Loading...

Determination of Parabolic Trough Solar Collector Efficiency Using Al2O3/Synthetic Oil Nanofluid: A Comprehensive Numerical Study with The Effect of Wind Velocity

Khakrah, Hamid Reza | 2017

623 Viewed
  1. Type of Document: Ph.D. Dissertation
  2. Language: Farsi
  3. Document No: 50913 (58)
  4. University: Sharif University of Technology, International Campus, Kish Island
  5. Department: Science and Engineering
  6. Advisor(s): Shamloo, Amir; Kazemzadeh Hannani, Siamak
  7. Abstract:
  8. Due to significant reduction in fossil fuel sources; several researches have been conducted recently to explore modern sources of renewable energy. One of the major fields in the category of renewable energy harnessing devices is parabolic trough solar collectors (PTC). Several parameters have effect on the overall efficiency of the PTC’s.As the effect of these parameters is coupled to each other, a comprehensive investigation is necessary.In the present study a numerical analysis is performed to examine the efficiency of PTCs via variation of several governing parameters (e.g. wind velocity magnitude, nanoparticles volume fraction, inlet temperature and reflector’s orientation). A detailed set of absorber, reflector, and protection glass in addition to the surrounding environment is modeled to capture sufficiently accurate data. The working fluid is assumed to be nanofluid to inspect the advantage of metallic nanoparticle addition to the base fluid. The Monte Carlo radiation tracing method is utilized to calculate the solar gain on the absorber tube. According to the obtained results the efficiencies are reduced by 1 to 3 % percent by rotating the reflector by 30⁰ relative to wind direction. Moreover, 14.3 and 12.4% efficiency enhancement is obtained by addition of 5% volume fraction of Al2O3 to the base synthetic oil for horizontal and rotated reflectors, respectively. Moreover, in the present study energy and exergy efficiencies of a typical PTC as a function of several involving parameters are numerically calculated. These parameters are nanoparticles volume fraction (from 0 to 5 percent), environment wind speed (from still air to speed of 10 m/s) and the normalized HTF’s inlet temperature
  9. Keywords:
  10. Nanofluid ; Exergy Analysis ; Parabolic Collector ; Monte Carlo Method ; Wind Effect ; Comprehensive Study

 Digital Object List

 Bookmark

No TOC