Acoustic determination of thermophysical properties and critical parameters for R404A and critical line of x CO2+(1− x) R404A
Autor(a) principal: | |
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Data de Publicação: | 2006 |
Outros Autores: | , , , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
Texto Completo: | http://hdl.handle.net/10400.13/3912 |
Resumo: | The thermophysical properties and critical parameters for the alternative refrigerant R404A (52 wt % of 1,1,1- trifluoroethane (R143a) + 44 wt % of pentafluoroethane (R125) + 4 wt % of 1,1,1,2-tetrafluoroethane (R134a)) were investigated using two different acoustic techniques. The critical behavior of the system xCO2 + (1 - x)R404A was also investigated. Experimental data of speed of sound in liquid R404A from 258 K to 338 K and pressures up to 65 MPa were measured using a pulse-echo method. Derived thermodynamic properties are calculated, combining our experimental data with density and isobaric heat capacity values published by other authors. Measurements of the critical temperature Tc and pressure pc on (R404A) and mixtures of xCO2 + (1 - x)R404A were performed using another simple ultrasonic time-delay technique. The binary critical line was determined over the whole composition range showing that this system deviates only slightly from ideality since the critical line is a continuous line. The Peng-Robinson equation of state with conventional mixing and combining rules was used to correlate the binary experimental data. |
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Acoustic determination of thermophysical properties and critical parameters for R404A and critical line of x CO2+(1− x) R404AR404AxCO2 + (1 - x)R404AAcoustic determinationThermophysical propertiesCritical parameters.Faculdade de Ciências Exatas e da EngenhariaThe thermophysical properties and critical parameters for the alternative refrigerant R404A (52 wt % of 1,1,1- trifluoroethane (R143a) + 44 wt % of pentafluoroethane (R125) + 4 wt % of 1,1,1,2-tetrafluoroethane (R134a)) were investigated using two different acoustic techniques. The critical behavior of the system xCO2 + (1 - x)R404A was also investigated. Experimental data of speed of sound in liquid R404A from 258 K to 338 K and pressures up to 65 MPa were measured using a pulse-echo method. Derived thermodynamic properties are calculated, combining our experimental data with density and isobaric heat capacity values published by other authors. Measurements of the critical temperature Tc and pressure pc on (R404A) and mixtures of xCO2 + (1 - x)R404A were performed using another simple ultrasonic time-delay technique. The binary critical line was determined over the whole composition range showing that this system deviates only slightly from ideality since the critical line is a continuous line. The Peng-Robinson equation of state with conventional mixing and combining rules was used to correlate the binary experimental data.American Chemical SocietyDigitUMaEsperança, José M. S. S.Pires, Pedro F.Guedes, Henrique J. R.Ribeiro, NunoCosta, TâniaAguiar-Ricardo, Ana2021-12-15T12:16:45Z20062006-01-01T00:00:00Zinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleapplication/pdfhttp://hdl.handle.net/10400.13/3912engEsperança, J. M., Pires, P. F., Guedes, H. J., Ribeiro, N., Costa, T., & Aguiar-Ricardo, A. (2006). Acoustic determination of thermophysical properties and critical parameters for R404A and critical line of x CO2+(1− x) R404A. Journal of Chemical & Engineering Data, 51(3), 1148-1155. https://doi.org/10.1021/je060070710.1021/je0600707info:eu-repo/semantics/openAccessreponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãoinstacron:RCAAP2023-03-26T03:39:40ZPortal AgregadorONG |
dc.title.none.fl_str_mv |
Acoustic determination of thermophysical properties and critical parameters for R404A and critical line of x CO2+(1− x) R404A |
title |
Acoustic determination of thermophysical properties and critical parameters for R404A and critical line of x CO2+(1− x) R404A |
spellingShingle |
Acoustic determination of thermophysical properties and critical parameters for R404A and critical line of x CO2+(1− x) R404A Esperança, José M. S. S. R404A xCO2 + (1 - x)R404A Acoustic determination Thermophysical properties Critical parameters . Faculdade de Ciências Exatas e da Engenharia |
