Heat exchange pipe in! Challenging problem!?
Problem: Pipe-length necessary to cool the ammonia of 10 degrees and 4 degrees inside the pipe. Given: - The exterior of the pipe is surrounded by water of constant temperature 4 Rank - mass flow of ammonia is 200kg / s-specific heat of ammonia 4.52 kJ / kg.K heat - specific water 4187 kJ / kgK - pipe is 1m in diameter and 5mm thick. - Aluminum Pipe has a thermal conductivity of 237 m * W-1 • K-1
I did not notice before you want to cool the ammonia exactly the water temperature, 4 º C. Can 't be done. Two objects of different temperature reach a common temperature exponentially, ie, they never reach equilibrium. Therefore, the ammonia will never to 4 º C. Perhaps 4.1 º C, but it would take considerable time and a very long hose. 4.01 º C would take probably 10 times longer ..
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