| Abstrakt: |
A major problem in the open cooling systems is high make-up water consumption. The purpose of this research work is to use of the optimized refrigeration cycle (close loop) and related heat exchanger network to reduce make-up water consumption instead of traditional and customary cooling towers. In open loop case, more than 1050 m3/hr is consumed as make-up cooling water. With considering the refrigeration cycle, this make-up water will be zero. For considering the technical and economic analysis, these processes have been simulated by Aspen HYSYS and Aspen Capital Cost Estimator software, respectively. For closed loop system, a compression section and power generating unit are needed. The operating costs for evaporative open cooling (2,012,910 $/yr) are higher than its amount in refrigeration close loop cycle (1,865,328 $/yr) due to the higher make-up water demand. Also, the capital cost of refrigeration and evaporative cooling systems are 107 and 42 million dollars, respectively. Therefore, the investment of closed loop is higher than open loop system due to expensive compression section. In conclusion, the use of closed loop is not preferred from economic policy, but it is suggested in dry locations with low environmental impacts. |
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