EVAPORATIVE HEAT TRANSFER AND PRESSURE DROP OF R410A AND R32 IN SMOOTH HORIZONTAL TUBE

Flow boiling heat transfer of R410A and R32 inside a smooth horizontal tube whose hydraulic diameters are 5,6 and 7mm. The mass flux was varied from 100 to 400 , heat flux from 5 to 15 , as the saturation temperature were maintained at -30 °C and -40 °C. The effects of the imposed wall heat flux, mass flux, vapor quality on the evaporation heat transfer and pressure drop discussed as a function of vapor quality and tube length. The results from Matlab program are compared with experimental data.

Keywords:

R410, A R32, heat transfer pressure drop, horizontal tube.,

PDF

___

[1] Chang, Y.J. Chiang, S.K. Chung, T.W. Wang, C.C. Two-phase frictional characteristics of R410A and air-water in a 5 mm smooth tube, ASHREA Trans. 106 (1) (2000) 792-797.
[2] Choi K.I., Pamitran, J.T. Oh, Boiling heat transfer of R410Ain horizontal small diameter tubes, Proceedings of 2002 winter annual conference, The Society of Air-Conditioning and Refrigerating Engineers of Korea, (2002), [p.283-288].
[3] Ebisu, T. Torikoshi, K. Heat transfer characteristics and correlations for R410A flowing inside a horizontal smooth tube, ASHREA Trans. 104 (2) (1998), 556-561.
[4] Greco A., Vanoli,G.P., Flow boiling heat transfer with HFC mixtures in a smooth horizonal tube,Experimental Thermal Fluid Science 29 (2005), 716-730.
[5] Gungor, K.E., Winterton, R.H.S. A general correlation for flow boiling in tubes and annuli, Int. J. Heat and Mass Transfer 29 (1986), 351-358.
[6] Jatuporn Kaew-On, Experimental investigation of evaporation heat transfer coefficient and pressure drop of R410A in a multiport mini-channels. International Journal of Refrigeration 32 (2009), 124-127.
[7] Kim, Y. Seo, K.Chung, J.T. evaporation heat transfer characteristics of R410A in 7 adn 9.52 mm smooth/micro-fin tubes, Int. J. Refrigeration 25 (2002), 716-730.
[8] Lockhart, R.W. Martinelli, R.C. Proposed correlation of data for isothermal two-phase two-component flow in pipes, Chem. Eng. Prog. 45 (1945), 39-45.
[9] Park, C.Y. Hrnjak, P.S. CO2 and R410A flow boiling heat transfer, pressure drop, and flow pattern at low temperatures in a horizonal smooth tubes. International Journal of Refrigeration 30 (2007), 166-178.
[10] Yun,R., Heo, J.H., Kim, Y., Evaporative heat transfer and pressure drop of R410A in micro-channels. International Journal of Refrigeration 29 (2006), 92-100.

Sigma Mühendislik ve Fen Bilimleri Dergisi-Cover

ISSN: 1304-7191
Yayın Aralığı: Yılda 4 Sayı
Yayıncı: Yıldız Teknik Üniversitesi

Arşiv