A generalized correlation for the characteristics of adiabatic capillary tubes |
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Authors: | Li Yang Wen Wang |
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Affiliation: | aInstitute of Refrigeration and Cryogenics, School of Mechanics and Power Engineering, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai 200240, China |
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Abstract: | The capillary tube is often served as an expansion device in small refrigeration and air-conditioning systems. In this paper, a generalized correlation for predicting the refrigerant mass flow rate through the adiabatic capillary tube is developed with approximate analytic solutions based on the extensive data for R12, R22, R134a, R290, R600a, R410A, R407C, and R404A, in which a homogeneous equilibrium model for two-phase flow is employed, and there is a subcooled liquid or saturated two-phase mixture at the inlet of the capillary tubes. The collected database about capillary tubes covers the inner diameter from 0.5 mm to 2 mm, the tube length from 0.5 m to 5 m, the condensing temperature from 20 °C to 60 °C, the subcooling from 0 °C to 20 °C, and the quality from 0 to 0.3 at the inlet. Assessments for the correlation are made with some experimental data for R12, R22, R134a, R290, R407C, R410A, and R404A obtained from the open literature and some existing correlations based on the experimental database also. The present correlation yields an average deviation of −0.83% and a standard deviation of 9.02% from the database. |
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Keywords: | Refrigeration system Compression Expansion Tube Capillaire Correlation Flow Refrigerant R12 R22 R134a R290 R407C R410A R404AMots clé s: Systè me frigorifique Systè me à compression Dé tente Tube Capillaire Corré lation Dé bit Frigorigè ne R12 R22 R134a R290 R407C R410A R404A |
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