Regarding the calculation issues of ammonia evaporators
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The cold stream is ammonia, at 1.5 bar and -25 degrees Celsius, in liquid form; the hot stream is carbon dioxide, at -6 degrees Celsius, also in liquid form. The product carbon dioxide is cooled to -20 degrees. Liquid ammonia comes from the ammonia separator; both the ammonia separator and the evaporator are vertical. The evaporator is of BEM type, with ammonia flowing in the tube side. (1) Can the installation height be calculated using TASC? (2) Is it appropriate to choose a heat exchanger with DN400 and a pipe length of 4m? (3) If a friend has calculated it using TASC, can they upload the calculation program? Thank you. I calculated it using PROII. User Input Calculated ---------- ---------- Shell Outlet Temp, C -20.00 -20.00 Tube Outlet Temp, C -25 Duty, M*WATT 0.0598 U, KW/M2-K N/A 0.2830 Total Installed Area, M2 45.17 20.50
The carbon dioxide pressure is 30 bar. This post was last edited by Hongzao on 2009-4-4 at 18:53.]
Today, I finally got the program to work using TASC. But some details still need to be combined with reality. Celebrate by yourself first.