Title of article :
A minichannel aluminium tube heat exchanger – Part I: Evaluation of single-phase heat transfer coefficients by the Wilson plot method
Author/Authors :
Fernando، نويسنده , , Primal and Palm، نويسنده , , Bjِrn and Ameel، نويسنده , , Tim and Lundqvist، نويسنده , , Per and Granryd، نويسنده , , Eric، نويسنده ,
Issue Information :
روزنامه با شماره پیاپی سال 2008
Pages :
12
From page :
669
To page :
680
Abstract :
A prototype liquid-to-refrigerant heat exchanger was developed with the aim of minimizing the refrigerant charge in small systems. To allow correct calculation of the refrigerant side heat transfer, the heat exchanger was first tested for liquid-to-liquid (water-to-water) operation in order to determine the single-phase heat transfer performance. These single-phase tests are reported in this paper. The heat exchanger was made from extruded multiport aluminium tubes and was designed similar to a shell-and-tube heat exchanger. The heat transfer areas of the shell-side and tube-side were approximately 0.82 m2 and 0.78 m2, respectively. There were six rectangular-shaped parallel channels in a tube. The hydraulic diameter of the tube-side was 1.42 mm and of the shell-side 3.62 mm. Tests were conducted with varying water flow rates, temperature levels and heat fluxes on both the tube and shell sides at Reynolds numbers of approximately 170–6000 on the tube-side and 1000–5000 on the shell-side, respectively. The Wilson plot method was employed to investigate the heat transfer on both the shell and tube sides. In the Reynolds number range of 2300–6000, it was found that the Nusselt numbers agreed with those predicted by the Gnielinski correlation within ±5% accuracy. In the Reynolds number range of 170–1200 the Nusselt numbers gradually increased from 2.1 to 3.7. None of the previously reported correlations for laminar flow predicted the Nusselt numbers well in this range. The shell-side Nusselt numbers were found to be considerably higher than those predicted by correlations from the literature.
Keywords :
Heat Exchanger , Frigorifique , EAU , Aluminium , Laminaire , Experiment , Nusselt , Flow , heat transfer , Aluminium , Nusselt , Expérimentation , ةchangeur de chaleur , LAMINAR , Micro-canal , water , Minichannel , ةcoulement , Refrigerated , Transfert de chaleur
Journal title :
International Journal of Refrigeration
Serial Year :
2008
Journal title :
International Journal of Refrigeration
Record number :
1341765
Link To Document :
بازگشت