PURPOSE: To increase the efficiency of a screw-type gas compressor by a method wherein non-azeotropic refrigerant (ammonia gas and water for example) is circulated by employing a gas compression type refrigerating device and a gas absorbing type refrigerating device in parallel while a liquid circulating pump, sending high-boiling point refrigerant solution into an aggregator (absorber), is miniaturized.
CONSTITUTION: Low concentration ammonia water is injected from an evaporator (reproducer) 15 into the halfway of a screw type gas compressor 6 compressing ammonia gas from the evaporator (reproducer) 15 to seal and cool the gas. On the other hand, the ammonia water absorbs one part of the gas. A liquid circulating pump 16, sending low-concentration ammonia water from the evaporator (reproducer) 15 into a high-pressure condenser (absorber) 10, sends one part or all of the liquid to the low-pressure side of the compressor 6. According to this method, the load of the pump 16 is reduced.
KAWAMURA KUNIAKI
NAMIKI HIROSHI
