Ketone-containing working fluid for refrigerating cycle equipment and refrigerating cycle equipment having the same

A working fluid for refrigerating cycle equipment of refrigerant compression-type containing the refrigerant and a refrigeration lubricant for a refrigerator, wherein said refrigerant comprises a hydrocarbon having 2 to 4 carbon atoms and no halogen atom and said refrigeration lubricant comprises, as a main component, a ketone compound of the formula (1):

• wherein R2, R3, R4 and R5 are independently a hydrogen atom, a linear or grafted alkyl, alkenyl or arylalkyl group having 1 to 25 carbon atoms, or phenyl group which may be substituted by a linear or grafted alkyl or alkenyl group having 1 to 15 carbon atoms, R1 and R6 are independently a linear or grafted alkyl, alkenyl or arylalkyl group having 1 to 25 carbon atoms, phenyl group which may be substituted by a linear or grafted alkyl or alkenyl group having 1 to 15 carbon atoms, an n-propyl 2 group, or a polyalkylene oxide residue, n is an integer of 1 to 19, m is an integer of 1 to 5, wherein when each of m and n is not less than 2, each of R2, R3, R4 and R5 may not show the same substituted group in each unit.