Shell and coil

Shell and coil heat exchangers consist of a shell and a helical coil inside. The typical configuration of these heat exchangers includes an external cylindrical container, called shell, and one or more coils placed in it. The coils are made by different spiral wound tubes, that may be concentric or aligned along the same axis, connected to each other in series or parallel. The real advantage of this technology are:
- Reduced axial dimensions, a wound tube takes up less space than a straight pipe of equal length;
- Ease of implementation, which help to reduce the costs;
- Less fouling: the coil counteracts the deposition of impurity presented in the fluid, allowing them faster evacuation by the convection currents in the shell. The sediments tend to accumulate at the bottom and not on the pipes; this will reduce the maintenance and the heat exchanger remains efficient for longer time periods;
- Easy to clean: for the same reasons listed above the heat exchanger cleaning is facilitated;
- Ability to have several outputs at different temperatures on the shell: if placed in an upright position, and for large enough heat exchangers the phenomena of stratification occurs, just like it occurs in a boiler where depending on the height at which the temperature is measured, the fluid can exit at different temperatures.

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