Document IIF
Comparaison expérimentale de la performance du transfert de chaleur du R134a et du R1234ze(E) dans un évaporateur à film hybride.
Experimental comparison of the heat transfer performance of R134a and R1234ze(E) in a hybrid film evaporator.
Numéro : pap. n. 1431
Auteurs : CENSI G., GIANCOTTI L., PADOVAN A.
Résumé
Environmental and cost issues in vapour compression systems call for new high efficiency evaporators with reduced refrigerant charge. This paper presents a new concept of shell-and-tube heat exchanger, named hybrid film evaporator. In this, a liquid film falls down from the top to the bottom and it is re-distributed on each row of tubes by means of special drilled plates. The heat transfer mechanism is a combination of falling film evaporation and pool boiling. When compared to a flooded evaporator, the refrigerant charge is significantly lower, almost 40% for the entire chiller, while maintaining the same heat transfer capacity and overall dimensions. The experimental heat transfer performances of a hybrid film evaporator prototype, working with R134a and R1234ze(E), are presented and discussed. The results show that nucleate boiling is not the only heat transfer mechanism and, at the same heat flux, the measured heat transfer coefficient of R1234ze(E) is even 20% lower than that of R134a.
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Détails
- Titre original : Experimental comparison of the heat transfer performance of R134a and R1234ze(E) in a hybrid film evaporator.
- Identifiant de la fiche : 30026755
- Langues : Anglais
- Source : Proceedings of the 25th IIR International Congress of Refrigeration: Montréal , Canada, August 24-30, 2019.
- Date d'édition : 24/08/2019
- DOI : http://dx.doi.org/10.18462/iir.icr.2019.1431
- Notes :
Keynote
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Indexation
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Heat transfer analysis of R134a, R1234ze(E) and...
- Auteurs : CENSI G., PADOVAN A.
- Date : 21/08/2023
- Langues : Anglais
- Source : Proceedings of the 26th IIR International Congress of Refrigeration: Paris , France, August 21-25, 2023.
- Formats : PDF
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Experimental study of falling film evaporation ...
- Auteurs : CENSI G., PADOVAN A.
- Date : 2022
- Langues : Anglais
- Source : 2022 Purdue Conferences. 19th International Refrigeration and Air-Conditioning Conference at Purdue.
- Formats : PDF
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Heat transfer enhancement of falling film evapo...
- Auteurs : UBARA T., SUGIMOTO K.
- Date : 05/2021
- Langues : Anglais
- Source : 2021 Purdue Conferences. 18th International Refrigeration and Air-Conditioning Conference at Purdue.
- Formats : PDF
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Effects of tube shape on boiling heat transfer ...
- Auteurs : FUKUDA S., SHIMIZU Y., MIYOSHI N., HASEGAWA Y.
- Date : 31/08/2021
- Langues : Anglais
- Source : 13th IEA Heat Pump Conference 2021: Heat Pumps – Mission for the Green World. Conference proceedings [full papers]
- Formats : PDF
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Falling film evaporation and pool boiling of HF...
- Auteurs : UBARA T., SAWATARI K., SUGIMOTO K., ASANO H.
- Date : 06/2021
- Langues : Anglais
- Source : 2nd IIR Conference on HFO Refrigerants and Low GWP Blends
- Formats : PDF
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