Question: Consider the water pipe treated in Example 7.7.4. Suppose now that the water is not flowing. The water is initially at 120oF. The copper pipe

Consider the water pipe treated in Example 7.7.4. Suppose now that the water is not flowing. The water is initially at 120oF. The copper pipe is 6 ft long, with inner and outer radii of 1 /4 in. and 3/8 in. The temperature of the surrounding air is constant at 70°F. Neglect heat loss from the ends of the pipe, and use the following values. For copper, k = 50 lb/sec-oF. The convection coefficient at the inner surface between the water and the copper is now different because the water is standing. Use hi, = 6 lb/sec-ft-°F. The convection coefficient at the outer surface between the air and the copper is ho =1.1 lb/sec-ft-°F. Develop and solve a dynamic model of the water temperature T(t) as a function of time.

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The thermal energy E of the water in the pipe is E mc p T i r 2 i L c p T i 148 2 61942... View full answer

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