Perhaps I wasn't very clear with the problem statement either.
Hot fluid is process condensate, enters from top nozzle
Cooling water is cold fluid, enters from bottom nozzles
Now hot condensate should enter from left side of the exchanger as per data sheet of HX i.e. inlet of process...
Are hot and cold sides of plate type heat exchangers interchangeable? as per manufacturer's data sheet the hot and cold (inlet/ outlet)nozzles are marked but they don't match the field orientation i.e. the left and right side nozzles are swapped. is it advisable that we install them in as-is...