Journal
EXPERIMENTAL THERMAL AND FLUID SCIENCE
Volume 29, Issue 2, Pages 189-198Publisher
ELSEVIER SCIENCE INC
DOI: 10.1016/j.expthermflusci.2004.03.003
Keywords
convective boiling; R404A; R410A; smooth tube
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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 1D, 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 k-W/m(2), respectively. (C) 2004 Elsevier Inc. All rights reserved.
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