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Optimal Design of the Heliostat Field in the Solar Central Receiver Systems

Piroozmand, Pasha | 2015

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 48178 (46)
  4. University: Sharif University of Technology
  5. Department: Energy Engineering
  6. Advisor(s): Boroushaki, Mehrdad
  7. Abstract:
  8. In a solar central system plant about 40% of energy losses occurs in the heliostat field. Furtheremore, half of the investment costs for construction of the plant is related to the heliostat field. Therefore, an optimal design of the heliostat field is necessary for reduction of levelized cost of energy in solar tower power plants. In this study, in order to optimally design the heliostat field, first energy performance of the helistat field in one year is simulated. Solar power and sun’s position at each moment of the day is determined by mathematical relations. Then, loss factors in the field are modelled and heliostat field layout is designed by an algorithm. Finally, by using PSO algorithm the optimal values of the field layout pattern shape coefficients are obtained. In order to validate the results with literatures, a 50 MW polar heliostat field in Dagget, California with similar features to PS10 plant is optimally designed. After the validation of the model, optimal design of the multi tower field is proposed. Due to the lack of an accurate model for considering all loss factors in multi tower heliostat field, a new method for calculation and optimization of the efficiency of multi tower fields is presented. As a case study, a two tower heliostat field, each tower and subfield similar to Gemasolar plant is simulated by the proposed method and then optimized with PSO algorithm. The results show that, the multi tower heliostat field has a better efficiency, which is about 54.56%, than the two single tower field. The heliostats behavior in the day for selecting proper receiver is shown and important factors such as tower’s heights in energy performance of multi tower fields is investigated in detail
  9. Keywords:
  10. Particles Swarm Optimization (PSO) ; Heliostat Field ; Shading and Blocking Factor ; Multi Tower Configuration ; Spiral Pattarn ; Polar Field

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