Absorption refrigerator and production method thereof

An absorption refrigerator which uses water as a refrigerant and a halogen compound as an absorption solution, characterized in that an oxide film of blue, purple or gray is formed on a surface of at least one of a heat exchanger and a high temperature regenerator.

An absorption refrigerator which uses water as a refrigerant and a halogen compound as an absorption solution, characterized in that an oxide film having hydroxyl group is formed on a surface of at least one of a heat exchanger and a high temperature regenerator.

An absorption refrigerator comprising a high temperature regenerator for heating water solution including a halogen compound to generate steam, a condenser for condensing the steam, a low temperature regenerator for cooling the steam, an evaporator for evaporating the water from said condenser and producing cold water, an absorber for absorbing the water from said evaporator into a water solution including a high concentration halogen compound, and a heat exchanger for returning the refrigerant issued from said absorber to said high temperature regenerator and effecting heat exchange between the water from said low temperature regenerator and the refrigerant from said absorber, characterized in that an oxide film, having thickness of 0.02-5.0 .mu.m, any color of blue, purple, black and gray, or hydroxyl group is formed on a surface of at least one of said heat exchanger and said high temperature regenerator.

An absorption refrigerator which uses water as a refrigerant and a halogen compound as an absorption solution, characterized in that an oxide film having thickness of 0.02-5.0 .mu.m, any color of blue, purple, black and gray, or hydroxyl group is formed on a surface of at least one of a heat exchanger and a high temperature regenerator.

An absorption refrigerator which uses water as a refrigerant and a halogen compound as an absorption solution, characterized in that an oxide film formed on a surface, of an iron or iron-containing component constituting said absorption refrigerator, contacting with said absorption solution is thinner than an oxide film formed on a surface of an iron or iron-containing component constituting piping of a cooling water line having a cooling tower, a cold water line and a steam line.

An absorption refrigerator comprising a high temperature regenerator for heating a water solution having a halogen compound to generate steam, a condenser for condensing the steam, a low temperature regenerator for cooling the steam, an evaporator for evaporating the water from said condenser and producing cold water, an absorber for absorbing the water from said evaporator into a water solution including a high concentration halogen compound, and a heat exchanger for returning the refrigerant issued from said absorber to said high temperature regenerator and effecting heat exchange between the water from said low temperature regenerator and the refrigerant from said absorber, characterized in that an oxide film having thickness of 0.02-5.0 .mu.m, any color of blue, purple, black and gray, or hydroxyl group is formed on at least a portion, contacting with said water solution, steam or water and made of iron or iron-containing material, of each of said high temperature regenerator, condenser, low temperature regenerator, evaporator, absorber and heat exchanger.

A heat exchanger for an absorption refrigerator which uses water as a refrigerant and a halogen compound as an absorption solution, characterized in that an oxide film having thickness of 0.02-5.0 .mu.m, any color of blue, purple, black and gray, or hydroxyl group is formed on a surface of said heat exchanger.

A high temperature regenerator for an absorption refrigerator which uses water as refrigerant and halogen compound as an absorption solution, characterized in that an oxide film having thickness of 0.02-5.0 .mu.m, any color of blue, purple, black and gray, or hydroxyl group is formed on a surface of said high temperature regenerator.

A production method of an absorption refrigerator which uses water as a refrigerant and a halogen compound as an absorption solution, characterized by oxidizing a surface of at least one of a heat exchanger and a high temperature regenerator at a temperature of 200.degree.-800.degree. C., and adjusting a heating temperature and a heating retaining time so that a value of parameter(P), obtained according to P=T (5+log t) is 3.5-6.0.times.10.sup.3, wherein T represents heating temperature (.degree.K), and t heating retaining time (minute).

A production method of an absorption refrigerator which uses water as a refrigerant and a halogen compound as an absorption solution, characterized in that a surface of at least one of a heat exchanger and a high temperature refrigerator is heated, thereby to from an oxide film thereon, in an oxidizing atmosphere in which partial pressure of steam is 0.0001 or more and partial pressure of oxygen is 0.2 or more.

A production method of an absorption refrigerator comprising a high temperature regenerator for heating a water solution having a halogen compound to generate steam, a condenser for condensing the steam, a low temperature regenerator for cooling the steam, an evaporator for evaporating the water from said condenser and producing cold water, an absorber for absorbing the water from said evaporator into a water solution including a high concentration halogen compound, and a heat exchanger for returning the refrigerant issued from said absorber to said high temperature regenerator and effecting heat exchange between the water from said low temperature regenerator and the refrigerant from said absorber, characterized by oxidizing a surface of at least one of said heat exchanger and said high temperature regenerator at a temperature of 200.degree.-800.degree. C., and adjusting a heating temperature and a heating retaining time so that a value of parameter(P), obtained according to P=T (5+log t) is 3.5-6.0.times.10.sup.3, wherein T represents heating temperature (.degree.K), and t heating retaining time (minute), or by heating the surface of at least one of said heat exchanger and said high temperature refrigerator in an oxidizing atmosphere in which partial pressure of steam is 0.0001 or more and partial pressure of oxygen is 0.2 or more thereby to form an oxide film thereon.

A production method of a heat exchanger for an absorption refrigerator which uses water as a refrigerant and a halogen compound as an absorption solution, characterized by oxidizing a surface of said heat exchanger at a temperature of 200.degree.-800.degree. C., and adjusting a heating temperature and a heating retaining time so that a value of parameter(P), obtained according to P=T (5+log t) is 3.5-6.0.times.10.sup.3, wherein T represents heating temperature (.degree.K), and t heating retaining time (minute), or heating the surface of said heat exchanger in an oxidizing atmosphere in which partial pressure of steam is 0.0001 or more and partial pressure of oxygen is 0.2 or more, thereby to form an oxide film thereon.

A production method of a high temperature regenerator for an absorption refrigerator which uses water as a refrigerant and a halogen compound as an absorption solution, characterized by oxidizing a surface of said high temperature regenerator at a temperature of 200.degree.-800.degree. C., and adjusting a heating temperature and a heating retaining time so that a value of parameter(P), obtained according to P=T (5+log t) is 3.5-6.0.times.10.sup.3, wherein T represents heating temperature (.degree.K), and t heating retaining time (minute), or heating the surface of said high temperature regenerator in an oxidizing atmosphere in which partial pressure of steam is 0.0001 or more and partial pressure of oxygen is 0.2 or more, thereby to form an oxide film thereon.