A review on geothermal Organic Rankine cycles: modeling and optimization

Haghighi, Arman; Pakatchian, Mohammad Reza; Assad, Mamdouh El Haj; Duy, Vinh Nguyen; Nazari, Mohammad Alhuyi

doi:10.1007/s10973-020-10357-y

Cited by 74 publications

(30 citation statements)

References 61 publications

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“…Afterwards, the pump is used to increase the fluid pressure and complete the cycle (Javanshir et al, 2017). Adding some components such as regenerator units to the simple ORCs can improve the power output of the systems; however, the cost of the system will be increased (Haghighi et al, 2020). When using regenerative ORCs, a heat exchanger is installed at the outlet of the turbine, which makes it possible to preheat the fluid entering the evaporator by transferring heat from the outlet fluid of the turbine and the fluid entering the evaporator as shown in operation range and efficiency of the cycle (Mirzaei et al, 2018).…”

Section: Thermodynamic Of the Orcsmentioning

confidence: 99%

“…Generally, photovoltaic cells are employed for direct power generation while thermal configurations are utilized for indirect power production from solar. To generate power indirectly using solar energy, different technologies and cycles can be used (Grange et al, 2014;Ahmadi et al, 2018;Wang et al, 2019); however, Organic Rankine Cycles (ORCs) are one of the most feasible ones due to its ability to produce power using medium or low-temperature heat sources (Castelli et al, 2019;Haghighi et al, 2020).…”

Section: Introductionmentioning

confidence: 99%

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Applications of Thermal Energy Storage in Solar Organic Rankine Cycles: A Comprehensive Review

et al. 2021

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Organic Rankine Cycles (ORCs) are promising approaches for generating power from medium or low temperature heat sources. In this regard, ORCs can be used to indirectly produce power from solar energy. Due to intermittent nature of solar energy, storage unit should be coupled with solar ORCs to improve the output power and operating hours. In this article, studies on solar ORCs integrated with various types of storage units were reviewed; the main findings of such studies were extracted and provided. Based on the findings, several factors such as the temperature and pressure at the inlet of the turbine, as well as the operating condition affect the performance of solar ORCs with thermal storage unit just like the conventional ORCs. In addition, the optimum size of the storage unit in the solar ORCs was found to depend on the operating condition. From the financial perspective, it can be noted that the storage unit affects the corresponding indicators. Moreover, the improvement rate in the ORCs by applying storage units could be affected by the configuration of the system.

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Section: Thermodynamic Of the Orcsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Applications of Thermal Energy Storage in Solar Organic Rankine Cycles: A Comprehensive Review

et al. 2021

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“…A parametric study of flash pressure, ORC turbine inlet pressure, and temperature was conducted. Haghighi et al [11] performed a comprehensive study of previous research done on ORC cycles with different operating conditions and configurations. They found that according to the geothermal-based ORC cycle features, the final efficiency and cost differed extensively.…”

Section: Introductionmentioning

confidence: 99%

Energy, Exergy, Exergoeconomic, and Exergoenvironmental Assessment of Flash-Binary Geothermal Combined Cooling, Heating and Power Cycle

2021

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This research presents the energy, exergy, economic, and environmental assessment, and multi-objective optimization of a flash-binary geothermal CCHP cycle. A sensitivity analysis of production well inlet temperature and cooling to power flow ratio on exergetic, economic, and environmental parameters was conducted. Furthermore, the effects of the inflation rate and plant working hours on economic parameters were investigated. Results showed that increasing the production well inlet temperature harms exergy efficiency and exergetic performance criteria and results in a gain in exergo-environmental impact index and heating capacity. In addition, the total plant cost increased by raising the production well temperature. Furthermore, increasing the cooling to power flow ratio caused a reduction in exergy efficiency, exergetic performance criteria, and produced net power and an enhancement in exergy destruction, cooling capacity, and total plant cost. The exergy efficiency and total cost rate in the base case were 58% and 0.1764, respectively. Optimization results showed that at the selected optimum point, exergy efficiency was 4.5% higher, and the total cost rate was 10.3% lower than the base case. Levelized cost of energy and the pay-back period at the optimum point was obtained as 6.22 c$/kWh, 3.43 years, which were 5.14% and 6.7% lower than the base case.

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“…A large amount of low-grade energy is wasted in industrial processes, and it has great potential to recover this part of energy via organic Rankine cycle (ORC) technology. ORC systems have been used in geothermal energy utilization [1,2], solar power generation [3,4], industrial waste heat reclaim [5], internal combustion engine waste heat recovery [6][7][8], etc.…”

Section: Introductionmentioning

confidence: 99%

Preliminary Design of an Axial-Flow Turbine for Small-Scale Supercritical Organic Rankine Cycle

2021

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A small-scale organic Rankine cycle (ORC) with kW-class power output has a wide application prospect in industrial low-grade energy utilization. Increasing the expansion pressure ratio of small-scale ORC is an effective approach to improve the energy efficiency. However, there is a lack of suitable expander for small-scale ORC that can operate with a high efficiency under the condition of large expansion pressure ratio and small mass flow rate. Aiming at the design of high-efficiency axial-flow turbine in small ORC system, this paper investigates the performance of a kW-class axial-flow turbine and proposes a method for efficiency improvement. First, the preliminary design of an axial-flow turbine is conducted to optimize the geometric parameters and aerodynamic parameters. Then, the effects of tip clearance and trailing edge thickness on turbine performance are analyzed under design and off-design conditions. The results show that the efficiency of the two-stage or three-stage turbine is evidently better than that of the single-stage one. The output power and efficiency of the three-stage turbine are close to that of the two-stage turbine while the speed is lower. Meanwhile, the trailing edge loss and leakage loss can be significantly reduced via reducing the trailing edge thickness and tip clearance, and thus the turbine efficiency can be improved significantly. The estimated efficiency arrives at 0.82, which is 33% higher than that of the conventional turbine. Considering the limitation of turbine speed, three-stage axial-flow turbine is a feasible choice to improve turbine efficiency in a small-scale ORC.

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A review on geothermal Organic Rankine cycles: modeling and optimization

Cited by 74 publications

References 61 publications

Applications of Thermal Energy Storage in Solar Organic Rankine Cycles: A Comprehensive Review

Applications of Thermal Energy Storage in Solar Organic Rankine Cycles: A Comprehensive Review

Energy, Exergy, Exergoeconomic, and Exergoenvironmental Assessment of Flash-Binary Geothermal Combined Cooling, Heating and Power Cycle

Preliminary Design of an Axial-Flow Turbine for Small-Scale Supercritical Organic Rankine Cycle

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