A theoretical model for predicting adiabatic capillary tube performance with alternative refrigerants.

Summary

A theoretical model for predicting adiabatic capillary tube performance is presented. Model predictions of flow rate were compared to measured data with R134a, R22, R152a, and R410A. The comparison of the model predictions to the breadth of experimental data provided a comprehensive assessment of the model's accuracy. Several key modeling issues are addressed: a single-phase friction factor equation was developed for capillary tube based on measured data from two independent sources, three two-phase viscosity models were evaluated and a recommendation of the best model was made, and a metastable flow correlation previously reported in the literature was evaluated and the limitations determined.

Details

Original title: A theoretical model for predicting adiabatic capillary tube performance with alternative refrigerants.
Record ID : 1997-2100
Languages: English
Source: ASHRAE Transactions.
Publication date: 1996/06/23
Document available for consultation in the library of the IIR headquarters only.

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Indexing

Themes: Refrigerants, secondary refrigerants: general information;
Expansion systems;
Refrigerant circulation: piping, control, automation, safety
Keywords: Refrigerating circuit; Capillary; Calculation; Substitute; Simulation; Performance; Expansion; Refrigerant