Evaluation and Selection of Dry and Isentropic Working Fluids Based on Their Pump Performance in Small-Scale Organic Rankine Cycle

2021 ◽  
pp. 116919
Author(s):  
Xinxin Zhang ◽  
Yin Zhang ◽  
Jingfu Wang
Keyword(s):  
Organic Rankine Cycle ◽  
Rankine Cycle ◽  
Small Scale ◽  
Working Fluids ◽  
Pump Performance ◽  
Selection Of

scholarly journals A Review of Recent Research on the Use of R1234yf as an Environmentally Friendly Fluid in the Organic Rankine Cycle

2021 ◽  
Vol 13 (11) ◽  
pp. 5864
Author(s):  
Juan J. García-Pabón ◽  
Dario Méndez-Méndez ◽  
Juan M. Belman-Flores ◽  
Juan M. Barroso-Maldonado ◽  
Ali Khosravi
Keyword(s):  
Internal Combustion Engines ◽  
Organic Rankine Cycle ◽  
Environmentally Friendly ◽  
Electrical Energy ◽  
Rankine Cycle ◽  
Residual Energy ◽  
Combustion Engines ◽  
Medium Temperature ◽  
Working Fluids ◽  
Selection Of

ORC technology is one of the most promising technologies for the use of residual energy in the generation of electrical energy, offering simple and environmentally friendly alternatives. In this field, the selection of working fluids plays an important role in the operation of the cycle, whether in terms of the energy efficiency or the minimization of environmental impacts. Therefore, in this paper, a comprehensive review is presented on the use of R1234yf refrigerant and its mixtures as working fluids in ORC systems. These fluids are used in low- and medium-temperature applications for the use of residual energy generated from solar energy, geothermal energy, and internal combustion engines. It was concluded that R1234yf and its mixtures are competitive as compared with conventional refrigerants used in ORC.

scholarly journals Techno-Economic Optimization of Medium Temperature Solar-Driven Subcritical Organic Rankine Cycle

Thermo ◽  
2021 ◽  
Vol 1 (1) ◽  
pp. 77-105
Author(s):  
Tryfon C. Roumpedakis ◽  
Nikolaos Fostieris ◽  
Konstantinos Braimakis ◽  
Evropi Monokrousou ◽  
Antonios Charalampidis ◽  
...  
Keyword(s):  
Storage Tank ◽  
Organic Rankine Cycle ◽  
Rankine Cycle ◽  
Small Scale ◽  
Medium Temperature ◽  
Working Fluids ◽  
Solar Conversion ◽  
Tank Capacity ◽  
Solar Field ◽  
Field Area

The present work focuses on the techno-economic assessment and multi-objective genetic algorithm optimization of small-scale (40 kWth input), solar Organic Rankine Cycle (ORC) systems driven by medium-to-high temperature (up to 210 °C) parabolic dish (PDC) and trough (PTC) collectors. The ORCs are designed to maximize their nominal thermal efficiency for several natural hydrocarbon working fluids. The optimization variables are the solar field area and storage tank capacity, with the goal of minimizing the levelized cost of produced electricity (LCoE) and maximizing the annual solar conversion efficiency. The lowest LCOE (0.34 €/kWh) was obtained in Athens for a high solar field area and low storage tank capacity. Meanwhile, the maximum annual solar conversion efficiencies (10.5–11%) were obtained in northern cities (e.g., Brussels) at lower solar field locations. While PTCs and PDCs result in similar efficiencies, the use of PTCs is more cost-effective. Among the working fluids, Cyclopentane and Cyclohexane exhibited the best performance, owing to their high critical temperatures. Notably, the systems could be more profitable at higher system sizes, as indicated by the 6% LCoE decrease of the solar ORC in Athens when the nominal heat input was increased to 80 kWth.

Study and Selection of Working Fluids for Organic Rankine Cycle (ORC) Using Engine Waste Heat Energy

2012 ◽  
Vol 468-471 ◽  
pp. 3113-3116
Author(s):  
Kai Yang ◽  
Jian Zhang ◽  
Hong Guang Zhang ◽  
Yan Chen ◽  
Bin Liu ◽  
...  
Keyword(s):  
Waste Heat ◽  
Organic Rankine Cycle ◽  
Rankine Cycle ◽  
Exhaust Gas ◽  
Heat Absorption ◽  
Main Criterion ◽  
Working Fluids ◽  
Single Screw ◽  
The Mathematical Model ◽  
Selection Of

In this paper, a basic ORC system is proposed to recover the exhaust gas energy of vehicle engines, and the mathematical model of the ORC system is built. Thirteen working fluids are analyzed. The main criterion for selecting working fluids is the mass flow rate and the heat absorption rate under the same power output of single-screw expander. Then, the paper presents an analysis of the irreversibility rate and thermal efficiency of the ORC system using 4 different organic working fluids.

