System for the heating, ventilation, and/or air conditioning of a vehicle, comprising at least one heat exchanger through which a heat-transfer fluid flows

1. A system ( 1 ) for the heating, ventilation, and/or air conditioning of a motor vehicle passenger compartment, said system ( 1 ) comprising:

at least one heat exchanger ( 6 , 7 ) through which there flows a heat-transfer fluid (FC), wherein a first of said at least one heat exchanger ( 6 , 7 ) is a radiator ( 7 ) and a second of said at least one heat exchanger ( 6 , 7 ) is a gas cooler ( 6 ) participating in an air-conditioning loop ( 8 ) around which a refrigerant (FR) flows;

at least one means for pumping the heat-transfer fluid (FC) at a flow rate of between 40 liters per hour (l/h) and 200 l/h, in such a way that a temperature difference of the heat-transfer fluid (FC) between an outlet ( 9 , 10 ) and an inlet ( 11 , 12 ) of the heat exchanger ( 6 , 7 ) is greater than 45° C., whereby a coefficient of performance between 3 and 4 is maintained in said air-conditioning loop ( 8 ); and

a conveying circuit ( 4 ) that includes a branch ( 4 ) on which said gas cooler ( 6 ) is installed, said branch ( 4 ′) includes:

a first channel ( 24 ) extending directly between a three-way valve ( 27 ) and a first junction point (P 1 ) located on said conveying circuit ( 4 ) upstream of the radiator ( 7 ) in the direction of flow of the heat-transfer fluid (FC) within said conveying circuit ( 4 ),

a second channel ( 25 ) extending directly between said three-way valve ( 27 ) and a second junction point (P 2 ) located on said conveying circuit ( 4 ) downstream of the radiator ( 7 ) in the direction of flow of the heat-transfer fluid (FC) within said conveying circuit ( 4 ), and

a third channel ( 26 ) extending between said three-way valve ( 27 ) and a third junction point (P 3 ) located on said conveying circuit ( 4 ) downstream of the radiator ( 7 ) in the direction of flow of the heat-transfer fluid (FC) within said conveying circuit ( 4 );

wherein said means for pumping comprises: said three-way valve ( 27 ): a first valve ( 28 ) arranged on said conveying circuit ( 4 ) downstream of the third junction point (P 3 ) in the direction of flow of the heat-transfer fluid (FC) within said conveying circuit ( 4 ); and a second valve ( 29 ) arranged on said third channel ( 26 ) upstream of the third point (P 3 ) in the direction of flow of the heat-transfer fluid (FC) within said conveying circuit ( 4 ).

2. A system ( 1 ) according to claim 1 , wherein said means for pumping is a constituent of a conveying circuit ( 4 ) for the heat-transfer fluid (FC).

3. A system ( 1 ) according to claim 2 , wherein said means for pumping further comprises a pump ( 23 ) with a variable and controlled flow rate participating in said conveying circuit ( 4 ).

4. A system ( 1 ) according to claim 2 , wherein said means for pumping further comprises a plurality of flow paths ( 21 ) for the heat-transfer fluid (FC) which are formed within said at least one heat exchanger ( 6 , 7 ).

5. A system ( 1 ) according to claim 2 , wherein said conveying circuit ( 4 ) comprises an engine or motor ( 5 ) of the vehicle.

6. A system ( 1 ) according to claim 1 , wherein said gas cooler ( 6 ) is a constituent of the conveying circuit ( 4 ).

7. A system ( 1 ) according to claim 1 , wherein said gas cooler ( 6 ) is arranged on said third channel ( 26 ).

8. A system ( 1 ) according to claim 1 , wherein the heat-transfer fluid (FC) is a mixture of water and glycol.

9. A system ( 1 ) according to claim 1 , wherein the refrigerant (FR) is a supercritical fluid.

10. A system ( 1 ) according to claim 1 , wherein said gas cooler ( 6 ) comprises a flow circuit ( 22 ) for the refrigerant (FR) that is counter-current to the flow paths ( 21 ) of the heat-transfer fluid (FC).

11. A system ( 1 ) according to claim 10 , wherein said flow circuit ( 22 ) of the refrigerant (FR) is single-passage vis-a-vis the flow paths ( 21 ) of the heat-transfer fluid (FC).