MEASUREMENT AND CORRELATION OF FLOW BOILING HEAT TRANSFER OF R600a/COMPRESSOR OIL SOLUTION INSIDE A HORIZONTAL SMOOTH TUBE
DOI:
https://doi.org/10.15673/0453-8307.4/2014.28052Keywords:
Heat transfer coefficient, Real work fluid, Boiling, Isobutan, Refrigerant/oil solution, Vapor quality, Concentration.Abstract
Experimental results of local heat transfer coefficients for the boiling of real working fluids (solutions of R600a with mineral naphthenic oil ISO VG 15) in smooth tube with small diameter (5.4 mm) are presented. The tests were carried out for the inlet pressure in the range from 71.1 kPa to 77.9 kPa, heat flux was 3800 W/m2, and mass velocity of working fluid was from 14.75 to 18.36 kg/(m2s). The quantitative estimation in reduction of heat transfer coefficient of the wetted surface in evaporator at high oil concentration in the mixture is made. The influence of mass velocities of the working fluid on the values of the local heat transfer coefficients are analyzed. Based on the results obtained it was observed that increasing mass velocity leads to increase the local heat transfer coefficient of RWF both on side of wetted perimeter and vapor phase. The equation for the modeling of the local heat transfer coefficient for boiling of isobutane/compressor oil solution flow in the pipe is suggested.
References
REFERENCES
Zhelezny V. P., Melnyk A. V. The boiling of the R600a/mineral oil ISO VG 15 solution in smooth tube // Vestnik МАХ. — 2014. — v. 2. — p. 13–19.
Wei W., Ding G., Hu H. Influence of lubricant oil on heat transfer performance of refrigerant flow boiling inside small diameter tubes. Part 1: Experimental study. // Experimental Thermal and Fluid Science. — 2007. — v 32. — p. 67–76.
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Zhelezny V. P., Nichenko S. V., Semenyuk Yu. V., Skripov P. V. Experimental investigation of the enthalpy of isobutane−compressor oil solutions // J. Chem. Eng. Data. — 2010. — v 55. — p. 1322–1326.
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Thome J. R. Engineering Data Book III, Wolverine Tube Inc., 2004, Available at: http://www.wlv.com/products/databook/db3/DataBookIII.pdf.
Пристатейна бібліографія
Zhelezny V. P., Melnyk A. V. The boiling of the R600a/mineral oil ISO VG 15 solution in smooth tube // Vestnik МАХ. — 2014. — v. 2. — p. 13–19.
Wei W., Ding G., Hu H. Influence of lubricant oil on heat transfer performance of refrigerant flow boiling inside small diameter tubes. Part 1: Experimental study. // Experimental Thermal and Fluid Science. — 2007. — v 32. — p. 67–76.
Kattan N., Thome J. R., Favrat D. Flow boiling in horizontal tubes: Part 1 – development of a diabatic two-phase flow pattern map // J. of heat transfer-Trans. of the ASME. – 1998a. – v 120. – p. 140-147.
Cooper M. G. Saturation nucleate pool boiling e a simple correlation // Int. Chem. Eng. Symp. Ser. — 1984. — v.86. — p. 785 — 792.
Semenyuk Yu. V, Sechenyh V. V., Zhelezny, V. P., Skripov, V.P. Thermophysical properties of compressor oils for refrigerating plant // Journal of Synthetic Lubrication. — 2008. — v.25. p. 57–73.
Ivanov, О. P. Experimental investigation the heat transfer of the refrigerant/oil solution at the pool boiling process // Holodilnaya tehnika. — 1965. — v3. — p. 32–35.
Dittus F. W., Boelter, L. M. Heat transfer if automobile radiators of the tubular type, University in California. Publications in Engineering. — 1930. — v. 2. — p. 443 – 461.
Zhelezny V. P., Nichenko S. V., Semenyuk Yu. V., Skripov P. V. Experimental investigation of the enthalpy of isobutane−compressor oil solutions // J. Chem. Eng. Data. — 2010. — v 55. — p. 1322–1326.
Influence of compressor oil admixtures on thermodynamic efficiency of compressor system: proc. 5-th international conference [“Compressors – 2006”], (Papiernička, Slovak Republic, 2006), International Institute of Refrigeration, Papiernička, 785 p.
Thome J. R. Engineering Data Book III, Wolverine Tube Inc., 2004, Available at: http://www.wlv.com/products/databook/db3/DataBookIII.pdf.
