etermine the surface tem

Elements Of Electromagnetics
7th Edition
ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
ChapterMA: Math Assessment
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Can anyone help me with this heat transfer question. Just 7-83
d
85°F
20 ft/s
1.5 kW
resistance
heater
FIGURE P7-82E
7-83 A 0.4-W cylindrical electronic component with diam-
eter 0.3 cm and length 1.8 cm and mounted on a circuit board
is cooled by air flowing across it at a velocity of 240 m/min.
If the air temperature is 35°C, determine the surface tempera-
ture of the component. For air properties evaluations, assume a
film temperature of 50°C. Is this a good assumption?
7-84 Consider a 50-cm-diameter and 95-cm-long hot water
tank. The tank is placed on the roof of a house. The water
inside the tank is heated to 80°C by a flat-plate solar collector
during the day. The tank is then exposed to windy air at 18°C
Transcribed Image Text:d 85°F 20 ft/s 1.5 kW resistance heater FIGURE P7-82E 7-83 A 0.4-W cylindrical electronic component with diam- eter 0.3 cm and length 1.8 cm and mounted on a circuit board is cooled by air flowing across it at a velocity of 240 m/min. If the air temperature is 35°C, determine the surface tempera- ture of the component. For air properties evaluations, assume a film temperature of 50°C. Is this a good assumption? 7-84 Consider a 50-cm-diameter and 95-cm-long hot water tank. The tank is placed on the roof of a house. The water inside the tank is heated to 80°C by a flat-plate solar collector during the day. The tank is then exposed to windy air at 18°C
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