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Problem 12-1 - Example 12-1 A copper tube is soldered to...

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Example 12-1 A copper tube is soldered to the back of a solar collector, which is maintained at a uniform temperature of 75°C by incident sunlight. Water enters the tube at 25°C with a mass flow rate of 0.011 kg/s. Find the length of tube needed so that the exit temperature is 55°C. Solution: To find the heat transfer coefficient, first find the Reynolds number Re D ρ µ = V x m A ρ = ± V where x A is cross-sectional area Re x Dm A µ = ±
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