Heat exchangers made from two metal sheets that are welded together to form a series of passages are shell and tube type heat exchanger evaporators.
There are gaskets between every component in a plate heat exchanger, making that component weak and vulnerable to leakage. Shell and tube heat exchangers don't have this issue.
The shell and tube type can be used in evaporation, where liquids transform into vapors and create a quick shift in pressure, whereas the plate type cannot be used since there is a risk of leaking when there is a high temperature and high pressure drop.
Thus, it is a shell and tube type heat exchanger.
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