Table 1.5. Constants used to calculate the tube bundle diameter.

Figure 1.11 . Kettle type reboiler [1] .

2.2.2. Design of kettle reboiler

The Kern method for designing of Kettle reboiler for isothermal boiling is summarized below. It is assumed that the degree of sub-cooling and super-heating of the cold fluid is negligible i.e. vaporization of close boiling compounds with negligible super-heating of vapors formed.

 

i. Make energy balance and determine the heat duty.

ii. Calculate of fluid property at the caloric temperature (or at arithmetic mean temperature) as already shown.

iii.  Follow the same guideline and design requirements for shell containing the vaporing liquid.

iv. Calculation of heat transfer co-efficient

Calculation of individual heat transfer co-efficient hot fluid: The calculation of heat transfer co-efficient of the hot fluid can be performed similarly as in case of design of shell and tube heat exchanger for single phase.

Calculation of individual heat transfer coefficient of the boiling liquid: The Kern method is discussed here to calculate the individual heat transfer co-efficient of the boiling liquid by trial and error procedure.