Toward the Integrated Design of Organic Rankine Cycle Power Plants: A Method for the Simultaneous Optimization of Working Fluid, Thermodynamic Cycle, and Turbine

2019 ◽  
Vol 141 (11) ◽  
Author(s):  
Matthias Lampe ◽  
Carlo De Servi ◽  
Johannes Schilling ◽  
André Bardow ◽  
Piero Colonna
Keyword(s):  
Integrated Design ◽  
Organic Rankine Cycle ◽  
Design Procedure ◽  
Thermodynamic Cycle ◽  
Rankine Cycle ◽  
Operating Conditions ◽  
Working Fluid ◽  
Small Scale ◽  
Iterative Design ◽  
Selection Of

Abstract The conventional design of organic Rankine cycle (ORC) power systems starts with the selection of the working fluid and the subsequent optimization of the corresponding thermodynamic cycle. More recently, systematic methods have been proposed integrating the selection of the working fluid into the optimization of the thermodynamic cycle. However, in both cases, the turbine is designed subsequently. This procedure can lead to a suboptimal design, especially in the case of mini- and small-scale ORC systems, since the preselected combination of working fluid and operating conditions may lead to infeasible turbine designs. The resulting iterative design procedure may end in conservative solutions after multiple trial-and-error attempts due to the strong interdependence of the many design variables and constraints involved. In this work, we therefore present a new design and optimization method integrating working fluid selection, thermodynamic cycle design, and preliminary turbine design. To this purpose, our recent 1-stage continuous-molecular targeting (CoMT)-computer-aided molecular design (CAMD) method for the integrated design of the ORC process and working fluid is expanded by a turbine meanline design procedure. Thereby, the search space of the optimization is bounded to regions where the design of the turbine is feasible. The resulting method has been tested for the design of a small-scale high-temperature ORC unit adopting a radial-inflow turbo-expander. The results confirm the potential of the proposed method over the conventional iterative design practice for the design of small-scale ORC turbogenerators.

Small scale Organic Rankine Cycle testing for low grade heat recovery by using refrigerants as working fluids

2018 ◽  
Vol 79 (3) ◽  
pp. 70-78
Author(s):  
Emanuele Fanelli ◽  
Simone Braccio ◽  
Giuseppe Pinto ◽  
Giacinto Cornacchia ◽  
Giacobbe Braccio
Keyword(s):  
Heat Recovery ◽  
Organic Rankine Cycle ◽  
Rankine Cycle ◽  
Small Scale ◽  
Low Grade ◽  
Working Fluids ◽  
Low Grade Heat

scholarly journals Influence of working fluid evaporation temperature in the near-critical point region on the effectiveness of ORC power plant operation

2012 ◽  
Vol 33 (3) ◽  
pp. 73-83 ◽  
Author(s):  
Władysław Nowak ◽  
Aleksandra Borsukiewicz-Gozdur ◽  
Sławomir Wiśniewski
Keyword(s):  
Critical Point ◽  
Organic Rankine Cycle ◽  
Rankine Cycle ◽  
Maximum Power ◽  
Critical Conditions ◽  
Working Fluid ◽  
Working Fluids ◽  
Evaporation Temperature ◽  
Evaporation Enthalpy ◽  
Selection Of

Abstract In the paper presented are definitions of specific indicators of power which characterize the operation of the organic Rankine cycle (ORC) plant. These quantities have been presented as function of evaporation temperature for selected working fluids of ORC installation. In the paper presented also is the procedure for selection of working fluid with the view of obtaining maximum power. In the procedure of selection of working fluid the mentioned above indicators are of primary importance. In order to obtain maximum power there ought to be selected such working fluids which evaporate close to critical conditions. The value of this indicator increases when evaporation enthalpy decreases and it is known that the latent heat of evaporation decreases with temperature and reaches a value of zero at the critical point.

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