Use of semi-aromatic copolyamide for transporting refrigerant fluid

Abstract

Provided is a method for heating or cooling a liquid or a body by means of a vapor compression circuit containing a heat transfer fluid. The vapor compression circuit element includes at least one layer that includes copolyamide of formula X/10.T/Y, where the structural variables are described herein.

1 .- 28 . (canceled) 
     
     
         29 . A heat transfer device comprising a vapor compression circuit which comprises at least one vapor compression circuit element comprising at least one layer consisting of (1) 30% to 99% by mass of at least one copolyamide comprising units of the formula X, 10.T and Y and (2) at least one member selected from the group consisting of functionalized polyolefins, plasticizers, conversion aids, fillers, heat stabilizers, UV stabilizers, nucleating agents, dyes, pigments, mold release agents, flame retardants, surfactants, fluorescent whiteners, additional polymers, and antioxidants, 
       wherein:
 X represents alternatively the residues of an aliphatic amino acid comprising from 8 to 18 carbon atoms, or a lactam, or the unit X 1 .X 2  which represents the residues resulting from the condensation of an aliphatic diamine comprising from 6 to 18 carbon atoms and a (cyclo)aliphatic dicarboxylic acid comprising from 6 to 18 carbon atoms; 
 10.T represents the residues from the condensation of a decane diamine and terephthalic acid; 
 Y represents the residues from the condensation of an aliphatic diamine comprising from 9 to 14 carbon atoms and an aromatic dicarboxylic acid, Y being different from the unit 10.T; 
 the molar proportion of units 10.T in the copolyamide is greater than 0%; 
 the molar proportion of the units Y relative to the total of units 10.T and Y is from 0% to 30%; 
 the proportion of units X is from 0.4 to 0.8 mol per mole of semi-aromatic units 10.T and Y; 
 the vapor compression circuit element is suitable for transporting a heat transfer fluid selected from the group consisting of hydrocarbon, hydrofluorocarbon, ether, hydrofluoroether, and fluoroolefin compounds; and 
 the heat transfer device is selected from the group consisting of mobile and stationary air conditioning devices, refrigeration devices, freezing devices, Rankine-cycle and heat-pump heating devices. 
 
     
     
         30 . The heat transfer device as claimed in  claim 29 , wherein the vapor compression circuit contains a heat transfer fluid selected from the group consisting of hydrocarbon, hydrofluorocarbon, ether, hydrofluoroether, and fluoroolefin compounds. 
     
     
         31 . The heat transfer device as claimed in  claim 30 , wherein the heat transfer fluid is admixed with a lubricant. 
     
     
         32 . The heat transfer device as claimed in  claim 29 , wherein the vapor compression circuit element is in contact with the heat transfer fluid and wherein the heat transfer fluid is a admixed with a lubricant. 
     
     
         33 . The heat transfer device as claimed in  claim 29 , wherein the vapor compression circuit element belongs to a vapor compression circuit integrated in a device selected from the group consisting of mobile and stationary air conditioning devices, refrigeration devices, freezing devices, Rankine-cycle and heat-pump heating devices. 
     
     
         34 . The heat transfer device as claimed in  claim 29 , wherein the vapor compression circuit element is a connection element or a pipe. 
     
     
         35 . The heat transfer device as claimed in  claim 29 , wherein said layer is disposed on an inner surface of the element. 
     
     
         36 . A heat transfer device as claimed in  claim 29 , wherein the vapor compression circuit element is a multilayer tube comprising in succession:
 an inner layer consisting of the at least one copolyamide;   optionally, a first intermediate layer, composed of a first composition comprising an elastomeric material;   optionally, a second intermediate layer, composed of a reinforcing textile; and   an outer layer, composed of a second composition comprising an elastomeric material.