Coil type heat exchangers are mainly used as condensers, coolers, or re-boilers, apart from the general heat transfer function between two fluids at different temperatures. It is usually made of two components an outer jacket and an inner coil battery, which are welded together to make a one-piece unit.
Condensers:
Coil type condensers are used for condensation of vapors and cooling of liquids. These are made by fusing a number of parallel coils in a glass shell. Coils are made in different concentric diameters using tubes of different nominal bores.
Usually, the coolant flows through the coils while the vapor flows through the jacket. Condensers with heat transfer area (HTA) up to 8m2 are readily available. Usually, it is accompanied by a reflux divider to ensure a complete collection of the distillate.
Depending on the nature of the fluid through the jacket, the average heat transfer coefficient can be considered as per the table below.
| Jacket side Media | Coil Side media | Heat Transfer Co-eff.(in Kcal/m2,Hr,°C) |
|---|---|---|
| Vapour | Liquid | Gas |
| Cooling Water | Cooling Water | Cooling Water |
| 200-270 | 100-150 | 40-50 |
Product Coolers:
It is used to extract active ingredients from solids using a solvent as a medium. The solid is placed in the extraction vessel through which the pre-heated solvent passes. The solvent is so chosen that the active ingredient gets passes on into the solvent, leaving behind the solid material.
The solvent is then recovered using different techniques such as distillation, leaving behind the active ingredient. The recovered solvent can be reused in the same process.
Boilers:
Boilers are used for the vaporization of the product fluid. Like condensers, the boiler also contains a number of parallel coils fused together in a glass shell. However, the cross-sectional area in the shell side is bigger in the boiler as compared to a condenser. With the steam flowing through the coils, this results in effectively higher heat transfer. The heat transfer can be considered as 300kcal/ m2, Hr,°C on an average at a steam pressure of 3 bar in the coils.
Immersion Heat Exchangers:
Immersion heat exchangers are used to control exothermic reactions in glass vessels. They can be used with spherical vessels with a large bottom outlet or with cylindrical vessels with a nominal size bottom outlet. Cooling water or steam is used in coils.
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+91-9820024530
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