Flow boiling heat transfer with HFC mixtures in a smooth horizontal tube. Part I: Experimental investigations

The substitution of working fluids in vapour-compression plants causes major problems, because of a reduced plant performance. Therefore, extremely accurate design procedures are needed, because the relative sizing of each plant-component is essential for the cycle performance. For this reason, the...

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Bibliographic Details
Published in:Experimental thermal and fluid science 2005, Vol.29 (2), p.189-198
Main Authors: Greco, A., Vanoli, G.P.
Format: Article
Language:English
Subjects:
Applied sciences
Convective boiling
Energy
Energy. Thermal use of fuels
Exact sciences and technology
R404A
R410A
Refrigerants
Refrigerating engineering
Refrigerating engineering. Cryogenics. Food conservation
Smooth tube
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Summary:The substitution of working fluids in vapour-compression plants causes major problems, because of a reduced plant performance. Therefore, extremely accurate design procedures are needed, because the relative sizing of each plant-component is essential for the cycle performance. For this reason, the knowledge of the heat-transfer characteristics of new fluids in condensers and evaporators is mandatory. The heat-transfer characteristics of R410A and R404A were experimentally investigated and analyzed as a function of evaporating pressure, heat- and mass flux. The test section was a smooth, horizontal, stainless steel tube (6 mm ID, 6 m length) uniformly heated by the Joule effect. The working parameter was varied within the following ranges: evaporating pressure 3–12 bar, refrigerant mass-flux 290–1100 kg/m 2 s, heat flux 11–39 kW/m 2, respectively.
ISSN:0894-1777
1879-2286
DOI:10.1016/j.expthermflusci.2004.03.003