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Investigation of Water Consumption Reduction and Exergoeconomic Analysis of Hybrid Cooling Towers

Azizi Kordkandi, Mohammad | 2017

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 50458 (08)
  4. University: Sharif University of Technology
  5. Department: Mechanical Engineering
  6. Advisor(s): Saidi, Mohammad Hassan; Asghari, Mohsen
  7. Abstract:
  8. Nowadays, cooling towers are widely used in power plants, refineries, petrochemicals and ventilation industries, but the water consumption of these towers is high and because of water crisis in Middle East and Iran, it is necessary to devise in order to reduce the water consumption of these towers. In this study separated hybrid cooling tower are used to investigate the water consumption at power plants. The rigorous Poppe method are used in order to estimate the exact amount of water loss due to evaporation in wet cooling towers. First, the effect of ambient condition, wet cooling tower cells and dry cooling tower size on the performance of hybrid cooling tower are investigated, then the optimum design of hybrid cooling tower in order to optimize water consumption, capital investment, pay back period and power generation are conducted using Simulated annealing and Genetic algorithms. In order to compare the hybrid towers, the exergy-economic view is used and the exergy destruction rate is evaluated in different parts of the hybrid cooling tower. The simulation results show that the use of the hybrid cooling tower reduces the annual consumption of water by keeping the turbine output constant, at least 55% compared to the wet cooling tower. Also, the optimization results indicated that with the assumption of $ 0.07/kWh for electricity cost and $ 1.71 per cubic meter for water, the return of investment for the construction of a dry cooling tower was 10 years and the rate of water consumption for this project was 55%. The simulation results also showed that the proposed designs for the hybrid tower were a function of the cost ratio of electricity and water units, and by increasing this ratio, the use of a hybrid cooling tower instead of a wet cooling tower would be cost-effective
  9. Keywords:
  10. Optimization ; Dry Cooling Tower ; Wet Cooling Tower ; Water Conservation ; Exergo Economic Analysis ; Hybrid Cooling Tower

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