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℃ by a flat-plate solar collector during the day. The tank is then exposed to windy air at 18℃ with an average velocity of 40 km/h during the night. Estimate the temperature of the tank after a 45-min period. Assume the tank surface to be at the same temperature as the water inside, and the heat transfer coefficient on the top and bottom surfaces to be the same as that on the side surface. Evaluate the air properties at 50℃. (Answer: 69.9 ℃)
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℃ by a flat-plate solar collector during the day. The tank is then exposed to windy air at 18℃ with an average velocity of 40 km/h during the night. Estimate the temperature of the tank after a 45-min period. Assume the tank surface to be at the same temperature as the water inside, and the heat transfer coefficient on the top and bottom surfaces to be the same as that on the side surface. Evaluate the air properties at 50℃. (Answer: 69.9 ℃)
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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Question
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℃ by a flat-plate solar collector during the
day. The tank is then exposed to windy air at 18℃ with an average velocity of 40 km/h during
the night. Estimate the temperature of the tank after a 45-min period. Assume the tank surface
to be at the same temperature as the water inside, and the heat transfer coefficient on the top
and bottom surfaces to be the same as that on the side surface. Evaluate the air properties at
50℃. (Answer: 69.9 ℃)
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