Calculation of technical and economic indicators of turbine units at ORC with low-boiling working fluids at supercritical parameters

Abstract

To assess the technical and economic performance indicators of ORC turbine units with low-boiling working fluids at supercritical parameters, the dependence of the exergy efficiency for turbine units with thermal energy regeneration at thermodynamically optimal pressures of low-boiling working fluids on their thermophysical properties (critical pressure and specific heat of condensation), as well as the initial temperature of the working fluids in front of the turbine in the temperature range from 100 to 300 oC. The obtained dependence also makes it possible to evaluate the thermodynamic efficiency of low-boiling working fluids for their further use in turbine units at supercritical parameters. The paper proposes a method for estimating the cost of turbine units with intermediate overheating and supercritical parameters of the working fluid, which makes it possible to predict the economic performance indicators of such turbine units. Thus, a methodology has been proposed for determining the technical and economic efficiency indicators of turbine units using supercritical parameters of low-boiling working fluids, which allows for a preliminary assessment of their efficiency without the use of complex calculations and the use of software to solve such a proble.