How to perform design calculations for direct cooling in HTFS
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The system is planned to use direct cooling for heat exchange; the hot fluid flows inside the tubes and is in gaseous state with condensation occurring, while R23 in gas-liquid phase flows in the shell side. How should the heat exchanger be designed? Please give me some advice
Additional note: No difference from regular design. It is not direct mixed cooling.
The main issue is that it is difficult to determine the inlet and outlet conditions of R23, as it may enter the heat exchanger in a gas-liquid form; in this case, the liquid fraction might be high. After evaporation within the heat exchanger, the vast majority of it turns into a gaseous state and exits the heat exchanger, but some liquid R23 may still remain at the bottom of the vertical heat exchanger. In this way, since the gas phase separation at the inlet and outlet differs, how can the heat transfer coefficient of the shell side be determined? Please give me some advice!
With HTFS 2006+, by simply entering the process parameters for imported and exported materials, the system can handle it on its own.
It’s difficult to determine the state of Freon in the shell side; how can the vapor fraction of the cold stream be determined?