A study on boiling heat transfer characteristics of refrigerant mixtures in a horizontal tube
dc.contributor.author | Greco, A. | |
dc.date.accessioned | 2014-12-03T08:42:34Z | |
dc.date.available | 2014-12-03T08:42:34Z | |
dc.date.issued | 2007 | |
dc.description.abstract | Paper presented at the 5th International Conference on Heat Transfer, Fluid Mechanics and Thermodynamics, South Africa, 1-4 July, 2007. | en_US |
dc.description.abstract | In the present study the evaporating heat-transfer characteristics of mixtures of refrigerant fluids were analysed. This paper presents experimental heat transfer coefficients obtained during the evaporation of the zeotropic mixtures: R407C (R32-R125-R134a 23- 25-52% in weight) and R417A (R125-R134a-R600 46.6-50-3.4 % in weight) and of the near-azeotropic mixtures: R404A (R125/R143a/R134a 44/52/4 % by weight) and R410A (R32/R125 50/50 % by weight). The test section was a smooth, horizontal, stainless steel tube (6 mm I.D., 6 m length) uniformly heated by Joule effect. The heat transfer characteristics were measured at an evaporation pressure of about 4.00 bar varying the refrigerant mass flux within the range 200-1100 kg/m2s, with heat fluxes within the range 10-15 kW/m2. The experimental data are discussed in terms of the heat transfer coefficients as a function of the vapour quality. The experimental results clearly show that the heat transfer coefficients increase with increasing the refrigerant mass flux with a power coefficient varies in the range 0.57 – 0.86. In the experimental tests R410A shows the higher values of the heat transfer coefficients. In the paper are reported also the pressure drops values for the same experimental data. | en_US |
dc.description.librarian | cs2014 | en_US |
dc.format.extent | 7 pages | en_US |
dc.format.medium | en_US | |
dc.identifier.citation | Greco, A 2007, A study on boiling heat transfer characteristics of refrigerant mixtures in a horizontal tube, Paper presented to the 5th International Conference on Heat Transfer, Fluid Mechanics and Thermodynamics, South Africa, 1-4 July 2007. | en_US |
dc.identifier.isbn | 9781868546435 | |
dc.identifier.uri | http://hdl.handle.net/2263/42779 | |
dc.language.iso | en | en_US |
dc.publisher | International Conference on Heat Transfer, Fluid Mechanics and Thermodynamics | en_US |
dc.relation.ispartof | HEFAT 2007 | |
dc.rights | University of Pretoria | en_US |
dc.rights.uri | University of Pretoria | en_US |
dc.subject | Heat-transfer characteristics of mixtures of refrigerant fluids | en_US |
dc.subject | Evaporation of the zeotropic mixtures | en_US |
dc.title | A study on boiling heat transfer characteristics of refrigerant mixtures in a horizontal tube | en_US |
dc.type | Presentation | en_US |