Modeling and Simulation of Energy and Exergy Analysis of closed Brayton cycle Combined with organic Rankine cycles for Parabolic Trough Solar Power Plant.

Abstract

Concentrating Solar Power (CSP) technology offers an interesting potential for future power generation and research on CSP systems of all types, particularly those with parabolic trough solar system has been attracting a lot of attention recently. In this paper, both energy and exergy performances of solar power plant, under different design and operating conditions are investigated. The E-draw Max and Engineering Equation Software (EES) software are used to model the power system and simulations prospectively. In the state-ofthe-art PTCs, technologies are considered to set the design parameters used in the modeling of the solar field. Therminol VP-1 is the heat transfer fluid on PTC similarly Supercritical Carbon dioxide (S-CO2) as working fluid for closed Bryton cycle and R123 for Organic Rankine Cycle. The combination of S-CO2 closed Brayton cycle and organic Rankine cycle (ORC) integrated with Solar Parabolic Trough Collectors (SPTC) has been used to produce power, in which S-CO2 cycle and ORC are arranged as a topping and bottoming cycle. The uses of S-CO2 as the working fluid, and organic Rankine cycles that are employed to recover the waste heat from the Brayton cycle. Now the power cycle system are assessed thermodynamically both the first and second law viewpoints. In thermodynamics, closed Brayton and ORC power cycle in the heat exchanger one and condenser sections, where the maximum exergy destruction and energy loss occurred respectively. Furthermore, the effects of varying some design and operating conditions on the energy and exergy performance of the PTCs and the S-CO2 closed Brayton combined with ORC power cycle are investigated. These parameters include Direct Normal Irradiance, Pressure Ratio, and Gas turbine inlet temperature. Subsequently, the resultant impacts of changing these parameters on the overall solar power plant energy and exergy efficiencies are examined. The energy and exergy efficiencies of the power cycle are found to be 53.7% and 60.59%, respectively. Thus, the overall combined CSP efficiency reached 13.7% at the pressure ratio of 2.5 and 850 W/m 2 solar radiation.