Based on the direction of the flow of two hot and cold fluids
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.
Based on mechanical structure and structure
Plate Heat Exchanger
These exchangers consist of several plates or plates connected together. This converter itself is designed in two welded and gasketed models. They use plate converters that are welded in low capacities and washer models in higher capacities. The material of the plate in plate exchangers is stainless steel and consists of channels through which the fluid passes. Steel provides better heat exchange and is highly resistant to corrosion and sedimentation. In plate converters with gaskets, natural rubber or EPDM gaskets are used between the plates, which makes it completely sealed. This converter is used in pool packages to transfer heat to pool water.
Tubular heat exchangers
The tubular heat exchanger is the simplest type of heat exchanger that is used in various industries. This exchanger consists of two concentric tubes, in which cold or hot fluid flows inside, and the other fluid moves in the space between the two tubes. This mode causes heat exchange between the tubes. The above converter is also divided into two categories of opposite or unbalanced current or positive and equal current in terms of current type. These exchangers are used in thermal systems such as packages, and they are the main factor in heat transfer to heaters. Heat exchangers with finned or air-cooled surfaces. Car radiators are an excellent example of The air exchangers are cool. The way this converter works is that the air passes around finned or finned tubes at a high speed and the fluid flowing inside the tubes gives its heat to the ambient air. The fin increases the heat transfer level. These converters are divided into three types: V-shaped, horizontal and vertical.