Integrated thermoeconomic optimization of standard and regenerative ORC for different heat source types and capacities

Braimakis, Konstantinos; Karellas, Sotiriοs

doi:10.1016/j.energy.2017.01.042

Cited by 64 publications

(24 citation statements)

References 84 publications

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“…In this work, the ORC is a regenerative ORC in order to achieve high thermodynamic efficiency . Moreover, the studied system has no superheating because it is usually not beneficial in ORC . The utilized working fluid is isopentane, which is a usually selected choice for medium temperature ORC as in the present work.…”

Section: Methodsmentioning

confidence: 99%

“…29 Moreover, the studied system has no superheating because it is usually not beneficial in ORC. 30 The utilized working fluid is isopentane, which is a usually selected choice for medium temperature ORC as in the present work. More specifically, the critical temperature of the isopentane is about 187°C, which is close to the high-temperature levels of the studied system, and this fact makes it a proper choice.…”

Section: The Examined Configurationmentioning

confidence: 99%

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Design of a solar‐driven cogeneration system using flat plate collectors and evacuated tube collectors

Bellos

Tzivanidis

2019

Int J Energy Res

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Summary The objective of this work is the investigation of a novel solar‐driven cogeneration system, which combines both flat plate collectors (FPCs) and evacuated tube collectors (ETCs). This system includes an organic Rankine cycle in order to produce electricity and heat exchangers in order to produce useful heating at 50°C, which is a usual temperature level for domestic applications. The combination of FPCs and ETCs aims to reduce the investment cost and so to design a cost‐effective solar‐driven cogeneration system. The FPCs are located before the ETCs in order to work at lower temperature levels and the ETC at higher temperature levels, a design which provides optimum compatibility between temperature levels and solar thermal efficiency values. The system is examined energetically, exergetically, and financially. The power production is selected at 5 kW, while the heating production is studied from 5 kW up to 35 kW. According to the final results, it is found that in the typical case of 20‐kW heating production, the simple payback period of the system is around 11 years, while the energy and exergy efficiency at 16% and 4%, respectively. The analysis is conducted with a developed model in Engineering Equation Solver under steady‐state conditions.

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Section: Methodsmentioning

confidence: 99%

Section: The Examined Configurationmentioning

confidence: 99%

Design of a solar‐driven cogeneration system using flat plate collectors and evacuated tube collectors

Bellos

Tzivanidis

2019

Int J Energy Res

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“…The other costs are calculated by taking into account the start-up costs (SUC) represented by the start of the equipment, the initial capital of the thermal system (WC), the costs associated with the research and development of activities (LRD), in addition to the costs associated with the provision of funds during construction (AFUDC); all of this is shown in Equation (9).…”

Section: Thermoeconomic Analysismentioning

confidence: 99%

“…In order to increase the energy efficiency, different modifications have been proposed to the ORC architecture, several of the proposed improvements aim to optimize the temperature profile, where the organic working fluid follows the external heat source in order to reduce the exergy destroyed in the evaporator and thus increase the general second low efficiency of the system. One of the modifications to the architecture of this system is known as RORC, where research has been carried out to increase the efficiency of the cycle by 9.29%, and from the data obtained from these studies it can also be appreciated that both the RORC and the simple ORC (SORC) work better with drier fluids, where the efficiency of the cycle was also affected by the critical temperature [8][9][10]. These studies are limited to compare only the SORC and RORC cycles, and the double-stage ORC (DORC) study is not integrated with exhaust gases from a natural gas engine as a heat source.…”

Section: Introductionmentioning

confidence: 99%

Thermoeconomic Optimization with PSO Algorithm of Waste Heat Recovery Systems Based on Organic Rankine Cycle System for a Natural Gas Engine

2019

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To contribute to the economic viability of waste heat recovery systems application based on the organic Rankine cycle (ORC) under real operation condition of natural gas engines, this article presents a thermoeconomic optimization results using the particle swarm optimization (PSO) algorithm of a simple ORC (SORC), regenerative ORC (RORC), and double-stage ORC (DORC) integrated to a GE Jenbacher engine type 6, which have not been reported in the literature. Thermoeconomic modeling was proposed for the studied configurations to integrate the exergetic analysis with economic considerations, allowing to reduce the thermoeconomic indicators that most influence the cash flow of the project. The greatest opportunities for improvement were obtained for the DORC, where the results for maximizing net power allowed the maximum value of 99.52 kW, with 85% and 80% efficiencies in the pump and turbine, respectively, while the pinch point temperatures of the evaporator and condenser must be 35 and 16 °C. This study serves as a guide for future research focused on the thermoeconomic performance optimization of an ORC integrated into a natural gas engine.

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“…Designs 2018, 2, x 9 of 23 Table 3 includes the other parameters of this work. The heat exchanger cost is selected at 10 k€ [42], the project lifetime (N) is 25 years, and the discount factor (r) is 3% [38]. The cost of the heat is estimated to be 0.10 €/kWh [43].…”

Section: Financial Analysismentioning

confidence: 99%

Energetic and Financial Optimization of Solar Heat Industry Process with Parabolic Trough Collectors

Bellos

Daniil

Tzivanidis

2018

Designs

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The objective of this work is the investigation of a solar heat industry process with parabolic trough solar collectors. The analysis is conducted for the climate conditions of Athens (Greece) and for five load temperature levels (100 • C, 150 • C, 200 • C, 250 • C, and 300 • C). The examined configuration combines parabolic trough solar collectors coupled to a storage tank and an auxiliary heat source for covering the thermal need of 100 kW. The solar thermal system was optimized using the collecting area and the storage tank volume as the optimization variables. There are three different optimization procedures, using different criteria in every case. More specifically, the solar coverage maximization, the net present value maximization, and the payback period minimization are the goals of the three different optimization procedures. Generally, it is found that the payback period is between five and six years, the net present value is between 500-600 k€, and the solar coverage is close to 60%. For the case of the 200 • C temperature level, the optimum design using the net present value criterion indicates 840 m 2 of solar collectors coupled to a storage tank of 15.3 m 3 . The optimization using the solar cover indicates the use of 980 m 2 of solar collectors with a tank of 28 m 3 , while the payback period minimization is found for a 560 m 2 collecting area and an 8-m 3 storage tank volume. The results of this work can be used for the proper design of solar heat industry process systems with parabolic trough collectors.

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Integrated thermoeconomic optimization of standard and regenerative ORC for different heat source types and capacities

Cited by 64 publications

References 84 publications

Design of a solar‐driven cogeneration system using flat plate collectors and evacuated tube collectors

Design of a solar‐driven cogeneration system using flat plate collectors and evacuated tube collectors

Thermoeconomic Optimization with PSO Algorithm of Waste Heat Recovery Systems Based on Organic Rankine Cycle System for a Natural Gas Engine

Energetic and Financial Optimization of Solar Heat Industry Process with Parabolic Trough Collectors

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