Analytical Investigations of Capillary Tubes with Mixture Refrigerants Used In Refrigerators

Sree Ramachandra murthy.K, T. Dharmaraju


Capillary tubes are used as expansion device in low capacity refrigeration machines like domestic refrigerators and window type air conditioners. The advantages of the capillary tube over other development gadgets are basic, cheap and cause blower to begin at low torque as the weight over the slender cylinder adjust during the off-cycle. The flow attributes of refrigerants through narrow cylinders have been considered broadly in recent decades, by both theory and experiment it is observed that , a large portion of these examinations for the most part centered around straight capillary tube.


The R174A refrigerant and azeotropic mixture of R30 & R160 is made with R160 concentrations of 0%, 20%, 40%, 60%, 80% and 100% in R30 and it is used in a Refrigeration unit with different flow rates by fixing the other input parameters constant. In this thesis the analysis it is known that higher flow rates of the refrigerant mixture increase the heat transfer rates but in the expense of higher work consumption which will affect the coefficient of performance of the refrigerant unit which is not advisable to use since the work utilization of the good refrigeration unit should be lesser for unit of refrigeration.CFD analysis to determine the heat transfer coefficient, mass flow rate, heat transfer rate, pressure drop at different number coils (30 and 40 coils).


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