Investigation on the use of a novel regenerative flow turbine in a micro-scale Organic Rankine Cycle unit

Energy ◽  
2020 ◽  
Vol 210 ◽  
pp. 118519 ◽  
Author(s):  
Ramin Moradi ◽  
Emanuele Habib ◽  
Enrico Bocci ◽  
Luca Cioccolanti
Keyword(s):  
Organic Rankine Cycle ◽  
Rankine Cycle ◽  
Micro Scale ◽  
Regenerative Flow

scholarly journals Component-Oriented Modeling of a Micro-Scale Organic Rankine Cycle System for Waste Heat Recovery Applications

2021 ◽  
Vol 11 (5) ◽  
pp. 1984
Author(s):  
Ramin Moradi ◽  
Emanuele Habib ◽  
Enrico Bocci ◽  
Luca Cioccolanti
Keyword(s):  
Electric Power ◽  
Heat Recovery ◽  
Waste Heat Recovery ◽  
Waste Heat ◽  
Organic Rankine Cycle ◽  
Rankine Cycle ◽  
Operating Conditions ◽  
Working Fluid ◽  
Pump Efficiency ◽  
Micro Scale

Organic Rankine cycle (ORC) systems are some of the most suitable technologies to produce electricity from low-temperature waste heat. In this study, a non-regenerative, micro-scale ORC system was tested in off-design conditions using R134a as the working fluid. The experimental data were then used to tune the semi-empirical models of the main components of the system. Eventually, the models were used in a component-oriented system solver to map the system electric performance at varying operating conditions. The analysis highlighted the non-negligible impact of the plunger pump on the system performance Indeed, the experimental results showed that the low pump efficiency in the investigated operating range can lead to negative net electric power in some working conditions. For most data points, the expander and the pump isentropic efficiencies are found in the approximate ranges of 35% to 55% and 17% to 34%, respectively. Furthermore, the maximum net electric power was about 200 W with a net electric efficiency of about 1.2%, thus also stressing the importance of a proper selection of the pump for waste heat recovery applications.

Development of micro-scale axial and radial turbines for low-temperature heat source driven organic Rankine cycle

2016 ◽  
Vol 130 ◽  
pp. 141-155 ◽  
Author(s):  
Ayad Al Jubori ◽  
Ahmed Daabo ◽  
Raya K. Al-Dadah ◽  
Saad Mahmoud ◽  
Ali Bahr Ennil
Keyword(s):  
Low Temperature ◽  
Heat Source ◽  
Organic Rankine Cycle ◽  
Rankine Cycle ◽  
Micro Scale ◽  
Temperature Heat ◽  
Radial Turbines

Experimental study of micro-scale organic Rankine cycle system based on scroll expander

Energy ◽  
2019 ◽  
Vol 188 ◽  
pp. 115930 ◽  
Author(s):  
Chao Liu ◽  
Shukun Wang ◽  
Cheng Zhang ◽  
Qibin Li ◽  
Xiaoxiao Xu ◽  
...  
Keyword(s):  
Experimental Study ◽  
Organic Rankine Cycle ◽  
Rankine Cycle ◽  
Micro Scale ◽  
Cycle System ◽  
Scroll Expander

Numerical Investigation on the Performance of a Regenerative Flow Turbine for Small-Scale Organic Rankine Cycle Systems

2019 ◽  
Vol 141 (9) ◽  
Author(s):  
Ramin Moradi ◽  
Luca Cioccolanti ◽  
Enrico Bocci ◽  
Mauro Villarini ◽  
Massimiliano Renzi
Keyword(s):  
Organic Rankine Cycle ◽  
Rankine Cycle ◽  
Operating Conditions ◽  
Small Scale ◽  
Cfd Analysis ◽  
Cycle Systems ◽  
Mass Flow Rates ◽  
Computational Fluid Dynamics Cfd ◽  
Regenerative Flow ◽  
Operating Points

In this study, the performance characteristics of a regenerative flow turbine (RFT) prototype have been investigated by means of a computational fluid dynamics (CFD) study. The prototype has been initially designed to be used in gas pipelines replacing expansion valves but, because of the intrinsic characteristics of this kind of expander, its use can be extended to other applications like the expansion process in small-scale organic Rankine cycle (ORC) plants. In the first part of this work, the numerical results of the CFD analysis have been validated with the experimental data reported in literature for the same turbine prototype. After the validation of the model, a detailed study has been carried out in order to evaluate specific features of the turbine, focusing the attention on the typical operating conditions of small-scale low-temperature ORC systems. Results have shown that the considered RFT prototype operates with higher isentropic efficiencies (about 32% at 6000 rpm) at lower mass flow rates, while the power output is penalized compared to other operating points. The numerical analysis has also pointed out the high impact of the losses in the leakage flow in the gap between the blade tips and the stripper walls. Therefore, the CFD analysis carried out has provided a thoughtful understanding of the performance of the expander at varying operating conditions and useful insights for the future redesign of this kind of machine for the application in small-scale ORCs.

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