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Q3) A 1200-W iron is left on the ironing board with its base exposed to the air. About 85 percent of the heat generated in the iron is dissipated through its base whose surface area is 150 cm², and the remaining 10 percent through other surfaces. Assuming the heat transfer from the surface to be uniform, determine (a) the amount of heat the iron dissipates during a 2-hour period, in kWh, (b) the heat flux on the surface of the iron base, in W/m², and (c) the total cost of the electrical energy consumed during this 2-hour period. Take the unit cost of electricity to be $ 0.07/kWh. Ans: (a) 2.4 kWh (b) 72 kW/m² (c) $ 0.17

Q3) A 1200-W iron is left on the ironing board with its base exposed to the air. About 85 percent of the heat generated in the iron is dissipated through its base whose surface area is 150 cm², and the remaining 10 percent through other surfaces. Assuming the heat transfer from the surface to be uniform, determine (a) the amount of heat the iron dissipates during a 2-hour period, in kWh, (b) the heat flux on the surface of the iron base, in W/m², and (c) the total cost of the electrical energy consumed during this 2-hour period. Take the unit cost of electricity to be $ 0.07/kWh. Ans: (a) 2.4 kWh (b) 72 kW/m² (c) $ 0.17

Principles of Heat Transfer (Activate Learning with these NEW titles from Engineering!)
Principles of Heat Transfer (Activate Learning with these NEW titles from Engineering!)
8th Edition
ISBN:9781305387102
Author:Kreith, Frank; Manglik, Raj M.
Publisher:Kreith, Frank; Manglik, Raj M.
Chapter2: Steady Heat Conduction
Section: Chapter Questions
Problem 2.39P: The tip of a soldering iron consists of a 0.6-cm- diameter copper rod, 7.6 cm long. If the tip must...
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Q3) A 1200-W iron is left on the ironing board with its base exposed to the air. About 85 percent of the heat generated in the iron is dissipated through its base whose surface area is 150 cm², and the remaining 10 percent through other surfaces. Assuming the heat transfer from the surface to be uniform, determine (a) the amount of heat the iron dissipates during a 2-hour period, in kWh, (b) the heat flux on the surface of the iron base, in W/m², and (c) the total cost of the electrical energy consumed during this 2-hour period. Take the unit cost of electricity to be $ 0.07/kWh. Ans: (a) 2.4 kWh (b) 72 kW/ m² (c) $ 0.17
Transcribed Image Text:Q3) A 1200-W iron is left on the ironing board with its base exposed to the air. About 85 percent of the heat generated in the iron is dissipated through its base whose surface area is 150 cm², and the remaining 10 percent through other surfaces. Assuming the heat transfer from the surface to be uniform, determine (a) the amount of heat the iron dissipates during a 2-hour period, in kWh, (b) the heat flux on the surface of the iron base, in W/m², and (c) the total cost of the electrical energy consumed during this 2-hour period. Take the unit cost of electricity to be $ 0.07/kWh. Ans: (a) 2.4 kWh (b) 72 kW/ m² (c) $ 0.17
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