Abstract
This paper indicates a comparative study of a straight capillary tube, by considering an adiabatic, homogenous, and unchoked flow model. The model is developed for a CO2 and R22 refrigerants by employing the basic principles of fluid and thermodynamics. Thermodynamic properties of R22 and CO2 are obtained from property code REFPROP and CO2PROP, respectively. The result of the model is validated with earlier published results. The variation in mass flow rate at different geometric factors of the tube has been evaluated. The change in tube length is calculated at the given mass flow rate, tube diameter, and surface roughness. The major change in the performance of the capillary tube is observed for the tube diameter, while less variation is observed with surface roughness. The mass flow rate of CO2 is nearly 8–9 times of R22 refrigerant at different geometric configurations. The capillary tube length of CO2 is about 1.4 times of R22 refrigerant. This study is useful to the design of the straight capillary tube with CO2 and R22 refrigerants.
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