Design and optimization of a Tesla turbine for ORC applications

Talluri, Lorenzo; Fiaschi, Daniele; Neri, G.; Ciappi, Lorenzo

doi:10.1016/j.apenergy.2018.05.057

Cited by 53 publications

(28 citation statements)

References 46 publications

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“…Energies 2018, 11, x FOR PEER REVIEW 3 of 21 31.2 kW, were obtained correspondingly when the average evaporating temperature was 77.1, 79.5 and 82.3 °C, respectively. A tesla turbine is also a good choice for ORC applications [34,35]. Though many studies have been carried out on radial flow turbines, few researchers pay attention to the relationship between turbine performance and the operation parameters, as well as nozzle performance in the turbine.…”

Section: The Orc System and The Micro Radial Flow Turbinementioning

confidence: 99%

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Experimental Investigation on Performance of an Organic Rankine Cycle System Integrated with a Radial Flow Turbine

Pan

Wang

2019

Energies

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An experimental method is used to investigate the performance of a small-scale organic Rankine cycle (ORC) system which is integrated with a radial flow turbine, using 90 °C hot water as a heat source. The considered working fluids are R245fa and R123. The relationship between cycle performance and the operation parameters is obtained. With constant condensing pressure (temperature), the outlet temperature of the hot water, the mass flow rate of the hot water and the evaporator heat transfer rate increase with increasing evaporating pressure. Turbine isentropic efficiency decreases and transmission-generation efficiency increases with rising evaporating pressure. In the considered conditions, the maximum specific energy is 1.28 kJ/kg, with optimal fluid of R245fa and an optimal evaporating temperature of 69.2 °C. When the evaporating pressure (temperature) is constant, the outlet temperature of the cooling water increases, and the mass flow rate of the cooling water decreases with increasing condensing pressure. Turbine isentropic efficiency increases and transmission-generation efficiency decreases with the rise of condensing pressure. In the considered conditions, the maximum specific energy is 0.89 kJ/kg, with optimal fluid of R245fa and an optimal condensing temperature of 29.1 °C. Turbine efficiency is impacted by the working fluid type, operation parameters and nozzle type.

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Section: The Orc System and The Micro Radial Flow Turbinementioning

confidence: 99%

“…Three electric power values, 24.5 kW, 26.9 kW and 31.2 kW, were obtained correspondingly when the average evaporating temperature was 77.1, 79.5 and 82.3 • C, respectively. A tesla turbine is also a good choice for ORC applications [34,35].…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation on Performance of an Organic Rankine Cycle System Integrated with a Radial Flow Turbine

Pan

Wang

2019

Energies

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“…The high content of carbon oxides, nitrogen and sulfur in the atmosphere leads to the formation of acids. Acids together with precipitation fall to the ground and are absorbed by groundwater [9][10][11]. As the experience of operating thermal power plants using the organic Rankine cycle shows, additional equipment pays off within 5-6 years when it is introduced into the system of technical water supply and heat supply.…”

Section: Problem Relevancementioning

confidence: 99%

Environmentally Friendly Organic Rankine Cycle Technology Based on Improved Absorption Refrigerating Machine

Осинцев¹,

Дудкин²,

Prikhodko³

et al. 2019

Proceedings of the VIII Science and Technology Conference “Contemporary Issues of Geology, Geophysics and Geo-Ecology of the No

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The purpose of the work is the development of environmentally friendly technology of heat recovery from condensation of water vapor at a constant partial pressure of the outgoing flue gases in contact heat exchangers with a passive nozzle at thermal power plants running on natural gas, and the use of solar heaters in the block structure of an absorption refrigerating machine. Using contact heat exchangers can reduce greenhouse gas emissions. Greenhouse gas is harmful to the environment. Using solar heaters can improve the efficiency of the Li-Br absorption refrigerating machine. Ways to improve the efficiency of industrial enterprises are different. One of the main ways is to use renewable energy for heat recovery. In addition, the use of renewable energy sources reduces emissions of harmful greenhouse gases into the atmosphere.

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“…The assessment of Tesla turbine performance when working with CO2 was carried out by the means of a home-made developed 2D code in Engineering Equation Solver (EES) environment [10]. The complete set of equations is reported in [11,12]. The model was obtained through the reduction of Navier-Stokes equations in cylindrical coordinates, under the assumptions of viscous, compressible steady flow and neglecting body forces influence.…”

Section: D Modelmentioning

confidence: 99%

Design and off-design analysis of a Tesla Turbine utilizing CO₂ as working fluid

Fiaschi

Talluri

2019

E3S Web Conf.

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The Tesla turbine is a bladeless expander; which principle of operation is based on the conversion of the viscous forces, developed by the flow while expanding through the rotor, in mechanical energy. It is especially suitable for small/micro size distributed energy systems (kW scale), mainly due to its very low cost, which results from the simple structure of the machine. The Tesla turbine works well at relatively moderate expansion ratios. Therefore, it is fit for CO2 power cycles applications that are characterised by small expansion ratio, despite the high pressure involved. In this work, the design and off-design analysis of a Tesla turbine for small/micro power application utilizing CO2 cycles is proposed. The optimized design was targeted for an inlet temperature of 150 °C and an inlet pressure of 220 bar. The final optimized geometry of the expander was defined, achieving a 23.4 W per channel power output with a 63% isentropic efficiency, when working with a 10.1 bar pressure drop at 2000 rpm. Furthermore, the turbine placement on the Baljè diagram was performed in order to understand the direct competitors of this machine. Finally, starting from the design configuration, the maps of efficiency at variable load and flow coefficients and that of reduced mass flowrate at variable pressure ratio were realized. Through the merging of these curves, the off-design maps of the Tesla turbine were obtained, highlighting a very limited sensitivity of the efficiency to variable working conditions, if rotational speed is adequately adjusted.

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Design and optimization of a Tesla turbine for ORC applications

Cited by 53 publications

References 46 publications

Experimental Investigation on Performance of an Organic Rankine Cycle System Integrated with a Radial Flow Turbine

Experimental Investigation on Performance of an Organic Rankine Cycle System Integrated with a Radial Flow Turbine

Environmentally Friendly Organic Rankine Cycle Technology Based on Improved Absorption Refrigerating Machine

Design and off-design analysis of a Tesla Turbine utilizing CO₂ as working fluid

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Design and optimization of a Tesla turbine for ORC applications

Cited by 53 publications

References 46 publications

Experimental Investigation on Performance of an Organic Rankine Cycle System Integrated with a Radial Flow Turbine

Experimental Investigation on Performance of an Organic Rankine Cycle System Integrated with a Radial Flow Turbine

Environmentally Friendly Organic Rankine Cycle Technology Based on Improved Absorption Refrigerating Machine

Design and off-design analysis of a Tesla Turbine utilizing CO2 as working fluid

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Product

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Design and off-design analysis of a Tesla Turbine utilizing CO₂ as working fluid