Fluids mixing in plate heat exchangers can only occur if a plate brakes for corrosion or cracking, not due to gaskets breaking, due to double protection and leakage alert they ensure.
Swapping the primary and secondary circuit and reversing the flows in plate heat exchangers is usually possibile, with some exceptions. So that’s why it’s always better to ask for it in advance.
Shell and tube heat exchangers in cogeneration plants for heat recovery applications on exhaust at high temperatures coming from endothermic engines.
Why do you need H or L plates in a plate heat exchanger? Different pressure drop and heat transfer coefficient depending on different kind of plate.
First Tempco video tutorial dedicated to plate heat exchangers and their advantages in terms of flexibility, higher heat transfer efficiency and compact design.