Introduction
Suction line accumulator is placed between evaporator and compressor. It prevents compressor from sucking liquid so that only vapor refrigerant gets through to the compressor. Special designs such as U-tube and tube-in-tube are used for maximum refrigerant flow and minimum oil trap. These designs allow refrigerant vapor to be sucked from the top, while oil and liquid refrigerant trapped in suction line accumulator are sucked from the hole on the outlet tube and return to the compressor together with refrigerant vapor. In applications with very low evaporation temperature suction line accumulator with built in heat-exchanger is used in order to facilitate evaporation of liquid refrigerant or to reduce oil viscosity and provide fluent refrigerant flow.