Investigation of Energy and Exergy of Geothermal Organic Rankine Cycle

Alghamdi, Mohammed I.; Al‐Kharsan, Ibrahim H.; Shahab, Sana; Albaker, Abdullah; Alayi, Reza; Kumar, Laveet; Assad, Mamdouh El Haj

doi:10.3390/en16052222

Cited by 8 publications

(3 citation statements)

References 27 publications

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“…The results indicated that using zeotropic mixtures is a promising approach to enhancing the economics of geothermal ORC systems. Alghamdi et al 28 analyzed the double flash geothermal cycle using zeotropic fluid in the ORC, evaluating its thermodynamics based on the first and second laws. Hexane, cyclohexane, and isohexane were identified as effective fluids for higher temperatures.…”

Section: Literature Reviewmentioning

confidence: 99%

Assessment of electrical power generation in various regions of Nepal through solar organic Rankine cycle technology

Baral

2023

Engineering Reports

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The utilization of solar organic Rankine cycle (ORC) technology in Nepal shows promise due to its ample solar radiation. This technology should be harnessed for the purpose of generating solar energy. The academic version of engineering equation solver was used to develop simulation models, which predict the potential of solar ORC power generation across the country. The study is limited to areas with solar irradiance of 5.5 kWh/m2/day and excludes certain regions. The installation of the plant requires open land with access to water, and a 10 km2 land area was considered for the solar collector. The working fluids for the solar ORC plant are R245fa, R11, and R123. The simulation results showed a maximum overall system efficiency of 6.8%. The power output for various districts was also simulated, with Jumla having the highest power output, followed by Baitadi and Surkhet. The power output for different temperatures (90–120°C) using R245fa as the working fluid was 270, 320, 350, and 380 MW. Additionally, the study determined the cost of electricity production for the system with working fluids. The cost of electricity production was found to be 164.11$/MWh, and the levelized cost of electricity ranged from 220–265$/MWh. The payback period for the investment varies from 18 to 12 years with an internal rate of return of over 10%. Furthermore, a sensitivity analysis was conducted to ascertain the feasible investment strategies for the solar ORC system. Therefore, the study concludes that a solar ORC plant is technically feasible in Nepal for electrical power generation, with promising potential for clean energy generation.

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Section: Literature Reviewmentioning

confidence: 99%

Assessment of electrical power generation in various regions of Nepal through solar organic Rankine cycle technology

Baral

2023

Engineering Reports

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“…Transcritical cycle configurations achieved the highest energy efficiency (17.7%), while isopentane performed better than isobutane and R245ca for the high-temperature geothermal reservoir. Alghamdi et al [20] studied the energy and exergy performance of a double-flash cycle with zeotropic mixtures for power generation from a high-temperature (200 • C) geothermal source. The highest net power and the lowest exergy dissipation were obtained with a mixture of cyclohexane and R236ea, which provided the best thermal match with the geothermal fluid.…”

Section: Introductionmentioning

confidence: 99%

Thermoeconomic Analysis of Subcritical and Supercritical Isobutane Cycles for Geothermal Power Generation

Blecich

2023

Sustainability

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This article presents a novel and comprehensive approach for the thermoeconomic evaluation of subcritical and supercritical isobutane cycles for geothermal temperatures of Tgeo = 100–200 °C. The isobutane cycles are optimized with respect to the maximum net power or minimum levelized cost of electricity (LCOE). Cycle optimization is also included, using a minimum superheat temperature to avoid turbine erosion, which is usually neglected in the literature. The results show that economic optimums are found in the far superheated region, while thermal optimums are obtained with dry saturated or with slightly superheated vapor at the turbine inlet (ΔTsup < 5 °C). Supercritical cycles achieve better thermal performance than subcritical cycles for Tgeo = 179–200 °C. Internal heat recuperation improves the cycle performance: the net power output increases and the LCOE decreases, but specific installation costs (SICs) increase due to the additional heat exchanger. For geothermal temperatures of Tgeo = 120 → 150 °C, the costs are LCOE = 100 → 80 USD2022/MWh and SIC = 7000 → 5250 USD2022/kW, while for geothermal temperatures of Tgeo = 150 → 200 °C, the estimated costs are LCOE = 80 → 70 USD2022/MWh and SIC = 5250 → 4600 USD2022/kW.

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“…[1][2][3][4] Solar energy has been identified as the most abundant source of energy, [5][6][7] and it has been estimated that the amount of solar energy entering the earth for 1 h is more than the annual energy consumption of world societies. [8][9][10][11] Currently, solar energy provides part of the energy needed by advanced countries in two forms: electrical energy through photovoltaic systems and thermal energy using solar collectors. [12][13][14] Among the types of solar systems technology, the linear parabolic collector has been widely accepted due to the fact that it can produce high temperatures for heating and cooling, , it needs less space to reflect sunlight in the focal area, and various ways have been proposed to increase the efficiency of this technology.…”

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confidence: 99%

Experimental investigation and thermodynamic analysis of application of hybrid nanofluid in a parabolic solar trough collector

Wang,

Abed,

Beemkumar

et al. 2024

The Journal of Chemical Physics

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In this research, thermal modeling has been done to investigate the effect of nanofluid on the performance of the linear parabolic collector. Therminol vapor/liquid phase fluid (VP-1) has been used as a base fluid; iron oxide nanoparticles have been used to produce mono-nanofluid; and iron oxide multi-walled carbon nanotubes nanocomposite has been used as nanoparticles to produce hybrid nanofluid. The fluid flow inside the absorber tube of the collector is assumed to be turbulent. The results show that when hybrid nanofluid and mono-nanofluid are used, the energy and exergy efficiencies of the collector are higher than those for the conditions of using the base fluid, but their amount is slightly lower with the use of hybrid nanofluid than when the working fluid is mono-nanofluid. According to the obtained results, the highest energy efficiency of the linear parabolic collector using nanofluid and mono-nanofluid is 70.2% and 70.4%, respectively, and the highest exergy efficiency is 35.7% and 35.9%, respectively. Despite this, the friction coefficient of mono-nanofluid compared to hybrid nanofluid was obtained on average about 9% higher. The results showed that the criterion for evaluating the performance of the collector (hydrodynamic thermal efficiency) when hybrid nanofluid is used is more than when mono-nanofluid is used.

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Investigation of Energy and Exergy of Geothermal Organic Rankine Cycle

Cited by 8 publications

References 27 publications

Assessment of electrical power generation in various regions of Nepal through solar organic Rankine cycle technology

Assessment of electrical power generation in various regions of Nepal through solar organic Rankine cycle technology

Thermoeconomic Analysis of Subcritical and Supercritical Isobutane Cycles for Geothermal Power Generation

Experimental investigation and thermodynamic analysis of application of hybrid nanofluid in a parabolic solar trough collector

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