New working fluids for the use of heat secondary sources in mining technologies

• Published in: IOP conference series. Earth and environmental science Vol. 1156; no. 1; pp. 12028 - 12034
• Main Authors: Kirsanov, Mykhailo, Gupalo, Olena, Podoliak, Kostiantyn
• Format: Journal Article
• Language: English
• Published: Bristol IOP Publishing 01.04.2023
• Subjects: Carbon dioxide; Climate change; Evaporation; Flammability; Global warming; Heat; Heat sources; Mining; Ozone depletion; Production costs; Thermodynamic efficiency; Thermodynamics; Working fluids
• ISSN: 1755-1307; 1755-1315
• DOI: 10.1088/1755-1315/1156/1/012028

Abstract Production cost of mining enterprises can be significantly reduced when using secondary heat. A large volume of secondary heat sources has a temperature potential of no higher than 50°C. To generate additional electricity using secondary heat it has been proposed to use installations with the Rankine thermodynamic cycle in mining enterprises. The paper aim is to study the thermodynamic efficiency of using R-1234yf and R-744 in the equipment, which uses the secondary heat of mining technologies for evaporation of these working fluids. R-1234yf is a freon that belongs to the class of hydrofluoroolefins and has a much lower level of global warming potential than other ozone-depleting substances. R-744 is carbon dioxide, which belongs to a natural, non-toxic and non-flammable working substance. It has been determined that the thermodynamic efficiencies of using R-1234yf and R-744 are 10% and 6.3%, respectively. The thermodynamic efficiency has been calculated for the temperature range from 50° to 20°C, which is typical for a large volume of secondary heat sources in mining technologies.