Answer:
Concentric tubes or double tube.
Casing and tubes.
Plates.
Explanation:
There are two classify of heat exchange:
1) Direct contact heat exchanger: the exchange heat is produced by the mixture betweenn two fluids, for example refrigeration towers.
2) Indirect contact heat exchange: the fluids never mix, and exchange the heat across a surface.
For example:
Concentric tubes or double tube: the fluid travel trough the central tube, and in the extern tube (bigger diameter) have other fluir with a different tempreature which can give o became the heat of the central fluid.
Casing and tubes are used in Industries, which have a lot of tube inside tha casing.
Plates: the fluid travel throug the metal plates.
