Selection of spiral capillary tube for refrigeration appliances

Selection of spiral capillary tube for refrigeration appliances and the effect of changes in the parameters such as capillary tube dimensions i.e. capillary tube diameter, coil pitch, capillary tube length and inlet conditions of refrigerant to the capillary tube i.e. degree of subcooling, inlet pressure on the mass flow rate of the refrigerant, also investigation about the coiling effect of spiral capillary tube on mass flow rate of refrigerant for same cooling load is reviewed in this paper. The characteristics coiling parameter for a spiral capillary tube is the coil pitch; hence, the effect of the coil pitch on the mass flow rate of refrigerant for several spiral capillary tube test sections plays vital role in investigation of the performance. The review is focused on the influence of tube diameter, tube length, coil pitch, and inlet condition on mass flow rate of refrigerant through spiral capillary tube, and also on investigation about the Coefficient of Performance (COP) of the system due to coiling effect of capillary tube. The use of spiral capillary tube reduces the space for the refrigeration system which is the need for more compact refrigeration system in the current trend. As the spiral capillary tube can be efficient in refrigeration appliances, it can also be employed in the air conditioning appliances.