Flow and pressure drop characteristics of R22 in adiabatic capillary tubes
The objective of this study is to present flow and pressure drop characteristics of R22 in adiabatic capillary tubes of inner diameters of 1.2 to 2.0 mm, and tube lengths of 500 to 2000 mm. Distributions of temperature and pressure along capillary tubes and the refrigerant flow rates through the tubes were measured for several condensing temperatures and various degrees of subcooling at the capillary tube inlet. Condensing temperatures of R22 were selected as 40, 45, and 50°C at the capillary tube inlet, and the degree of subcooling was adjusted to 1 to 18°C. Experimental results including mass flow rates and pressure drops of R22 in capillary tubes were provided. A new correlation based on Buckingham π theorem to predict the mass flow rate through the capillary tube was presented considering major parameters which affect the flow and pressure drop characteristics.
- ASHRAE. 1994.ASHRAE Handbook-Refrigeration. Atlanta: ASHRAE.
- Bittle, R. R., Wolf, D. A. and Pate, M. B., 1998, “A Generalized Performance Method for Adiabatic Capillary Tubes,”HVAC & R Research, Vol. 4, No. 1, pp. 27–43.
- Bolstad, M. M., and Jordan, R. C., 1948, “Theory and Use of the Capillary Tube Expansion Device,”Refrigerating Engineering, Vol. 56, No. 12, pp. 519–523.
- Chang, S. D., and Ro, S. T., 1996a, “Pressure Drop of Pure HFC Refrigerants and Their Mixtures Flowing in Capillary Tubes,”Int. J. Multiphase Flow, Vol. 22, No. 3, pp. 551–561. CrossRef
- Chang, S. D., and Ro, S. T., 1996b, “Flow Characteristics of Refrigerant Mixtures with R32 in a Capillary Tube,”Korean Journal of Air-Conditioning and Refrigeration Engineering, Vol. 8, No. 2, pp. 177–186.
- Chen, S. L., Chen, Y. R., Liu, C. H., and Jwo, C. S., 2000, “Simulation of Refrigerants Flowing Through Adiabatic Capillary tubes,”HVAC & R Research, Vol. 6, No. 2, pp. 101–115.
- Chen, Z. H., Li, R. Y., Lin, S., and Chen, Z. Y., 1990, “A Correlation for Metastable Flow of Refrigerant 12 through Capillary Tubes,”ASHRAE Trans., Vol. 96, No. 1, pp. 550–554.
- Collier, J. G., and Thome, J. R., 1996,Convective Boiling and Condensation 3rd ed., Oxford University Press Inc., New York.
- Cooper, L., Chu, C. K., and Brisken, W. R., 1957, “Simple Selection Method for Capillary Derived from Physical Flow Condition,”Refrigerating Engineering, Vol. 65, No. 7, pp. 37–107.
- Huber, M., Gallagher, J., McLinden, M., and Morrison, G., 1996,NIST Thermodynamic Properties of Refrigerants and Refrigerant Mixtures (REFPROP), Ver. 5.0, National Institute of Standards and Technology, Gaithersburg, Maryland., U. S. A.
- Huerta, A. S., and Silvares, O. M., 1998, “Simulation of the Effects of Oil in Capillary Tubes Considering a Separated Flow Model,”Proc. of Int. Refrig. Conf. Purdue University, West Lafayette, Indiana, U. S. A., pp. 443–448.
- Kim, S. G., Kim, M. S., Ro, S. T., and Youn, B., 1997, “Performance Characteristics of R-22 and R-407C in a Capillary Tube of Air-conditioner,”Proc. of 10th Int. Symp. Transport Phenomena (ISTP-10), Nov. 30-Dec. 3, Kyoto, Japan, Vol. 2, pp. 547–551.
- Kim, Y. C., and Choi, J. M., 1998, “Comparison of Refrigerant Flow through Capillary with Short Tube Orifice,”Korean Journal of Air-Conditioning and Refrigeration Engineering, Vol. 10, No. 1, pp. 118–128.
- Koizumi, H., and Yokoyama, K., 1980, “Characteristics of Refrigerant Flow in a Capillary Tube,”ASHRAE Trans., Vol. 86, No. 2, pp. 19–27.
- Kuehl, S. J., and Goldschmidt, V. W., 1990, “Steady Flows of R-22 Through Capillary Tubes: Test Data,”ASHRAE Trans., Vol. 96, No. 1, pp. 719–728.
- Kuehl, S. J., and Goldschmidt, V. W., 1991, “Modeling of Steady Flows of R-22 Through Capillary Tubes,”ASHRAE Trans., Vol. 97, No. 1, pp. 139–148.
- Li, R. Y., Lin, S., Chen, Z. Y., and Chen, Z. H., 1990, “Metastable Flow of R12 through Capillary Tubes,”Int. J. Refrig., Vol. 13, pp. 181–186. CrossRef
- Melo, C., Ferreira, R. T. S., Neto, C. B., Goncalves, J. M., and Thiessen, M. R., 1994, “Experimental Analysis of Capillry Tubes for CFC-12 and HFC-134a,” Proc. of Int. Refrig. Conf. Purdue University, West Lafayette, Indiana, U. S. A., pp. 347–352.
- Meyer, J. J. and Dunn, W. E., 1998, “New Insights into the Behavior of the Metastable Region of an Operating Capillary Tube,”HVAC & R Research, Vol. 4, No. 1, pp. 105–115.
- White, F. M., 1994, Fluid Mechanics, 3rd ed., McGraw-Hill, New York Wijaya, H., 1992, “Adiabatic Capillary Tube Test Data for HFC-134a,” Proc. of Int. Refrig. Conf. Purdue University, West Lafayette, Indiana, U. S. A., Vol. 1, pp. 63–71.
- Flow and pressure drop characteristics of R22 in adiabatic capillary tubes
KSME International Journal
Volume 15, Issue 9 , pp 1328-1338
- Cover Date
- Print ISSN
- Korean Society of Mechanical Engineers
- Additional Links
- Alternative Refrigerant
- Capillary Tube
- Mass Flow Rate
- Pressure Drop
- Industry Sectors