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The commonly used water heating is a simple casing heat exchanger

The sleeve type heat exchanger is a concentric sleeve made of straight tubes of different diameters and connected by a U-shaped elbow. Because the fluid flow rate outside the tube is large. The cold and hot fluids can be used as pure countercurrent, so the heat transfer coefficient is large and the heat transfer effect is good. The commonly used water heating is a simple casing heat exchanger.

Shell and tube heat exchanger

Shell-and-tube (also known as tube-and-tube) heat exchangers are the most typical type of wall-mounted heat exchangers. They have a long history in industrial applications and still dominate the heat exchangers.

The shell-and-tube heat exchanger mainly consists of a casing, a tube bundle, a tube sheet and a head. The shell is mostly circular, and a parallel tube bundle is arranged inside, and the tube bundle is fixed on the tube plate at both ends.

Two kinds of fluids that exchange heat in a shell-and-tube heat exchanger, one flowing in the tube, the stroke is called the tube path; and the other is flowing outside the tube, and the stroke is called the shell side. The wall surface of the tube bundle is the heat transfer surface.

In order to increase the heat transfer coefficient of the fluid outside the pipe, a certain number of transverse baffles are usually installed in the casing.

The baffle baffle not only prevents fluid short circuit, increases fluid velocity, but also forces the fluid to flow through the tube bundle multiple times in a prescribed path, so that the degree of turbulence is greatly increased. Commonly used baffles are rounded and disc shaped, the former is more widely used.