Parametric Optimization of Low Temperature ORC System

Zhu, Kai; Zhang, Mi; Wang, Yabo; Sun, Zhili; Liu, Shengchun; Ning, Jinghong

doi:10.1016/j.egypro.2015.07.374

Cited by 17 publications

(7 citation statements)

References 6 publications

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“…Wang et al [11] studied a regenerative organic Rankine cycle to utilize the solar energy over a low temperature range using flat plate solar collectors. Kai et al [12] optimized the ORC system parameters and examined the effects of these optimal parameters for six working fluids (Butane, R236fa, R227ea, R236ea, R245fa and R245ca). Gao et al [13] examined the performance of solar based organic Rankine cycle through the various working conditions like inlet pressure and temperature of the turbine.…”

Section: Introductionmentioning

confidence: 99%

Exergy Analysis of the Organic Rankine Cycle Based on the Pinch Point Temperature Difference

Bademlioglu¹

2019

Journal of Thermal Engineering

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Organic Rankine Cycle (ORC) is a system that uses working fluids with hydrocarbon components instead of water and generates power from the heat recovery of different heat sources. In this study, the exergy analysis of a simple ORC, which produces electrical energy with the help a geothermal source (125°C), was performed. R123, R152a, R245fa and R600a were determined as the fluids to be used in the Cycle. In this analysis, which was carried out according to the pinch point temperature differences (5-20°C) in the evaporator, the exergy performance of the cycle components was evaluated for the geothermal resource unit flow rate and the variation of the exergy efficiency of the system was calculated. With the increase of the pinch point temperature difference in the evaporator, the decrease of the system's exergy efficiency became maximal (11.7%) with the use of R152a as a refrigerant and the loss in the system's exergy efficiency became minimal (9.03%) with the use of R123 as a refrigerant.

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Section: Introductionmentioning

confidence: 99%

Exergy Analysis of the Organic Rankine Cycle Based on the Pinch Point Temperature Difference

Bademlioglu¹

2019

Journal of Thermal Engineering

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“…Therefore, they were recommended and studied as candidates in ORC systems. 19,34,[53][54][55][56][57][58][59] The main properties and types of the selected fluids are listed in Table 2.…”

Section: Working Fluids Selectionmentioning

confidence: 99%

Assessment of the thermal efficiency of subcritical power generation cycles using environmentally friendly fluids at various heat source temperatures

Ahmed

2022

Energy Science & Engineering

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This study aims to investigate the effect of the various heat source temperature (T max ) on thermal efficiency (η th ) for the organic rankine cycle (ORC), trilateral flash cycle (TFC), and partial evaporator (PE-ORC). For this purpose, HFE7000, HFE7100, and HFE7500 were used as working fluids (WFs). The results indicate that by using HFE7000, the maximum η th was obtained for all used power cycles and temperature ranges. Compared to HFE7100, HFE7500 has higher η th at TFC, and PE-ORC at low T max , while HFE7100 has the maximum value at high T max . The η th at T max = 353 K for TFC were 8.71%, 8.34%, and 8.59%, while for ORC 12.38%, 11.82%, and 11.71% for HFE7000, HFE7100, and HFE7500, respectively. At T max = 423 K for TFC were 17.65%, 16.26%, and 16.52%, while for ORC were 18.56%, 17.38%, and 16.59% for HFE7000, HFE7100, and HFE7500, respectively. The η th results indicate that the maximum improvement at TFC by using HFE7000, and the minimum was at HFE7100, while for ORC, the maximum was at HFE7000, and the minimum was at HFE7500. Therefore, the HFE7000 fluid behaves as normal dry fluids at any used temperature, while HFE7100 as normal dry WFs at low T max while behaving as very dry WFs at T max extremely close to its T cr . HFE7500 behaves as very dry working fluids. The η th intersections temperature was at T max = 425.2 K and T max = 455.9 K for HFE7500 and HFE7100, respectively. However, there is no η th intersection for HFE7000.

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“…The equations used for total irreversibility (17), consumed exergy (18) and exergy efficiency (19) in the system are given below.…”

Section: Thermodynamic Analysismentioning

confidence: 99%

“…Gutierrez et al [13] accepted gross annual profit as an objective function, Han et al [14] as a total irreversibility loss, Pierobon et al [15] as a thermal efficiency, Agromayor et al [16] as a second law efficiency. Finally, Andreasen et al [17], Fiaschi et al [18] and Kai et al [19] used the net power as the objective function and studied both the optimum fluid selection and the thermodynamic optimization of the system with GA.…”

Section: Introductionmentioning

confidence: 99%

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Determination of Optimum Pinch Point Temperature Difference Depending on Heat Source Temperature and Organic Fluid with Genetic Algorithm

Ata

Kahraman

Şahin

2022

Academic Platform Journal of Engineering and Smart Systems

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In this study, the effect of evaporator pinch point temperature difference (∆TPP,e) value in Organic Rankine Cycle (ORC) on system performance was determined. Under different applications of ORC, optimum ∆TPP,e value has been determined in ORC systems designed with different heat source temperatures. By changing the ∆TPP,e value, the heat input provided to the system, the mass flow of organic fluid, the evaporation pressure and the enthalpy drop in the turbine are affected. In thermodynamic optimization, the objective function is determined as turbine power maximization. Genetic algorithm optimization technique is used. Within the scope of low and high temperature ORC applications, the optimum ∆TPP,e value of different organic fluids under 10 different heat source temperatures (Low, 90-130 °C; High, 250-290 °C) has been determined. Low temperature organic fluids have been selected from dry, isentropic, wet and new-generation categories. High temperature organic fluids have been selected from the alkane, aromatic hydrocarbon, and siloxane categories. The effect of ∆TPP,e on fluids of different categories was determined for low and high temperature ORCs. It has been determined that taking the ∆TPP,e value constant regardless of the heat source temperature and organic fluid causes performance loss in ORC.

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Parametric Optimization of Low Temperature ORC System

Cited by 17 publications

References 6 publications

Exergy Analysis of the Organic Rankine Cycle Based on the Pinch Point Temperature Difference

Exergy Analysis of the Organic Rankine Cycle Based on the Pinch Point Temperature Difference

Assessment of the thermal efficiency of subcritical power generation cycles using environmentally friendly fluids at various heat source temperatures

Determination of Optimum Pinch Point Temperature Difference Depending on Heat Source Temperature and Organic Fluid with Genetic Algorithm

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