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Propriétés et performance du cycle des mélanges de frigorigènes fonctionnant près et au-dessus du point critique. Tâche 1. Propriétés des frigorigènes. Rapport final + annexes.

Properties and cycle performance of refrigerant blends operating near and above the refrigerant critical point. Task 1. Refrigerant properties. Final report + appendixes.

Auteurs : MCLINDEN M. O., LAESECKE A., LEMMON E. W., et al.

Type de monographie : Rapport

Résumé

This project has measured data and developed models for the properties of R410A and other HFC blends. An emphasis was placed on conditions near and above the mixture critical point (conditions where existing data were scarce and where a serious degradation in the performance of air-conditioning equipment has been observed). Many of the HFC blends have much lower critical temperatures than the CFCs or HCFCs (primarily R22) they are replacing, meaning that the operating temperatures of equipment using the blends can approach the critical temperature in extreme ambient conditions. Extract from the table of contents: R125 heat capacity measurements and equation of state; mixture pressure, density, temperature and heat capacity measurements; mixture viscosity measurements; appendix A: equation of state for pentafluoroethane HFC-125 for temperatures from the triple point (172.52 K) to 500 K and pressures to 60 MPa; appendix B: equations of state for mixtures of R32, R125, R134a and R152a. The report can be downloaded from the Web site: www.arti-21cr.org/research/completed/index.html.

Détails

  • Titre original : Properties and cycle performance of refrigerant blends operating near and above the refrigerant critical point. Task 1. Refrigerant properties. Final report + appendixes.
  • Identifiant de la fiche : 2004-3069
  • Langues : Anglais
  • Sujet : Alternatives aux HFC
  • Édition : Us department of commerce, ntis (national technical information service) - États-unis/États-unis
  • Date d'édition : 08/2002
  • Source : Source : ARTI-21CR-605-50010-01; 98 + 59 + 50 p. (21 x 29.7); fig.; tabl.; ref.; append.

Indexation