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Possibilités thermodynamiques et opportunités technologiques pour l'amélioration de la science du froid dans la quête de systèmes thermiques à faible impact sur le réchauffement planétaire.

Thermodynamic possibilities and technological opportunities for improving the science of refrigeration in search for low global warming thermal systems.

Auteurs : HRNJAK P.

Résumé

The request of new low GWP options based on either synthetic (man made) refrigerants or natural (naturally occurring) materials have to offer high efficiency in addition to environmental friendliness and safety for people and property. That situation will open new possibilities for drop in refrigerants along options for natural refrigerants. The paper presents some options from the point of thermodynamic limits and opportunities for new technologies to reach those limits and/or affect some of perceived constraints and discuss experience from immediate past. It is good to remember the recent history from the point of thermodynamic limits and opportunities for new technologies to reach those limits and/or affect some of perceived constraints. This paper presents an overview of expectations as we begin to reconsider CO2 systems versus those using R134a, HFO1234yf and other synthetic refrigerants and discusses the effects of thermodynamic properties on cycle performance and thermophysical considerations on the system. A brief overview of the results of the Alternative Refrigerant Cooperative Research Program (CRP) of SAE International [probably the most comprehensive and fair experimental comparative analysis for mobile air-conditioning (MAC) systems] is used as an illustration of the approach and provides real results. The paper also presents the influence of the development of CO2 technologies on R134a and other systems, i.e. transfer of technology. Finally, the paper presents the progression of MAC system performance with the clear statement that the differences among refrigerants in same-size systems were significantly smaller than the improvement of all systems indicating that similar situation is to be expected to continue. Regardless of the outcome, the beneficiaries of the competition are the entire professional community and humanity as a whole.

Détails

  • Titre original : Thermodynamic possibilities and technological opportunities for improving the science of refrigeration in search for low global warming thermal systems.
  • Identifiant de la fiche : 2011-0028
  • Langues : Anglais
  • Source : Measures to address climate change. 2010 International Symposium on Next-generation Air Conditioning and Refrigeration Technology: February 17-19, Tokyo, Japan.
  • Date d'édition : 17/02/2010

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