A system level modeling and performance evaluation of concentrated solar power plant

Hasany, Syed Zaid
This thesis presents a system level study for a solar thermal power plant comprising of parabolic trough collectors (PTC), an organic Rankine cycle (ORC) and a wet cooling tower. A transient numerical model is developed for the PTC accounting the thermal losses and coping up with the intermittent and inherent variable solar input. The transient PTC model is validated with the experimental and numerical results and extended to the double pass counter flow PTC configuration. It is found that there is no significant difference in efficiency for different cases for double pass and single pass but double pass manages to heat the water at high temperature due to premixing under constant conditions of inlet temperature. The numerical model of single pass PTC is integrated with the modified numerical model of ORC in which evaporator/condenser are modeled with transients effects while pump/expander are modeled with acceptable steady state assumptions, and cooling tower. Several different conditions are simulated on the verified ORC model with a range of constant hot water temperatures to the ORC and refrigerant mass flow rates. The power output has a direct relation with the hot water temperature and refrigerant mass flow rate. A full day simulation taking into account the temporal solar and ambient variations for the course of the day during the sun light hours is carried out. Three representative days of the year are selected for the simulations and found out that average power output is 14.5 kW, 14.88 kW and 15.16 kW for summer solstice, fall equinox and winter solstice respectively.


Detailed simulations of parabolic trough collector for investigating enhancement of heat transfer to absorber tube flow
Uygur, Sinan; Tarı, İlker; Department of Mechanical Engineering (2021-2-12)
In this thesis, a detailed method to simulate heat transfer and fluid flow of parabolic trough solar collectors is presented. An optical model of the considered collector is created with Tonatiuh ray tracing program. The data of ray tracing analysis is exported to MATLAB as a binary file for post-processing. Curve fitting and surface fitting to the data are performed to obtain the heat flux distribution on the absorber tube’s outer surface. User-defined functions (UDFs) for ANSYS Fluent Computational Fluid ...
Comparison of Dynamic PTC Thermal Models Using Semi-Analytical and Finite Volume Methods
Bayer, Özgür (2018-05-01)
Resource potential estimation of concentrating solar power (CSP) applications with parabolic through collectors (PTC) needs to address time-dependent heat transfer fluid (HTF) temperature at collector field's outlet. HTF temperature distribution depends on several time-dependent variables; i.e., HTF temperature at PTC inlet, direct beam radiation, HTF flow rate and its properties, and PTC parameters, i.e., overall heat transfer coefficient. The present paper develops a time-dependent one-dimensional thermal...
A methodology to assess suitability of a site for small scale wet and dry CSP systems
Uzgoren, Eray; Timur, Eray (2015-06-25)
This study presents a methodology to assess suitability of a site for small scale concentrated solar power (CSP) systems for its energy conversion efficiency and make-up water requirement. Energy conversion efficiency of CSPs relies not only on the level of direct solar radiation but also on the performance of the cooling system. Regions with high solar potential have to deal with heat rejection at elevated temperatures which causes reduced energy conversion efficiencies due to high condenser temperatures. ...
Comparision of dry and wet cooling: An applied research on a solar thermal power plant
Timur, Eray; Uzgören, Eray; Sustainable Environment and Energy Systems (2013-6)
The present study evaluates the use of air cooled heat exchangers for an organic Rankine cycle (ORC) as part of a solar thermal power system that can produce 10-30 kWe. Overall thermal efficiency of the system under investigation relies heavily on (i) available solar thermal energy, (ii) performance of the cooling system, and (iii) power consumption due to pumps and fans within the system. For locations with good solar potential but limited water resources, it is crucial to evaluate wet cooling towers...
Investigation of olive mill sludge treatment using a parabolic trough solar collector
Ben Othman, Fares; Eddhibi, Fathia; Bel Hadj Ali, Abdessalem; Fadhel, Abdelhamid; Bayer, Özgür; Tarı, İlker; Guizani, Amenallah; Balghouthi, Moncef (2022-01-15)
The olive mill sludge treatment system developed in this study is an indirect solar dryer driven by a solar parabolic trough collector (PTC). A heat exchanger is implemented to heat air with hot oil coming from the solar collector. The developed hot air dryer can treat up to 50 kg of olive mill sludge distributed over six trays at once. The designed system and its components are described, along with their experimental and simulated performance evaluations. With a mean direct normal irradiation (DNI) higher...
Citation Formats
S. Z. Hasany, “A system level modeling and performance evaluation of concentrated solar power plant,” M.S. - Master of Science, Middle East Technical University, 2013.