A working flowsheet model of the Cooling Tower area has been developed. The ASPEN FLASH2 block used to simulate the Cooling Tower is an approximate representation that assumes one theoretical stage. The model can be used for simulating the Cooling Tower area at or near design conditions. The model also is suited for rating cases, because Cooling Tower turndown is achieved by turning off fans or shutting down cells, which maintains efficiencies nearly constant. The results of several case study runs made using the model were as expected. The model converged easily even when substantial changes were made to plant cooling load, air temperature and humidity, and blowdown rate. The model also showed that approximately all of the cycle water feed contaminants are stripped out in the Cooling Tower. The model behaves well, and no convergence problems have been found. 1 reference.