Examples from HDA of Toluene
Simulation of counter current heat transfer in exchanges is very straightforward, but a number of special cases may require special functions to handle them. The following Matlab functions have been used for several years in CENG 403:
| Program | Simulates | Assumptions |
|---|---|---|
| htxcc1 | Counter (or co-) current heat exchanger. | Constant flow*specific heat for each fluid, constant U and A. |
| htxcc2 | Constant temperature on one side of exchanger. | Constant flow*specific heat for one fluid, constant U and A. |
| htxcc3 | Similar to htxcc1 , but the arguments are different. | Constant flow*specific heat for each fluid, constant U and A. |
| htx2tub | Two pass counter current heat exchanger. | Constant flow*specific heat for each fluid, constant U and A. |
The restriction to fluids with constant flow*heat capacity could be interpreted to mean that those programs cannot be used if there is a change of state of the fluid. In a strict sense that is true, but we can get reasonable approximations by ignoring that restriction in some cases.
None of the programs listed in the table require compound data to be used, but we will see that in most our examples, it is convenient to load a data file so we can get reasonable heat capacity data.