Résumé
This is the 16 slide PowerPoint presentation of Kondou and Koyama's paper on evaporation heat transfer of R1123/R32 flow.
A binary mixture R1123/R32 is anticipated as the new candidate to replace R410A and R32 for residential air conditioners. In this study, the experimentally quantified heat transfer coefficient and pressure drop during evaporation process in a horizontal microfin tube with an outer diameter of 6 mm is presented. The number of fins, fin height, spiral angle, and surface enlargement of the tested tube are 60, 0.269 mm, 18 deg, and 2.62, respectively. The heat transfer coefficient at a composition of 40/60 mass%, a temperature of 10 °C, and a mass flux of 200 kg m-2s-1 is almost comparable to that of R32; on the other hand, the pressure drop is somewhat lower. That is explained with the smaller surface tension and lower vapor velocity. The temperature glide is approximately 1 K at the corresponding pressure. It seems that the concerned mass transfer resistance by the volatility difference is relatively small.
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Détails
- Titre original : Evaporation heat transfer of HFO-1123/HFC-32 (40/60 mass%) flow in a horizontal microfin tube.
- Identifiant de la fiche : 30024940
- Langues : Anglais
- Source : 1st IIR international conference on the application of HFO refrigerants, Birmingham, September 2-5 2018.
- Date d'édition : 09/2018
Liens
- Voir aussi : Evaporation heat transfer of HFO-1123/HFC-32 (40/60 mass%) flow in a horizontal microfin tube.
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Indexation
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Thèmes :
HFC;
Transfert de chaleur;
Mélanges - Mots-clés : Tube horizontal; Coefficient de transfert de chaleur; Tube microailette; R32; R1123; Mélange; HFO; Experimentation; Évaporation; Chute de pression
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Evaporation heat transfer of HFO-1123/HFC-32 (4...
- Auteurs : KONDOU C., KOYAMA S.
- Date : 09/2018
- Langues : Anglais
- Source : 1st IIR international conference on the application of HFO refrigerants, Birmingham, September 2-5 2018.
- Formats : PDF
Voir la fiche
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Heat transfer and pressure drop of R1123/R32 fl...
- Auteurs : KONDOU C., KOYAMA S.
- Date : 09/07/2018
- Langues : Anglais
- Source : 2018 Purdue Conferences. 17th International Refrigeration and Air-Conditioning Conference at Purdue.
- Formats : PDF
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Comparison of condensation heat transfer and pr...
- Auteurs : MATTY E. P., FRONK B. M.
- Date : 05/2021
- Langues : Anglais
- Source : 2021 Purdue Conferences. 18th International Refrigeration and Air-Conditioning Conference at Purdue.
- Formats : PDF
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Experiments on condensation heat transfer of te...
- Auteurs : JIGE D., MIKAJIRI N., NOBUNAGA M., INOUE N.
- Date : 06/2021
- Langues : Anglais
- Source : 2nd IIR Conference on HFO Refrigerants and Low GWP Blends
- Formats : PDF
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Evaporation heat transfer and pressure drop of ...
- Auteurs : JIGE D., INOUE N., KOYAMA S.
- Date : 23/04/2017
- Langues : Anglais
- Source : 5th IIR Conference on Thermophysical Properties and Transfer Processes of Refrigerants.
- Formats : PDF
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