“…However, the avoidable part of TUR-1, TUR-2, and TUR-3's exergy destruction is superior to the unavoidable part, indicating that improving the turbine should be prioritized. This finding aligns with the analysis results reported in other literature [ 48 , 49 ]. Fig.…”
“…However, the avoidable part of TUR-1, TUR-2, and TUR-3's exergy destruction is superior to the unavoidable part, indicating that improving the turbine should be prioritized. This finding aligns with the analysis results reported in other literature [ 48 , 49 ]. Fig.…”
“…The overall endogenous exergy destruction of the system components was higher than the exogenous exergy destruction, indicating that the components themselves were the cause of inefficiencies. Tian et al [ 23 ] used conventional and advanced exergy analysis to investigate an ORC cycle. The turbine work output was 1.02 kW, and the maximum thermal efficiency was 8.8%.…”
A novel solar‐assisted cascade Rankine cycle‐driven reverse osmosis (RO) system is proposed and evaluated using conventional and advanced exergy analysis. The system comprises a solar collector as a heat input, steam Rankine cycle (SRC), and organic Rankine cycle (ORC) to generate turbine work and RO units for brackish water treatment. Water and R1233zd(E) are used as the working fluid in the SRC and ORC, respectively. The RO system is proposed to produce 1 m3 h−1 of permeate water from each RO unit. Conventional exergy analysis shows that the solar collector exhibits the highest exergy destruction of 0.798 kW, followed by the RO unit. However, advanced exergy analysis reveals that only 16.16% of the avoidable exergy in solar collectors can be reduced due to technical constraints. Advanced exergy analysis identified that endogenous avoidable exergy destruction contributes 24% of overall exergy destruction, which can be reduced by optimizing operating parameters and making technical improvements. The RO unit has a higher exogenous avoidable exergy, potentially suggesting improvements in other system component parameters. The advanced exergy analysis also prioritized the components for improving system performance in a sequence of RO high‐pressure pumps, RO modules, solar collector, ORC condenser, evaporative condenser, ORC expander, and SRC turbine.
“…Recent research on exergy applications include Tian et al, 26 who designed a recuperative Organic Rankine Cycle (ORC) with a T A B L E 1 Applications of exergy analysis-scientific literature review. three-fluid condenser for cryogenic cold energy recovery.…”
Section: Introductionmentioning
confidence: 99%
“…Recent research on exergy applications include Tian et al, 26 who designed a recuperative Organic Rankine Cycle (ORC) with a three‐fluid condenser for cryogenic cold energy recovery. The ORC's performance was investigated under varying heat source temperatures and heat sink flow rates.…”
Desalination can provide additional water resources in water‐stressed zones and also in zones suffering from water pollution or insufficient/overexploited groundwater. This study carried out the energy and exergy assessments of a multi‐effect desalination unit driven by a gas turbine based on the specific exergy cost (SPECO) approach. The chemical exergies of brine and seawater are explicitly considered (most studies consider the same specific heat for input seawater and output brine). In addition, the enthalpy of each flow of the desalination unit is considered according to its salt concentration (results are then compared to the constant specific heat model). The highest exergy rates of fuel and product are obtained at the combustion chamber, and its exergy efficiency is 67.83%. The lowest exergy efficiencies were obtained at the condenser, followed by the first effect of the desalination unit, and the heat recovery steam generator. The overall exergy efficiency of the multi‐effect distillation unit is 21.49%. Regarding exergy destruction, as expected, the highest rate was obtained at the combustion chamber, which contributed with 41% to the overall exergy destruction, followed by the regenerator and heat recovery steam generator, with contributions of 16% and 11%, respectively, to overall exergy destruction.
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