Conference Year



suction lines, oil retention, pressure drop


An experimental investigation of oil retention and pressure drop characteristics for R1234yf, R134a and R410A with POE 100 is presented, for horizontal and vertical suction lines of 10.2 mm internal diameter. Conditions of operation include a saturation temperature of 13 °C and a superheat of 15 °C, with the superficial vapor velocity and the Oil in Circulation Ratio (OCR) both varied in the range of 1-6 m/s and 1-5 % respectively. The effect of lubricant viscosity on oil retention and pressure drop is also presented by comparing results with those of POE 32, under the same conditions of operation.