Refrigerant and heat transfer fluid additive
OwnerPatrick Bonsignore, Michael H. Gurininventors
Life of this patent
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Abstract
An additive suited to use in combination with heat transfer media comprises a chemically stabilized nano-particle size powder. Suitable powders include those of copper, beryllium, titanium, nickel, iron, alloys or blends thereof, and carbon. The surface of the powder is modified by surface complexation or physical adsorption with a chemical agent. The additive, when mixed with a heat transfer medium, forms a colloidal dispersion which exhibits enhanced heat transfer capacity and thermal conductivity, stable chemical composition, faster heat transfer rates, dispersion maintenance which are beneficial to most heat transfer systems.
Claims27
A heat transfer composition comprising:
- a heat transfer medium;
- and
- an additive comprising:
- a powder selected from the group consisting of metals, metal oxides, alloys, and combinations thereof, the powder having an average particle size of from about 1 nanometer to about 100 microns, and
- a coating on the powder, the coating including at least one chemical agent selected from the group consisting of organic corrosion inhibitors, inorganic corrosion inhibitors, ethylene oxide/polypropylene oxide block copolymers, and combinations thereof.
A heat transfer composition for transferring heat between a heat source and a heat sink, the composition comprising:
- a heat transfer medium;
- and
- an additive comprising:
- a powder which includes carbon, the powder having an average particle size of from about 1 nanometer to about 100 microns, and
- a coating on the powder, the coating including at least one chemical agent selected from the group consisting of ethylene oxide/polypropylene oxide block copolymers, surfactants, lignin, lignin derivatives, alkali metal salts, alkali earth metal salts, ammonium salts, alkyl ether phosphates, and combinations thereof.
An additive for a heat transfer medium comprising:
- a nano-particle size powder having an average particle size of from about 1 nanometer to about 2000 nanometers and being formed from a material selected from the group consisting of metals, alloys, metal compounds, carbon, and combinations thereof, the powder being chemically stabilized with an azole.
A process for transferring heat between a heat source and a heat sink, the method comprising:
- transferring heat between the heat source and the heat sink with a heat transfer composition which includes a powder having a particle size of, the powder being selected from the group consisting of metals, metal alloys, metal blends, metal compounds, carbon, and combinations thereof, the powder having an average particle size of from about 1 nanometer to about 2000 nanometers and having a surface thereof coated with a chemical agent which provides the powder with improved corrosion resistance or dispersion characteristics as compared with an uncoated powder, the chemical agent being selected from the group consisting of organic corrosion inhibitors, inorganic corrosion inhibitors, ethylene oxide/polypropylene oxide block copolymers, surfactants, lignin, lignin derivatives, and combinations thereof.
Dependencies are inferred from the claim text.