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In this paper, the diameter of the pipe necessary for the lubrication oil to be entrained in the sucking and discharge line of the refrigerating systems using various alternative refrigerants calculated, its change range in accordance with temperature has been studied. The values of the minimum velocity of the refrigerant (Vr,min) and the minimum refrigeration load (qr,min) necessary for the oil in the pipes in the suction and discharge lines to be entrained in accordance with the estimated pipe diameters determined at the first stage of this study have been calculated, and the diameters of the pipes to be used in the light of these values have been calculated. In a refrigeration system in which refrigerating load is 1 kw for copper pipes of K and L type, eco-friendly, alternative R134A, R410A and R423A refrigerants in place of refrigerants detrimental to ozone layer and leading to global warming have been used. [ABSTRACT FROM AUTHOR]

The aim of this study is the calculation of the pipe diameter required to transfer the oil in the vertical parts of the cooling systems, at the desired cooling load and at the velocity of the minimum cooling liquid. For this purpose, the velocity of the minimum cooling liquid for the driftage of the oil in the pipes in the suction line (Vs,min) and the minimum cooling load (qs,min) have been studied. After the theoretical analysis as to the matter, in a system the cooling load of which 1 kW, for the copper pipes whose types are K and L, in place of the cooling liquids harming the ozon layer and leading to global warming, the environment-friendly, natural and alternative liquids R134A, R410A, R423A and R744 have been used. According to the results, as the pipe diameters increase, the velocity of minimum cooling liquid for the driftage of the oil increases. In addition to that, the load of the minimum cooling liquid increases, both the pipe diameters and the heat of the evaporator being increased. Cooling liquids being considered, the change of the velocities as R744