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AssigneeHitachi, Ltd.
InventorsMasahiko Itoh, Heihatiro Midorikawa, Kazutoshi Itoh, Yasumasa Furutani, Michihiko Aizawa
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A hermetically closed circulation type, vapor absorption refrigerator which comprises a high temperature regenerator, a low temperature regenerator a condenser, an evaporator, an absorber and heat exchangers in a hermetically closed circulation system as essential constituent members composed of iron-based materials, where refrigeration is produced by repetitions of concentration of an absorbing solution sealed into the circulation system, dilution with a cooling medium and heat exchange, the inside wall of the high temperature regenerator being provided with a composite film of molybdenum oxides and iron oxide can be operated stably with a high reliability or corrosion resistance.
A process for forming an anti-corrosive film on the inside wall of a high temperature regenerator of a hermetically closed circulation type, vapor absorption refrigerator comprising a high temperature regenerator, a low temperature regenerator, a condenser, an evaporator, an absorber and heat exchangers in a hermetically closed circulation system as essential constituent members composed of iron-based materials, which comprises providing a solution recycle line and a cooling medium supply line to the high temperature regenerator, sealing an aqueous solution containing molybdate ions and having a pH of 7.5 to 11 as a film-forming solution into the high temperature regenerator in advance to a refrigerating operation, recycling the film-forming solution in the high temperature regenerator through the solution recycle line while heating the high temperature refrigerator and supplying a cooling medium to the high temperature regenerator in an amount to balance the amount of water vapor evaporated from the film-making solution through the cooling medium supply line, thereby subjecting the high temperature regenerator to a film-forming operation and forming an anti-corrosive film on the inside wall of the high temperature regenerator, then closing the solution recycle line and the cooling medium supply line and withdrawing the film-forming solution from the high temperature regenerator.
A process for forming an anti-corrosive film on the inside wall of a high temperature regenerator of a hermetically closed circulation type, vapor absorption refrigerator comprising a high temperature regenerator, a low temperature regenerator, a condenser, an evaporator, an absorber and heat exchangers in a hermetically closed circulation system as essential constituent members composed of iron-based materials, which comprises introducing a film-making solution into the high temperature regenerator and heating the high temperature regenerator in the presence of the film-making solution, thereby forming an anti-corrosive film on the inside wall of the high temperature regenerator.
A hermetically closed circulation type, vapor absorption refrigerator which comprises a high temperature regenerator, a low temperature regenerator, a condenser, an evaporator, an absorber and heat exchangers in a hermetically closed circulation system as essential constituent members composed of iron-based materials, where refrigeration is produced by repetitions of concentration of an absorbing solution sealed into the circulation system, dilution with a cooling medium and heat exchange, and recycle piping being provided at the high temperature regenerator, thereby passing a film-making solution in a liquid state through the high temperature regenerator and forming an anti-corrosive film on an inside wall of the high temperature regenerator.
Dependencies are inferred from the claim text.