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Design of an Optimized Gas-liquid Auxiliary Heat Exchanger to Improve Performance of a Rankin Cycle Using CFD

Mirhashemi, Ahmad | 2014

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 45900 (45)
  4. University: Sharif University of Technology
  5. Department: Aerospace Engineering
  6. Advisor(s): Darbandi, Masoud
  7. Abstract:
  8. The enviromental wind would cause serious drop in the performance of Heller cooling systems in thermal powerplants working on Rankin cycle. Therfore, it is necessary to consider the wind velocity in the design of such cooling tower systems. We use the computational fluid dynamics (CFD) and simulate the 3D buoyant flow passing through and over a heel cooling tower. We consider three different wind veocities of 0, 5 and 10 m/s in our simulations. In order to consider the low efficiency of the cooling system in efficiency drop of the main rankin cycle, we need to consider actual power generated by the powerplant generator, which is directly affected by the turbine back pressure. To connect the turbine pressure variation with the Rankin cooling system efficiency, we simulate the powerplant cycle entierly in addition to the CFD simulation of its cooling system. This coupling will provide good connection between the inefficiency of the cooling system with the inefficiency of the powerplant cycle.Moreover, we design some additional air-liquid heat exchangers, which can help the heller cooling system in critical ambient condition. To optimize these auxiliary heat exchanger, we simulate both the powerplant cycle and its cooling system at different wind conditions and atmospheric temperature. We introuduce the case with least inefficency as the best or optimum air-liquid heat exchanger
  9. Keywords:
  10. Wind Blowing ; Computational Fluid Dynamics (CFD) ; Thermal Power Plants ; Dry Cooling Tower ; Rankin Cycle ; Air-Liquid Heat Exchanger

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