Doctor of Philosophy (PhD)
First Committee Member
Samir F. Moujaes
Second Committee Member
Third Committee Member
Fourth Committee Member
Fifth Committee Member
Number of Pages
The aim of this research is to provide a detailed numerical analysis of flow field and heat transfer inside the heat collecting element of a parabolic trough collector. The parabolic trough collector is used as the boiler in a direct Super Critical Carbon Dioxide (S-CO2) Brayton cycle.
A single collector is modeled and analyzed with different inlet conditions. The working fluid is supercritical since its pressure is increased to above critical pressure in the compressor while its temperature reaches 300 °C after passing through the recuperators and before entering the solar field. For the first time, this research considers both the non-uniform solar radiation irradiance around the trough receiver and the natural convection inside the receiver combined with the nonlinear variations in the physical properties of S-CO2.
Moreover, to investigate the variations in the outputs during a typical day a pseudo steady state scheme is applied. The changes in ambient conditions are so slow compared to the variations in the flow field that in each time step the flow filed is considered to fulfill the
steady state conditions. Hence, steady state numerical analysis is repeated for five time-steps (8 AM, 10 AM, 12 PM, 2 PM and 4 PM) and the results are graphed. A curve is then fitted to the thermal efficiency graph and outlet temperature of receiver graph to let the user interpolate the middle time steps.
CFD; numerical analysis; Parabolic trough; solar; Supercritical Carbon dioxide; thermal power plant
Aerodynamics and Fluid Mechanics | Mechanical Engineering | Thermodynamics
Gharehdaghimollahajloo, Samad, "Numerical Characterization of the Flow Field and Heat Transfer Inside the Receiver of a Parabolic Trough Solar Collector Carrying Supercritical Co2" (2017). UNLV Theses, Dissertations, Professional Papers, and Capstones. 3132.