Garg Lab Solutions

Coil type heat exchangers are all glass design where coil battery is welded directly to glass jacket. This is of importance for plants which have to confirm to GMP requirements since it ensures that product & coolants cannot come in contact with each other. Coil type heat exchangers are mainly used as condensers or coolers. They can also be used for heat tranGSer between liquids & gases. Turbulent flow is ensured even in large bore heat exchangers since coil layers are offset & fill the flow cross section to great extent. Following points should be taken in account while using coil type heat exchangers.

• When connecting coolant lines to coil type condensers; flexible hose or bellow should be used to avoid tranGSer of stresses to the glass

• Use of steam in coil should be avoided.

• Coolant should not be allowed to be heated up to boiling point.

• Coolant control valve should be turned on slowly particularly when air is present in the coils.

• Complete drain of coolant should be allowed.

• Brine can be used in coil in close circuit with suitable precaution against water hammering.

• Vapour should be passed through shell only.

• Maximum pressure of coolant should be 2.7 bar

• Freezing of water in the coil should be avoided.

• Condensers should preferably be mounted in vertical position.

• Heat exchangers should be mounted in series to provide large surface area.

Typical Heat Exchanger Arrangement
 

Technical data

Performance data

The heat tranGSer coefficients also varies from one size of condenser to another but as a guide, the table below given as indication of the performance of condenser at atmospheric pressure, using water (inlet temperature 300°C) as coolant in the coils and steam condensing in the jackets.

The figures do not show the maximum performance of the units but are a general indication of typical working conditions.

The table below shows figures calculated on this basis for the condensation of steam at atmospheric pressure and a cooling water throughput for a maximum pressure drop of 2.5 bar in the coils (inlet temperature 30°C).