Reboiler heat transfer calculation?

The heat transfer calculation for the bottom reboiler of an inserted U-tube tower requires taking into account many factors, such as the physical properties of the fluid, flow rate, pressure, etc. The specific calculation methods can involve the use of heat transfer principles and formulas, or specialized thermal engineering software such as HTRI can be employed for these calculations. During the actual calculation, it is necessary to take into account the thermodynamic properties of the medium at the bottom of the tower, including the temperature, density, specific heat capacity, and thermal conductivity of both the gas and liquid phases. At the same time, it is also necessary to consider the steam heating capacity and flow rate in the tube side at the bottom of the tower. Using the above information, it is possible to estimate parameters such as the heat transfer coefficient and heat exchange area of the boiler, thereby determining its heat exchange efficiency. For the heat transfer calculation of the bottom reboiler in an interposed U-tube column, HTRI can be used for the calculations. HTRI is a professional thermal design software that can perform heat transfer calculations for various media such as liquid-liquid, gas-liquid, and gas-gas. However, before using HTRI for calculations, it is necessary to enter the test data accurately and validate the model to ensure the accuracy of the calculation results. .

Calculations were performed using the HTRI software, with a kettle-type reboiler selected; however, the software was unable to perform calculations assuming that the material flows into the column in two streams. Could you provide the specific steps or procedure for manual calculation?