Importance

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Abstract

To provide a refrigerating unit using ammonia as a refrigerant, which uses a lubricant that is excellent in the compatibility with an ammonia refrigerant as well as in the lubricity and the stability. An ammonia refrigerating unit formed by a refrigerating cycle including a refrigeration compressor, a condenser, an expansion valve and an evaporator, wherein a working is circulated in said refrigerating cycle, the working fluid including ammonia and a lubricant that contains a polyether compound represented by one of the following formula (1) or (2): X{--O--(AO).sub.n --H}.sub.p (1) X{--O--(AO.sup.1).sub.a --(AO.sup.2).sub.b --H}.sub.p (2) [wherein X represents a residue resulting from removing a hydroxyl group from a monool or a polyol; (AO).sub.n represents an AO chain constituted by copolymerization of EO and C3 or more AO; (AO.sup.1).sub.a represents an AO chain constituted by copolymerization of EO and PO and/or BO; AO.sup.2 represents C3 or more AO; and in the formula (1), the number of the secondary hydroxyl groups from among hydroxyl groups at the structural terminal is 50% or more of the total number of the hydroxyl groups].

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First Claim