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immersion heat exchangers are used to control exothermic reactions in glass vessels. In most applications cooling water is used in the coils, but they can also be used with steam. In the latter case, the coils must always be completely immersed in the liquid
The HEM 6 is used in our type R spherical vessels and the HEM 9 in type E vessels. They can also be used in cylindrical vessels with special 6" or 9" bottom outlets.
The HEM 9 has a central hole through the coil to which the extended type stirrer shaft can be fitted to provide thorough mixing action.
These values may be used to approximate the overall heat transfer coefficients and the maximum allowable thermal shock for both the HEM 6 and HEM 9.
| Heat Transfer Co efficient (Btu/hr - ft2 - °F) | Maximum Thermal Shock |
|
| Cooling, with agitation | 40 - 50 | 125°F |
| Cooling, without agitation | 20 - 30 | 180°F |
| Heating, with agitation | 60 - 70 | 105°F |
| Heating, without agitation | 40 - 50 | 125°F |