Based on geometry of construction, heat exchanger can be classified to three major construction types: Tubular, Plate and Extened surface heat exchangers.
1. Tubular Heat Exchangers
Tubular heat exchanger are built of circular tubes, One fluid flows inside the tubes and the other flows on the outside of the tubes. Tube diameter, the number of tubes, the tube length, the pitch of the tubes, and the tube arrangement can be changed, Therefore, there is considerable flexibility in their design.
2.Plate Heat Exchangers
Plate heat exchangers are built of thin plate forming flow channels. The fuid streams are seperated by the plates which are smooth or between which lie corrugated fins. Plate heat exchangers are used for transfering heat for any combinations of gas, liquid and two-phase streams.
3.Extended Surface Heat Exchangers
Extended surface heat exchangers are devices with fins or appendages on the primary heat transfer surface with the object of increasing heat transfer area. As it is well known that the heat transfer coefficient on gas side is much lower than those on the liquid side, finned heat transfer surfaces are used on the gas side to increase the heat transfer area. Fins are widely used in gas-to-gas and gas to liquid heat exchangers whenever the heat transfer coefficient on one or both side is low and there is a need for a compact heat exchanger.
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