Hermetically circulating, absorption type refrigerator

A hermetically circulating, absorption type refrigerator based on a closed circulation system of constituent members comprised of a successive communication of a regenerator, a condenser, an evaporator, an absorber and a heat exchanger, parts or the whole of said constituent members in contact with an absorbing solution being comprised of steel and a copper material selected from copper and copper alloy, and refrigeration being produced by repetitions of concentration, refrigerant dilution, and heat exchange of an aqueous concentrated lithium bromide solution sealed in the circulation system, characterized in that said absorbing solution contains the following compounds (a) and (b) for function as a corrosion inhibitor:

• (a) a nitrate of an alkali metal, and
• (b) a triazole compound selected from benzotriazole and tolyltriazole
• in an amount of 0.01 to 0.05% by weight of the nitrate and 0.005 to 0.1% by weight of the triazole compound.