An experimental investigation was conducted to observe the effect of sub-cooling degree on themass flow rate of R-134a through a diabatic laterally configured straight capillary tube. The variationof mass flow rate of refrigerant through the capillary with the sub-cooling degree is observed to beindependent of capillary tube geometry and the inlet pressure. When the diameter of the capillarytube decreased from 1.52 mm to 1.27 mm, the mass flow rate through the capillary tube alsodecreased by 16 percent. Also The mass flow rate of refrigerant was observed to increase by 12 to17 percentage in all the tested capillary tubes with an increase of sub-cooling from 6°C to 9°C.
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