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Modified thermal balance method for estimating minimum inerting concentraion of flammable refrigerant mixtures
- Source :
- Journal of Thermal Analysis and Calorimetry. 141:2201-2210
- Publication Year :
- 2020
- Publisher :
- Springer Science and Business Media LLC, 2020.
-
Abstract
- R1234yf is considered as a better alternative for R134a (the conventional refrigerant) due to its low global warming potential value, while its usage is limited because of its flammability. The flammability of any flammable refrigerant can be reduced by adding dilutants that are inert. Two methods (group contribution method and thermal balance method) were used to estimate the minimum inerting concentration (which decides the flammability zone) of the binary mixtures (refrigerant + dilutant). It was observed that the group contribution method and the thermal balance method predicted minimum inerting concentration of the refrigerant mixture (refrigerant + dilutant) with an absolute error of more than 50% and 8%, respectively. Therefore, a modified thermal balance method is proposed in this study to estimate the minimum inerting concentration and found that the proposed method predicts the values with reasonable accuracy when compared with the available experimental data. Further, the minimum inerting concentration for the dilutants R125 and R245fa (that are not experimentally known) with R1234yf is estimated. The results indicated that R227ea has better inert effect with R1234yf when compared to other dilutants (R125, R134a and R245fa) considered in this study. It was also found that the critical inerting concentration for R1234yf is 36.5%.
- Subjects :
- Inert
Flammable liquid
Materials science
Thermodynamics
02 engineering and technology
021001 nanoscience & nanotechnology
Condensed Matter Physics
01 natural sciences
Group contribution method
010406 physical chemistry
0104 chemical sciences
Refrigerant
chemistry.chemical_compound
chemistry
Approximation error
Physical and Theoretical Chemistry
0210 nano-technology
Thermal balance
Global-warming potential
Flammability
Subjects
Details
- ISSN :
- 15882926 and 13886150
- Volume :
- 141
- Database :
- OpenAIRE
- Journal :
- Journal of Thermal Analysis and Calorimetry
- Accession number :
- edsair.doi...........5b8726735b8ff879ec6dc33553526311