JOAP: HITACHI - Transport Applications - 2020

• High reliability • Low noise and low vibration • High performance (2) High-side pressure design • Improved volumetric efficiency thanks to direct suction • Less parts leading to superior reliability • Keeping oil in the compressor resulting in superior reliability After starting, pressure and temperature decreases and refrigerant bubbles come over from the oil. Low-side pressure design Oil pump is necessary Oil migration with gas Oil foaming Suction gas Crank case heater necessary 1. High pressure gas Low pressure gas Oil Discharge gas Suction gas 4. 3. High-pressure gas circulation → Oil separated from the high pressure gas → No oil to travel to the cycle → Resulting in Superior Reliability Direct Suction → Reduces superheat → Improving volumetric efficiency High-pressure gas circulation → High temperatures and high pressure inside the chamber → Oil itself heated in the circulation → No oil foaming occurred & No crank case heater needed → Resulting in Superior Reliability Automatic oil supply thanks to the pressure difference → Oil pump is not needed → Resulting in Superior Reliability 1. 2. 4. 06 Hitachi Scroll Compressor For Transport