A geospatial analysis approach for the operational assessment of solar ORC systems. Case study: Performance evaluation of a two-stage solar ORC engine in Greece

Soulis, Konstantinos X.; Manolakos, Dimitris; Ntavou, Erika; Kosmadakis, George

doi:10.1016/j.renene.2021.09.046

Cited by 14 publications

(8 citation statements)

References 55 publications

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“…The solar system is designed based on the location of Jazan city, KSA, and all-weather information of the temperatures. And to obtain the highest thermal energy, the values of the temperature between 150 o C to 240 o C were used from 8 am to 17 pm, and the working hours vary according to the year seasons [57][58][59][60][61][62][63][64][65][66][67]. According to the results of some researchers [18,34,58,[68][69][70][71][72], at an air temperature of 35, the system gives a heat concentration of up to 403 degrees Celsius, produced by one equivalent dish, equivalent to 4576 watts.…”

Section: Components and Alternative Of Orc Working Fluidsmentioning

confidence: 99%

Optimal Organic Working Fluid for the Rankine Cycle Operating by Parabolic Trough Solar Collector

Hassan

2024

Preprint

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This paper investigates finding the best working fluid to improve the giving of the solar organic Rankine cycle. A parabolic trough solar complex was designed to focus the sun rays on a vicious cylinder to produce sufficient steam to operate the ORC. The steam is collected in an isolated tank filled with molten salt called an evaporator. The heat gained in this evaporator is transferred to feed the power generation turbine. Ten different working fluids of R123, R143a, R433A, R290, R40, R22, R600a, R601, RC318 and R1270 were tested at a boiling temperature from 150°C to 240°C. The results showed that using R601 as a working fluid for ORC gave the highest thermal efficiency compared to other organic liquids tested at temperatures from 150 to 240 °C. R601 gives a gain in cycle thermal efficiency by about 24.6% relative using R600a. While R 290 gave an improvement in the power produced by the turbine estimated at 10% higher than that used at higher temperatures above 240° C.

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Section: Components and Alternative Of Orc Working Fluidsmentioning

confidence: 99%

Optimal Organic Working Fluid for the Rankine Cycle Operating by Parabolic Trough Solar Collector

Hassan

2024

Preprint

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“…But, Liu et al 8 used a two-stage ORC and obtained an ORC efficiency improvement of 8% to 12%. Soulis et al 9 studied a two-stage solar-driven ORC and performed a geospatial analysis to properly evaluate this technology and found that the overall system performance ranged from 2.2% to 2.8% year-on-year. ORC is a cycle like the traditional water/steam Rankine cycle but works with organic fluids and is generally a less complex unit than the water/steam Rankine cycle.…”

Section: Introductionmentioning

confidence: 99%

Experimental and Theoretical Study to Increase the Solar-Organic Rankine Cycle Efficiency

Alshahrany

Hassan

2023

Yanbu Journal of Engineering and Science

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Under conditions of high climate temperature and environmental pollution, scientists are turning to the use of new and renewable energy. The solar Organic Rankin Cycle (ORC) is greatest technology for converting low or medium-temperature energy sources into electricity. For the purpose of generating steam from solar energy to power the organic Rankin cycle a system consists of solar pond, flat plate collector and parabolic dish was designed, implemented, and tested to use in organic Rankin cycle (ORC). The novelty in the present work is the use of the solar pond as storage of heat that does not lose because the salinity gradient middle layer in the pond does not allow heat to pass through it, as well as the use of reheating to enhance the thermodynamic efficiency. Also, an analytical model has been made to enhance the output power and efficiency of the solar thermal ORC according to some organic control criteria. A Cycle of solar thermal power plants (ORC) is simulated with four refrigerants, R144a, R123, R124 and R245fa of working fluid’s performance. The cycle net-specific work can be verified at the highest efficiency as a function of turbine extraction numbers, over-temperature, and evaporation temperature. Superheated steam was obtained at a temperature of 327 °C to be used in the Rankin cycle of the solar energy system which is generated in this work. The maximum output power improvement is 9% when using the working fluid R123 for R124, 5.5% for R245fa, and approximately 2.8 for R144a. And the thermal efficiency of ORC is higher with R123 compared to 144a by about 2.2%. Furthermore, it also concluded that both inlet and outlet temperatures of a turbine are very important factors that affect the operational performance of organic Rankin cycle power generation systems.

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“…Many works have been published in the literature (e.g. [4][5][6][7]) assessing the potential and efficiency of the ORC, both numerically and experimentally, with different heat sources. The main drawback of the ORC is the drop in its thermal efficiency at lower heat source temperatures.…”

Section: Introductionmentioning

confidence: 99%

“…This approach in two-phase expansion modeling comes to fill a gap in the relevant literature since several theoretical works studying the performance of the TFC have been published, but the two-phase expander is usually treated as a black box with isentropic efficiencies achieved in the dry-vapor region [17,18]. R245fa is selected as the WF of the TFC, because it has been tested as a WF in Solar-ORC systems, numerically and experimentally, demonstrating very good thermodynamic behavior within the range of temperature and operating pressure ratios of low-temperature solar systems [6,7]. This paper is organized as follows.…”

Section: Introductionmentioning

confidence: 99%

Trilateral Flash Cycle for Efficient Low-Temperature Solar Heat Harvesting - A Case Study

Skiadopoulos

Antonopoulou

Ατσόνιος

et al. 2023

36th International Conference on Efficiency, Cost, Optimization, Simulation and Environmental Impact of Energy Systems (ECOS 20

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In this work, the annual performance of a solar thermal power system in Greece is numerically studied. The system consists of a field of Evacuated Tube Collectors and a Trilateral Flash Cycle engine. The main target of this study is to assess the potential of the Trilateral Flash Cycle, a promising higher efficiency alternative to the Organic Rankine Cycle, for solar energy exploitation. The effects of the solar irradiance, the temperature of the heat source, and the flashing efficiency on the total solar energy conversion efficiency are monitored. The economics of the system is preliminarily studied taking into account its scale and the anticipated annual power output. Simulations indicate that the combined Solar-Trilateral Flash Cycle system can achieve an average annual total solar energy conversion efficiency of 5%, outperforming a Solar-Organic Rankine Cycle system of similar architecture at the examined location. It is demonstrated that the efficiency of the Trilateral Flash Cycle engine is highly dependent on the quality of the Working Fluid at the onset of expansion, and the operating pressure ratio. Moreover, the Trilateral Flash Cycle can achieve a thermal efficiency of up to 11%. The Levelized Cost of Electricity of the power system is estimated to lie in the region of 0.26 -0.32 €/kWh, based on its scale, indicating that it may be a competitive solution for solar energy exploitation.

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A geospatial analysis approach for the operational assessment of solar ORC systems. Case study: Performance evaluation of a two-stage solar ORC engine in Greece

Cited by 14 publications

References 55 publications

Optimal Organic Working Fluid for the Rankine Cycle Operating by Parabolic Trough Solar Collector

Optimal Organic Working Fluid for the Rankine Cycle Operating by Parabolic Trough Solar Collector

Experimental and Theoretical Study to Increase the Solar-Organic Rankine Cycle Efficiency

Trilateral Flash Cycle for Efficient Low-Temperature Solar Heat Harvesting - A Case Study

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