General Description-
You have been tasked to design a new shell-and-tube heat exchanger for the chemical plant in which you work. The heat exchanger will utilize cooling water to cool Syltherm 800 (a heat transfer ?uid).
The Syltherm 800 is used in a certain process as a cooling medium, as the process operates at too high of a temperature to use water. The flow rate of Syltherm is 1,000,000 lbm/hr, and it exits the process at 500oF. It must be cooled to 180oF before being recycled to the process.
The cooling water used to cool the Syltherm 800 is available at 65oF. For safety reasons, the maximum allowable water effluent temperature is 120oF.
As a minimum, the following will need to be determined for this heat exchanger:
- Which fluid is on shell-side/tube-side
- Number of shell passes
- Number of tube passes
- Number of tubes
- Tube pitch (center-to-center distance between tubes)
- Tube size (ID and OD)
- Shell size (ID only)
- Total heat transfer area required
- Length of the tube passes (can't be too long!)
When designing your heat exchanger, keep in mind the following:
- It must be reasonably sized. If you get a tube length required of 1.5 km, something is very wrong in your design (perhaps add more tubes?). Conversely, if you get a length of 5 cm, you probably have too many tubes.
- Pay attention to the pressure drop through both the shell side and tube side. Part of your analysis will need to be the cost of the electricity for the pumps to pump the fluid through the heat exchanger.
- Don't forget to add in some fouling allowances in your overall heat transfer coefficient calculation.
Attachment:- Assignment.pdf