A modeling of electricity generation by using geothermal assisted organic Rankine cycle with internal heat recovery

Canbolat, Ahmet Serhan; Bademlioglu, Ali Husnu; Kaynaklı, Ömer

doi:10.1080/15567036.2019.1684598

Cited by 8 publications

(2 citation statements)

References 24 publications

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“…The thermal efficiencies were always higher with the recuperative ORC than with the basic cycle. Canbolat et al [70] modeled a recuperative cycle using dry fluids. The highest energy and exergy efficiencies were 16.7% and 60%, respectively, using R245fa.…”

Section: Recuperative Regenerative Reheated and Supercritical Orcsmentioning

confidence: 99%

A Comprehensive Review of Organic Rankine Cycles

et al. 2023

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It has been demonstrated that energy systems driven by conventional energy sources like fossil fuels are one of the main causes of climate change. Organic Rankine cycles can help to reduce that impact, as they can be operated by using the industrial waste heat of renewable energies. The present study presents a comprehensive bibliographic review of organic Rankine cycles. The study not only actualizes previous reviews that mainly focused on basic cycles operating on subcritical or supercritical conditions, but also includes the analysis of novel cycles such as two-stage and hybrid cycles and the used fluids. Recuperative and regenerative cycles are more efficient than reheated and basic single-stage cycles. The use of two-stage cycles makes it possible to achieve higher thermal efficiencies and net power outputs of up to 20% and 44%, respectively, compared with those obtained with single-stage cycles. Theoretical studies show that hybrid systems, including Brayton and organic Rankine cycles, are the most efficient; however, they require very high temperatures to operate. Most organic Rankine cycle plants produce net power outputs from 1 kW up to several tens of kW, mainly using microturbines and plate heat exchangers.

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Section: Recuperative Regenerative Reheated and Supercritical Orcsmentioning

confidence: 99%

A Comprehensive Review of Organic Rankine Cycles

et al. 2023

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“…For the low to medium temperature geothermal resources in the range of 90 o C to 300 o C, from the thermodynamic points of view, the efficiency of these kinds of geothermal power plants are capped by the temperature of geothermal fluid entering geothermal power plants [4]. On the other hand, fossil fuel power plant is presently the backbone of the electricity production, which has a better efficiency as the combustion temperature is much higher [5].…”

Section: Introductionmentioning

confidence: 99%

Optimisation of displacement selections and structures for the Geothermal Aided Power Generation plant

Zhou

Qin

2020

Preprint

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Geothermal Aided Power Generation (GAPG) technology is a method of integrating geothermal energy into a regenerative Rankine cycle (RRC) power plant. In such a power system, the geothermal energy is used to preheat the feedwater to boiler of the power plant. Therefore, the extraction steam of RRC power plant is displaced by the geothermal energy. Then, the displaced extraction steam is expended further in steam turbine to produce power. In a GAPG plant, a heat exchanger system is used to facilitate the heat exchange between the geothermal fluid and the feedwater. As power from geothermal energy comes from displaced extraction steam, different displacement selections for extraction steam would lead to different technical performance of the GAPG plant. When the geothermal fluid flows up from the geothermal well and quench to a lower temperature in the heat exchanger system, the silica scaling occurs in the heat exchanger system. As silica scaling can be controlled by adjusting geothermal fluid temperature, different displacement selections would have different influences on the silica scaling process in the heat exchanger system. There are two kinds of structures for the heat exchanger system of the GAPG plant, which are series structure and parallel structure. The different structures also lead to different performance of the GAPG plant. In present paper, a 300 MW GAPG plant is used as a case study to optimise displacement selections and structures of the GAPG plant. The results show that there is no silica scaling in the heat exchanger system for the displacement selection of geothermal energy to displace extraction to all high-pressure feedwater heaters. For this displacement selection, the power output of the Parallel GAPG plant is higher than the Series GAPG plant.

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