Patent ID: 6349558
Filing Date: 2002-02-26
Classification: F25B,F25D

Abstract:
An ammonia refrigerator using ammonia as refrigerant and having a compressor, a condenser, an expansion valve, and an evaporator connected to each other through piping and a brine cooled by the refrigerant which is compressed in the compressor and then evaporated in the evaporator, comprising:said compressor having an electric motor for driving the compressor and a full-closed type or a half-closed type casing for accommodating said electric motor, said electric motor including a stator winding made of an aluminum wire and adapted to let the refrigerant flow through, said electric motor having a capacity and a starting current which are larger by 1.2 to 1.4 times as compared with a conventional electric motor having a stator wiring of copper; said evaporator being a plate type heat exchanger having a plurality of plates piled and adapted to let said brine flow through, said brine entering an upper portion of said heat exchanger and flowing downward and out from a lower portion thereof; and an inverter drive unit for controlling a capacity of said compressor, the capacity of said compressor being controlled in accordance with a flow rate of said brine.