick fiberglass insulation (k=0.04 W/mK). The outer surface of the pipe is exposed to the air at 20°C in the basement, with a heat transfer coefficient of 20 W/m?K. The heat transfer
coefficient at the inner surface of the pipe is 100 w/m2K. What is the inner surface temperature?
O a. 38 °C
O b. 88 °C
O c. 79 °C
O d. 13 °C
O e. 23 °C
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