Authors

Low-boiling working fluids for turbine installations on the organic Rankine cycle

DOI: 10.17586/1606-4313-2025-24-4-28-34
UDC 658.261:621.56

Low-boiling working fluids for turbine installations on the organic Rankine cycle

Ovsyannik Anatoly V., Klyuchinsky Vladislav P.

For citation: Ovsyannik A.V., Klyuchinsky V.P. Low-boiling working fluids for turbine installations on the organic Rankine cycle. Journal of International Academy of Refrigeration. 2025. No 4. p. 28-34. DOI: 10.17586/1606-4313-2025-24-4-28-34 (in Russian

Abstract
This study presents a comprehensive investigation of the thermodynamic properties of low-boiling working fluids used in turbine intsallatins operating on the Organic Rankine Cycle (ORC). Special attention is given to analyzing key parameters that affect the efficiency of energy equipment, including the physicochemical properties of working fluids and their operational characteristics. The research involved a detailed thermodynamic analysis of more than thirty different low-boiling compounds. For each working fluid, the following parameters were determined: environmental safety indicators (ozone depletion potential and global warming potential), critical state parameters, specific heat of condensation, as well as optimal pressure values in the condenser and at the turbine inlet. The accuracy of the obtained results is confirmed by a minimal calculation error not exceeding 10%. Of particular scientific value are the identified correlations between exergetic efficiency and key working fluid parameters. Specifically, it was found that maximum efficiency is achieved when using substances with minimal critical pressure and maximum specific heat of condensation. Graphical dependencies clearly demonstrate the influence of temperature and pressure at the turbine inlet on the system's exergetic efficiency. The obtained results allow for the development of a scientifically grounded methodology for the preliminary selection of working fluids for ORC turbine systems operating in the temperature range of 100–300 °C. The practical significance of this research lies in its potential to optimize energy equipment parameters and improve thermal energy conversion efficiency. The findings can be applied in the design of modern energy systems, contributing to the advancement of energy-saving technologies and the reduction of environmental impact.

Keywords: turbine installation, low-boiling working fluid, optimization, exergetic efficiency, thermophysical properties, efficiency, refrigerant, critical parameters.

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