These are heat exchanging apparatuses intended both to cool and to preheat various fluids.

They have specific constructions, by which it is possible to be groupped, as follows:

  1. Heat exchangers TKH type-shell-and-tube construction with fixed tube plates and straight heat exchanging tubes.
  2. Heat exchangers KC tupe shell – and – tube construction in which the heat exchanging tubes are wound on serpentines.
  3. Heat exchangers СТТ type-construction consist of tube in tube wound on a serpentines.
  4. Heat exchangers KC8 type – it is not suitable to operate with sea and fresh water 

The termal engineering and hydrodynamic characteristics depend on the parameters of the system in which they are included.