Heat and mass transfer additives for improved aqueous absorption fluids
AssigneeRocky Research
InventorsTravis Chandler, Uwe Rockenfeller
Life of this patent
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Abstract
The rate of water vapor sorption of an absorption cycle cooling and/or heating system using an aqueous alkali metal halide solution as the working fluid is increased by adding to the fluid an effective additive amount of at least 2 parts per million of an aliphatic, cycloaliphatic, or aromatic ketone or aldehyde capable of increasing the rate of water vapor absorption.
Claims32
A water vapor absorption cycle cooling and/or heating system comprising an absorber containing a working fluid comprising an aqueous solution of a metal salt comprising lithium bromide, lithium chloride, lithium iodide, or mixtures of two or more thereof, and an effective amount of between 2 and about 50,000 parts per million, by weight, of an aliphatic, cycloaliphatic or aromatic ketone or aldehyde additive having between 5 and 24 carbon atoms for increasing the rate of water vapor sorption of said working fluid, said aliphatic ketone being of the formula R1(C═O)R2 wherein R1 and R2 are the same or different alkyl and substituted alkyl groups of from 1 to 12 carbon atoms and wherein when R1 is a methyl group the carbon atom of the other alkyl group R2 attached to the carbonyl group is a primary or tertiary carbon atom, and wherein the amount of said metal salt present in said absorber is at least about 40%, by weight, of said working fluid.
A water vapor absorption cycle cooling and/or heating system comprising an absorber containing a working fluid comprising an aqueous solution of a metal salt selected from lithium bromide, lithium chloride, lithium iodide, or mixtures of two or more thereof, or a hydroxide selected from sodium hydroxide, potassium hydroxide or mixtures of said hydroxides, and an effective amount of between 2 and about 50,000 parts per million, by weight, of an aliphatic, cycloaliphatic or aromatic ketone having between 5 and 24 carbon atoms for increasing the rate of water vapor sorption of said working fluid, said aliphatic ketone being of the formula R1(C═O)R2 wherein R1 and R2 are the same or different alkyl and substituted alkyl groups of from 1 to 12 carbon atoms and wherein when R1 is a methyl group the carbon atom of the other alkyl group R2 attached to the carbonyl group is a primary or tertiary carbon atom, and wherein the amount of said lithium metal salts present in said absorber is at least about 40%, by weight, and the amount of said hydroxide present in said absorber is at least about 30%, by weight, of said working fluid.
Dependencies are inferred from the claim text.