Counterflow exchangers: Cold and hot fluid in this type of heat exchanger are parallel but in opposite directions. In these converters, it is possible to increase the temperature of the outgoing cold fluid compared to the outgoing hot fluid. The above converters generally have a lower contact surface than other parallel converters.

Parallel flow or co-directional flow converters: Cold and hot currents in this Converters are in parallel and agree with each other; This means that it is in one direction and enters the converter from one side and exits from the other side. An important point to mention is that the temperature of the cold fluid coming out of the converter is not the same temperature as the heated fluid. , cold and hot currents are perpendicular to each other. The most obvious example of these converters is related to the car radiator.

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