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Development of Thermo-aerodynamic Devices for Increasing the Performance of Cooling System with Natural Draft in Power Plant Cycle

Javadpoor، Pooya | 2017

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 49781 (45)
  4. University: Sharif University of Technology
  5. Department: Aerospace Engineering
  6. Advisor(s): Darbandi, Masoud
  7. Abstract:
  8. According to the climates of the country, using natural draft dry air cooling systems at the power plant is one of the proposed solutions for lower water consumption, but strong wind can make drop in performance of power plant cooling systems based on Rankine Cycle. This means that wind disrupted the order of the normal flow of air intake around the tower by creating areas of low pressure, preventing the flow of air into the cooling system. In the world, many researches and solutions have been proposed to solve the problem. The most common of these solutions is using of windbreaks as aerodynamic devices to compensate for the pressure drop in the cooling tower when the wind blows. But thermo-aerodynamic devices never be used for this subject. In this study, by development of auxiliary thermo-aerodynamic devices, strong wind that was mentioned earlier as a negative factor, as a positive factor for the cooling disposal can be used, in addition to the aerodynamic effect around the main cooling system. In recent years with the development of computers and the use of CFD, the full flow physics could be studied without high costs and without building and testing of actual equipment. Therefore, in this study the cooling systems with natural draft with auxiliary thermo-aerodynamic devices will be simulated numerically when wind is blowing at different speeds by using commercial software. In order to accurately perfect solution, the flow physics, the equations of fluid and software options studied well. In this study, six different plans for auxiliary thermo-aerodynamic devices are developed. In order to evaluate the effect of the devices on cooling system, the heat released by the cooling system has been studied and presented pressure and air velocity in different areas. In the end, the best plan is presented in terms of improved performance. The effect of the aerodynamics of these devices when the thermodynamic part is disabled will be compared in three different modes. The results show that using selected auxiliary thermo-aerodynamic devices at different speeds can compensate at least 55% for the loss of cooling system performance. In addition, disabling the thermodynamic part of the equipment and use them as auxiliary aerodynamic devices can be remedied the natural draft cooling system performance loss at least 31 percent
  9. Keywords:
  10. Heat Exchangers ; Dry Cooling Tower ; Computational Fluid Dynamics (CFD) ; Numerical Simulation ; Winds ; Pressure Loss ; Cooling System ; Auxiliarg Thermoaerodynamic Devices

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