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Use of Numerical Simulation to Study the Reduction of Steam Turbine Back Pressure Via Implementing Heat Pipe in Upstream Air Condenser

Mashayekh, Kazem | 2019

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 52482 (45)
  4. University: Sharif University of Technology
  5. Department: Aerospace Engineering
  6. Advisor(s): Darbandi, Masoud
  7. Abstract:
  8. Iran's experience shows that either single or combined power generation cycles, face heavy summer performance deficiencies. The most limitation of power generation in steam cycles is due to their poor condenser performance.The less condenser performance, the more turbine back pressure, and the more turbine back pressure, the less cycle power generation. The main objective of the present study is to reduce steam turbine back pressure in the combined cycle of an organic Rankine-vapor compression refrigeration by installing heat pipes in suitable locations inside the Air cooled condense (ACC). In order to do so, a commercial numerical simulation solver (FLUENT) is used to find the most suitable heat pipe to use in the best possible positions inside the ACC. Therefore, Geometrical parameters such as installation location, layout, etc., and performance parameters such as back pressure reduction in steam turbine and heat capacity of heat pipe, etc. must be taken into account. In order to achieve this purpose, first, the heat pipe modeling and simulation are performed and then, using the results of the heat pipe, three different arrangement of heat pipes in the ACC are evaluated. Finally, the arrangement with the most condenser performance is selected. Finally, a complete simulation of the multi-cell air condenser equivalent to that of the condenser unit is performed in combination with the organic Rankine-vapor compression refrigeration combined with the heat pipes therein, and the steam turbine back pressure drop generated by the heat pipe is obtained and the efficiency of the heat pipes in the combined cycle of the organic Rankine-vapor compression refrigerant on the steam turbine power is also investigated. The present study shows that the best heat pipe arrangement on the air condenser is the third arrangement. Using the maximum possible number of heat pipes in the ACC will increase the condenser performance up to 1.4% in the off-design conditions
  9. Keywords:
  10. Thermosyphon Heat Pipe ; Capacity Heat ; Air Cooled Condenser ; Back Pressure ; Numerical Simulation ; Combined Organic Rankine-vapor Compression Refrigeration

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