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The Study of the Effects of Different Parameters on Solar Chimneys Used in Ventilation

Behzadi Saroukolaei, Mohammad | 2019

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 52309 (08)
  4. University: Sharif University of Technology
  5. Department: Mechanical Engineering
  6. Advisor(s): Kazemzadeh Hannani, Siamak
  7. Abstract:
  8. The purpose of present work is to study the effect of different parameters on the solar chimney used in ventilation. Experimental model and numerical model were used to achieve this goal. First, the model was numerically analyzed by Fluent software using Boussinesq approximation. The results of numerical modeling were validated by the empirical model. Finally, the numerical model can be used to investigate the effects of parameters which modeling is not possible by the empirical model for any reason. Experimental modeling was performed on a chimney with height and width of 180 and 62 cm, respectively. The thickness and angle of chimney in both experimental and numerical methods varied from 5 to 50 cm and 0 to 45 degrees, respectively The findings of this study reported the performance of solar chimneys and compared the values obtained with those presented by Chen et al., Zha et al., and the experimental work of the researcher. The findings of this study, in addition to being used in various stages of solar chimney design with the use of ventilation, provide a comprehensive vision on what is important in solar chimney design.The numerical results obtained in this study show that there is an optimum angle for maximum discharge resulting from solar chimney, which completely dependens on the chimney’s thickness. Numerical results show that there is no optimal thickness for maximum flow rate; in fact, with increasing chimney thickness, flow rate increases. The maximum flow rate created by the chimney was 82 liters per second, which occurred at the angle of 0 degree and the thickness of 50 cm. In addition, the difference between experimental and numerical results increases with increase of chimney’s thickness. This difference in velocity results might be because of the decrease in velocity values with the increase in thickness. As a result, measurement errors have a large share of the values indicated by the measuring device, which in turn causes more discrepancies
  9. Keywords:
  10. Solar Chimney ; Natural Ventilation ; Ventilation ; Zero Energy Building ; Air Conditioning

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