Summary
In this study, external condensation heat transfer coefficients (HTCs) of six flammable refrigerants of propylene (R1270), propane (R290), isobutane (R600a), butane (R600), dimethylether (RE170), and HFC32 were measured at the vapor temperature of 39 °C on a plain tube of 19.0 mm outside diameter with a wall subcooling. Test results showed a typical trend that external condensation HTCs decrease with the wall subcooling. No unusual behavior or phenomenon was observed for these flammable refrigerants during experiments. HFC32 and DME showed 28-44% higher HTCs than those of HCFC22 due to their excellent thermophysical properties. Propylene and butane showed the similar HTCs as those of HCFC22 while propane and isobutane showed 9% lower HTCs than those of HCFC22. Finally, a general correlation was made by modifying Nusselt's equation based upon the measured data of eleven fluids of various vapour pressures including halogenated refrigerants. The general equation showed an excellent agreement with all data exhibiting a deviation of less than 3%.
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Details
- Original title: Condensation heat transfer coefficients of flammable refrigerants.
- Record ID : 2004-1021
- Languages: English
- Source: International Journal of Refrigeration - Revue Internationale du Froid - vol. 27 - n. 3
- Publication date: 2004/05
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Indexing
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Themes:
HFCs;
Hydrocarbons - Keywords: Propylene; Isobutane; Horizontal tube; Heat transfer coefficient; Butane; Mass transfer coefficient; R32; Propane; Condensation
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Nucleate boiling heat transfer coefficients of ...
- Author(s) : JUNG D., LEE H., BAE D., et al.
- Date : 2005/05
- Languages : English
- Source: International Journal of Refrigeration - Revue Internationale du Froid - vol. 28 - n. 3
- Formats : PDF
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Refrigeranti idrocarburi: ebollizione nucleata.
- Date : 2006/09
- Languages : Italian
- Source: Zero sotto Zero - n. 6
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Pool boiling heat transfer coefficients of hydr...
- Author(s) : PARK H. S., PARK K. J., JUNG D.
- Date : 2007/08/21
- Languages : English
- Source: ICR 2007. Refrigeration Creates the Future. Proceedings of the 22nd IIR International Congress of Refrigeration.
- Formats : PDF
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Description of the thermodynamic properties of ...
- Author(s) : SALEH B., WEINGERL U., WENDLAND M.
- Date : 2001/10/03
- Languages : English
- Source: Thermophysical Properties and Transfer Processes of New Refrigerants.
- Formats : PDF
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Nucleate boiling heat transfer coefficients of ...
- Author(s) : JUNG D., LEE H., BAE D., et al.
- Date : 2004/06
- Languages : English
- Source: International Journal of Refrigeration - Revue Internationale du Froid - vol. 27 - n. 4
- Formats : PDF
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