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Transfert de chaleur expérimental et calculé d’un évaporateur microaileté à tube et à calandre : utilisation du R513A en remplacement immédiat du R134a.

Experimental and calculated heat transfer of a micro-fin shell and tube evaporator: R513A as drop-in replacement for R134a. 

Numéro : 2047

Auteurs : CENSI G., PADOVAN A.

Résumé

The refrigerant mixture R513A is utilised as mid-term replacement for R134a, due to the similar volumetric capacity and relatively low global warming impact. This work compares the heat transfer performances of R134a and R513A in the same direct expansion shell-and-tube evaporator, with micro-fin copper tubes. lt operates in a vapor compression cycle with the possible insertion of an internal liguid-vapor heat exchanger. The working conditions are typical for air conditioning, with outlet water temperature 7 °C, evaporation temperature from 3 to 5 °C, and condensation temperature around 40 °C. Different data points are taken at different values ofthe compressor capacity, ranging from 25 to 100 %. A software simulation is then presented: based on the finite difference method, it uses diff erent literature models for the thermal and hydraulic parameters of the heat exchanger. The calculation procedure is validated with experimental data, showing that it can be used for a predictive analysis of the evaporator parameters.

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Format PDF

Pages : 8

Disponible

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    20 €

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    Gratuit

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Détails

  • Titre original : Experimental and calculated heat transfer of a micro-fin shell and tube evaporator: R513A as drop-in replacement for R134a. 
  • Identifiant de la fiche : 30028926
  • Langues : Anglais
  • Sujet : Alternatives aux HFC
  • Source : 6th IIR Conference on Thermophysical Properties and Transfer Processes of Refrigerants
  • Date d'édition : 01/09/2021
  • DOI : http://dx.doi.org/10.18462/iir.TPTPR.2021.2047
  • Document disponible en consultation à la bibliothèque du siège de l'IIF uniquement.

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