Different types of heat exchangers
Different types of heat exchangers are available on the market, manufactured according to the needs with different solutions that can vary depending on the sector.
The simplest and most common heat exchanger is the two-tube heat exchanger, which consists of two concentric tubes of different diameters: the first fluid circulates in the smaller-diameter tube, while the second fluid circulates in an annular channel between the two tubes. There are two types of flow: cocurrent (when liquids move in the same direction) or counter current (when liquids move in opposite directions).
shell and tube heat exchanger is the most commonly used model in industrial applications. This type of heat exchanger is characterized by a large number of tubes (it can even be several hundred) and a cylindrical cover that houses them.
plate heat exchanger consists of metal plates with holes that allow liquids to flow through small channels. Its peculiarity lies in the fact that the plate surfaces alternately come into contact with hot and cold liquids.
Regenerative heat exchanger allows hot and cold fluids to circulate alternately like a plate heat exchanger. However, there is a difference between static and dynamic. The regenerative static heat exchanger has a high thermal capacity and a porous structure characterized by a grid of ceramic material wires.A dynamic regenerative heat exchanger, on the other hand, allows for a continuous flow of hot and cold fluids and consists of a rotating drum that alternately contacts the two fluids as it rotates, acting as a useful store of thermal energy.
All of these heat exchangers can be very efficient. However, over time, the situation may change, as materials of various types accumulate in the walls, which create resistance during the heat exchange process and reduce its efficiency. However, with proper regular maintenance, this may not be the case as the equipment still needs to be cleaned and inspected by qualified professionals to remain safe and effective for years to come.