Heat exchangers are the sub devices used for exchanging the heat, as its names suggests. It transfers the heat efficiently from one medium to another. Heat exchangers are generally used in all the devices which can control temperature and humidity of a proper volume space. For example, these are used in chemical and power plants, natural gas processing, in refrigeration, air conditioning or you can say in HVAC industries.
There are many types of heat exchangers depending upon the shells, tubes, wheels, plates and fluid used in them. Few of them are:
Adiabatic wheel type: This type of heat exchanger uses a transitional fluid or solid to store the heat and has the capability of absorbing the heat. Further, the heat stored in transitional state’s fluid or solid moves to the other side of heat exchanger for releasing it.
Examples: Cold fluid adiabatic wheels heat exchangers have a large wheel that consists of threads and these fine threads are rotated by heat.
Plate fin type: This type of exchangers has the passages which are sandwiched in between. And passages consist of fins. These fins are responsible for more efficiency. The fins have several shapes like offset fin, wavy fins and straight fins.
The fins and plates need to have higher heat transfer rate, so they are made up of metal alloys such as aluminum which makes them more effective.
High heat transmission, resisting extreme pressure, huge amount of heat transfer and lighter in weight are a few advantages of plate fin type heat exchangers.
Shell and tube: This type of heat exchangers contains sequences of PEX tubes or pipe like bodies. And these tubes are filled with fluid which acts as heat transferring medium. The other tubes used in this may have some different fluid. The second fluid surrounds the tubes which are facing the thermal conditions such as cooling or heating.
Main advantage of this type of heat exchangers is that they can resist very high pressure, around or more than 30 bars. The shape of this heat exchanger is also responsible for resisting high pressure.
Plate type: This is further divided into categories depending upon the number of plates and their gaps between each other. Plate type heat exchangers are used widely in HVAC applications. These are also called as Plate and Frame type heat exchangers. The plate’s arrangements such as number of plates and gap in between them are interrelated with the efficiency of heat absorbing and transferring.
Fluid type: This is the most widely used type of heat exchangers. These are more economical than others. Espresso machines are the most common, which use this type of heat exchangers. In fluid heat exchanger’s process, two simultaneously process are held which improves its working efficiency.
Spiral type: As the name suggests, the shape of these types of heat exchangers is spiral or helical because they look like coils and have different sheets. Whole heat exchanger is divided into channels in which few channels act as reservoir of fluid which exchanges the heat.