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An experimental flow analysis of R 410A through adiabatic and non-adiabatic helical capillary tubes

Professor, Department of Mechanical Engineering, Krishna Chaitanya Institute of Technology & Sciences, Markapur.

Periodicity:May - July'2012
DOI : https://doi.org/10.26634/jme.2.3.1870

Abstract

The performance of vapor compression refrigeration system depends on the individual performance of its type, components and quantity of the refrigerant. In this regard the design of capillary tube used as an expansion device requires proper attention for better design, control and operation of the system. Many researchers have done works on straight capillary tube under homogeneous flow conditions for limited refrigerants without considering coiled effects, separated and non adiabatic conditions. The objective of this work is to estimate the performance of a coiled capillary tube under adiabatic and non-adiabatic, separated flow including metastable conditions. The effect of various design parameters such as tube diameter, coil diameter, subcooling on the flow rate of capillary tube was studied. The experimental results are validated with previous results from developed models & experimental observations and a good agreement was observed. 6 to 15% decrease in mass flow rate of R 410A is noticed in coiled capillary tubes over a range of coil diameters 40-120mm as compared to that of straight capillary tubes under similar operating conditions. The effects of the length of capillary tube on the mass flow rates were studied and it is noticed that there is only a marginal drop in mass flow rates about 1.5% and even smaller beyond 1000 mm length.

Keywords

Capillary Tube, Non-Adiabatic Flow, Refrigerant, Mass Flow Rate.

How to Cite this Article?

V. Krishna Reddy (2012). An Experimental Flow Analysis Of R 410a Through Adiabatic And Non-Adiabatic Helical Capillary Tubes. i-manager’s Journal on Mechanical Engineering, 2(3), 45-52. https://doi.org/10.26634/jme.2.3.1870

References

[1]. Ali, M.E. (1998). Laminar natural convection from constant heat flux helical coiled tubes, International Journal of Heat and Mass transfer, 41, 2175-2182.

[2]. Bansal, P.K., and A.S., Rupasinghe, (1998). A homogeneous model for adiabatic capillary tubes, Applied Thermal Engineering. 18, 207-219.

[3]. Bolstad, M.M., Jordan, R.C. (1948). Theory and use of the capillary tube expansion device, Refrigerating Eng. 56, 577–583.

[4]. Fioreli Sanzoo, F.A., Alex Alberto, (2002). Experimental analysis of refrigerant mixtures flow through adiabatic capillary tubes, Experimental Thermal and Fluid science, 26, 499-512.

[5]. Kim, S.G., M.S., Kim, S.T., Ro, (2002). Experimental Investigation of the performance of R22, R407C and R410A in several capillary tubes for air-conditioners. International journal of Refrigeration, 25, 521-531.

[6]. Marcy, G.P. (1949). Pressure drop with change of phase in a capillary tube, Refrigerating Eng. 24, 53– 57.

[7]. Melo, C., R.T.S., Ferreira, R.H., Pereira, (1992). Modeling adiabatic capillary tubes: A critical analysis, Proceedings International Refrigeration Conference, Purdue University. 353-358.

[8]. Motta, S.Y., S.L., Braga, J.A.R., Parise, (2002). A visual study of R404A/Oil flow through adiabatic capillary tubes, International Journal of Refrigeration, 25, 586-596.

[9]. Mutalubi Aremu. (2007). Effect of Coiled Capillary tube pitch on Vapor Compression Refrigeration System Performance, AU J.T. 11(1), 14-22.

[10]. Paliwal, H.K., S., Gupta, K., Kanth, (2001). A flow model for helical capillary tubes for refrigeration systems, Proceedings International conference on emerging technologies in air-conditioning and refrigeration, New Delhi, 409-419.

[11]. Pate M.B., D.R. Tree, (1984). An analysis of pressure and temperature measurements along a capillary tube – suction line heat exchanger, ASHRAE Trans. 90, 291–301.

[12]. Zhou G., Y. Zhang. (2006). Numerical and experimental investigations on the performance of coiled adiabatic capillary tube, Applied Thermal Eng. 26, 1106 –1111.

[13]. http://www.ozonecell.com/viewsection.jsp? lang = 0 & id=0,166,399

[14]. www.berr.gov.uk/files/file29101.pdf

[15]. http://www.ozonecell.com/viewsection.jsp?lang= 0&id =0,166,216

[16]. http://www.epa.gov/Ozone/title6/phaseout/22 phaseout.html

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