EXERGETIC ANALYSIS OF COOLING SYSTEMS WITH OZONATION WATER-TREATMENT

The purpose of this paper is to perform an analysis on cooling systems with ozonation water treatment equipment according to the second law (exergetic analysis) of thermodynamics. In addition, an analysis of oz onation systems themselves is made with different cooling alternatives . The exergetic analysis is better than just the energetic one (the fi rst law of thermodynamics) because it gives a clearer explanation of t he performance. In particular, it takes into consideration the impact of the system on the environment. According to the analysis in this pa per, for the evaporative condenser, the minimum change in exergy with respect to the entering temperatures of air and water does exist. For other variables, the changes in exergy just increase or decrease monot onically with respect to mass flow rate, power input or temperature. F or the cooling tower system investigated, a minimum change in exergy w ith respect to the entering temperatures of air and water does not er, ist. The study done by Carollo Engineers and the Metropolitan Water Di strict of Southern California (MWD) was from an economic viewpoint, an d from their report, Alternative (2A) was the most superior. However, from an exergetic viewpoint, Alternatives 1 and 5 are lower in the cha nge of exergy than the other alternatives. Therefore, the exergetic an alysis has been demonstrated to be useful for investigating cooling sy stems with ozonation water treatment. (C) 1998 Elsevier Science Ltd. A ll rights reserved.