Energetic and economic investigation of Organic Rankine Cycle applications

Schuster, Andreas; Karellas, Sotiriοs; Kakaras, E.; Spliethoff, Hartmut

doi:10.1016/j.applthermaleng.2008.08.016

Cited by 420 publications

(200 citation statements)

References 11 publications

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“…In addition to the choice of WF, cycle configuration is another important factor for optimal performance. A common enhancement to the standard Rankine cycle is incorporating an internal heat exchanger (recuperator) [23].…”

Section: Introductionmentioning

confidence: 99%

Modeling and optimization of a binary geothermal power plant

Ghasemi

Paci

Tizzanini

et al. 2013

Energy

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6A model is developed for an existing organic Rankine cycle (ORC) utilizing a low temperature geothermal source. The model is implemented in Aspen Plus ® and used to simulate the performance of the existing ORC equipped with an air-cooled condensation system. The model includes all the actual characteristics of the components. The model is validated by approximately 5000 measured data in a wide range of ambient temperatures. The net power output of the system is maximized. The results suggest different optimal operation strategies based on the ambient temperature. Existing literature claims that no superheat is optimal for maximum performance of the system; this is confirmed only for low ambient temperatures. For moderate ambient temperatures (T amb ≥ 1.7 ) superheat maximizes net power output of the system. The value of the optimal superheat increases with increasing ambient temperature.The optimal operation boosts the total power produced in a year by 9%. In addition, a simpler and semi-analytic model is developed that enables very quick optimization of the operation of the cycle. Based on the pinch condition at the condenser, a simple explicit formula is derived that predicts the outlet pressure of the turbine as a function of mass flow rate of working fluid.

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Section: Introductionmentioning

confidence: 99%

Modeling and optimization of a binary geothermal power plant

Ghasemi

Paci

Tizzanini

et al. 2013

Energy

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“…ORC systems are suitable to operate at part load and with variable input conditions without decreasing their efficiency drastically and allow an interesting conversion efficiency of thermal energy to electricity in the size range below 5 MW e [21,22]. The solar field has a net aperture area of about 8600 m 2 and, at nominal conditions, it produces a thermal power of about 5 MW.…”

Section: Technical Details About Ottana Solar Facilitymentioning

confidence: 99%

Progress in preliminary studies at Ottana Solar Facility

Demontis

Camerada

Cau

et al. 2016

AIP Conference Proceedings

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Abstract. The fast increasing share of distributed generation from non-programmable renewable energy sources, such as the strong penetration of photovoltaic technology in the distribution networks, has generated several problems for the management and security of the whole power grid. In order to meet the challenge of a significant share of solar energy in the electricity mix, several actions aimed at increasing the grid flexibility and its hosting capacity, as well as at improving the generation programmability, need to be investigated. This paper focuses on the ongoing preliminary studies at the Ottana Solar Facility, a new experimental power plant located in Sardinia (Italy) currently under construction, which will offer the possibility to progress in the study of solar plants integration in the power grid. The facility integrates a concentrating solar power (CSP) plant, including a thermal energy storage system and an organic Rankine cycle (ORC) unit, with a concentrating photovoltaic (CPV) plant and an electrical energy storage system. The facility has the main goal to assess in real operating conditions the small scale concentrating solar power technology and to study the integration of the two technologies and the storage systems to produce programmable and controllable power profiles. A model for the CSP plant yield was developed to assess different operational strategies that significantly influence the plant yearly yield and its global economic effectiveness. In particular, precise assumptions for the ORC module start-up operation behavior, based on discussions with the manufacturers and technical datasheets, will be described. Finally, the results of the analysis of the: "solar driven", "weather forecasts" and "combined storage state of charge (SOC)/ weather forecasts" operational strategies will be presented.

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“…In mini-and small-scale applications, scroll expanders are often used. The volume flow ratio between outlet and inlet is in the range of 2.7 to 5.4, isentropic efficiency ranges from 42% to 68% [29][30][31]. Screw expanders are an alternative to scroll expanders especially for wet working fluids (negative slope of the dew line) as gap losses are reduced for vapor fractions of 80% to 95% [32,33].…”

Section: Organic Raninke Cyclementioning

confidence: 99%

Thermoeconomic Evaluation of Modular Organic Rankine Cycles for Waste Heat Recovery over a Broad Range of Heat Source Temperatures and Capacities

Preißinger

Brüggemann

2017

Energies

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Industrial waste heat recovery by means of an Organic Rankine Cycle (ORC) can contribute to the reduction of CO 2 emissions from industries. Before market penetration, high efficiency modular concepts have to be developed to achieve appropriate economic value for industrial decision makers. This paper aims to investigate modularly designed ORC systems from a thermoeconomic point of view. The main goal is a recommendation for a suitable chemical class of working fluids, preferable ORC design and a range of heat source temperatures and thermal capacities in which modular ORCs can be economically feasible. For this purpose, a thermoeconomic model has been developed which is based on size and complexity parameters of the ORC components. Special emphasis has been laid on the turbine model. The paper reveals that alkylbenzenes lead to higher exergetic efficiencies compared to alkanes and siloxanes. However, based on the thermoeconomic model, the payback periods of the chemical classes are almost identical. With the ORC design, the developed model and the boundary conditions of this study, hexamethyldisiloxane is a suitable working fluid and leads to a payback period of less than 5 years for a heat source temperature of 400 to 600 • C and a mass flow rate of the gaseous waste heat stream of more than 4 kg/s.

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Energetic and economic investigation of Organic Rankine Cycle applications

Cited by 420 publications

References 11 publications

Modeling and optimization of a binary geothermal power plant

Modeling and optimization of a binary geothermal power plant

Progress in preliminary studies at Ottana Solar Facility

Thermoeconomic Evaluation of Modular Organic Rankine Cycles for Waste Heat Recovery over a Broad Range of Heat Source Temperatures and Capacities

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