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Fast calculation method for modeling non-adiabatic capillary tube.

[In Chinese. / En chinois.]

Author(s) : ZHAO D., DING G., REN T.

Type of article: Article

Summary

To meet the requirements on computation speed, accuracy, application range for modelling non-adiabatic capillary tube for refrigeration system simulation, a fast calculation method for a non-adiabatic capillary tube is proposed. The approximation correlations for thermodynamic properties of refrigerant are proposed for subcooled zone, two-phase zone and superheated zone, respectively, and then the explicit approximate analytic solutions for the three zones are obtained using integral method. In the solution for two-phase zone, approximation correlation for thermodynamic properties is obtained by curve-fitting method, and the length is obtained using Green’s theorem. Case studies on R134a, R600a, R12, R410A and R407C show that the deviation between the predicted results of the proposed method and those of the existing distributed parameter model is less than 2% while the computation speed of the proposed method is 1000 times faster. The proposed method can meet the requirements for refrigeration system simulation.

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Pages: 38-43

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