title_short |
Acoustic determination of thermophysical properties and critical parameters for R404A and critical line of x CO2+(1− x) R404A |
title_full |
Acoustic determination of thermophysical properties and critical parameters for R404A and critical line of x CO2+(1− x) R404A |
title_fullStr |
Acoustic determination of thermophysical properties and critical parameters for R404A and critical line of x CO2+(1− x) R404A |
title_full_unstemmed |
Acoustic determination of thermophysical properties and critical parameters for R404A and critical line of x CO2+(1− x) R404A |
title_sort |
Acoustic determination of thermophysical properties and critical parameters for R404A and critical line of x CO2+(1− x) R404A |
author |
Esperança, José M. S. S. |
author_facet |
Esperança, José M. S. S. Pires, Pedro F. Guedes, Henrique J. R. Ribeiro, Nuno Costa, Tânia Aguiar-Ricardo, Ana |
author_role |
author |
author2 |
Pires, Pedro F. Guedes, Henrique J. R. Ribeiro, Nuno Costa, Tânia Aguiar-Ricardo, Ana |
author2_role |
author author author author author |
dc.contributor.none.fl_str_mv |
DigitUMa |
dc.contributor.author.fl_str_mv |
Esperança, José M. S. S. Pires, Pedro F. Guedes, Henrique J. R. Ribeiro, Nuno Costa, Tânia Aguiar-Ricardo, Ana |
dc.subject.por.fl_str_mv |
R404A xCO2 + (1 - x)R404A Acoustic determination Thermophysical properties Critical parameters . Faculdade de Ciências Exatas e da Engenharia |
topic |
R404A xCO2 + (1 - x)R404A Acoustic determination Thermophysical properties Critical parameters . Faculdade de Ciências Exatas e da Engenharia |
description |
The thermophysical properties and critical parameters for the alternative refrigerant R404A (52 wt % of 1,1,1- trifluoroethane (R143a) + 44 wt % of pentafluoroethane (R125) + 4 wt % of 1,1,1,2-tetrafluoroethane (R134a)) were investigated using two different acoustic techniques. The critical behavior of the system xCO2 + (1 - x)R404A was also investigated. Experimental data of speed of sound in liquid R404A from 258 K to 338 K and pressures up to 65 MPa were measured using a pulse-echo method. Derived thermodynamic properties are calculated, combining our experimental data with density and isobaric heat capacity values published by other authors. Measurements of the critical temperature Tc and pressure pc on (R404A) and mixtures of xCO2 + (1 - x)R404A were performed using another simple ultrasonic time-delay technique. The binary critical line was determined over the whole composition range showing that this system deviates only slightly from ideality since the critical line is a continuous line. The Peng-Robinson equation of state with conventional mixing and combining rules was used to correlate the binary experimental data. |
publishDate |
2006 |
dc.date.none.fl_str_mv |
2006 2006-01-01T00:00:00Z 2021-12-15T12:16:45Z |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/article |
format |
article |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
http://hdl.handle.net/10400.13/3912 |
url |
http://hdl.handle.net/10400.13/3912 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
Esperança, J. M., Pires, P. F., Guedes, H. J., Ribeiro, N., Costa, T., & Aguiar-Ricardo, A. (2006). Acoustic determination of thermophysical properties and critical parameters for R404A and critical line of x CO2+(1− x) R404A. Journal of Chemical & Engineering Data, 51(3), 1148-1155. https://doi.org/10.1021/je0600707 10.1021/je0600707 |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
application/pdf |
dc.publisher.none.fl_str_mv |
American Chemical Society |
publisher.none.fl_str_mv |
American Chemical Society |
dc.source.none.fl_str_mv |
reponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação instacron:RCAAP |
instname_str |
Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação |
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RCAAP |
institution |
RCAAP |
reponame_str |
Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
collection |
Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
repository.name.fl_str_mv |
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repository.mail.fl_str_mv |
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