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A heating/air-conditioning installation for a motor vehicle has a thermal loop which includes a refrigerating compressor, a gas cooler, a pressure-reducing valve, an evaporator, and a heating element. The gas cooler and the heating element are grouped together into a single exchanger including a ma

A heating/air-conditioning installation for a motor vehicle has a thermal loop which includes a refrigerating compressor, a gas cooler, a pressure-reducing valve, an evaporator, and a heating element. The gas cooler and the heating element are grouped together into a single exchanger including a main module forming a main fluid-carrying heat exchanger.

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What is claimed is: 1. A heating/air-conditioning installation for a motor vehicle, the installation comprising a thermal loop which includes a refrigerating compressor, a condenser, a pressure-reducing valve, an evaporator and a heating element; the condenser and the heating element are interconne

What is claimed is: 1. A heating/air-conditioning installation for a motor vehicle, the installation comprising a thermal loop which includes a refrigerating compressor, a condenser, a pressure-reducing valve, an evaporator and a heating element; the condenser and the heating element are interconnected together into a main fluid-carrying heat exchanger provided to simultaneously carry both a heat-carrying fluid and a refrigerant fluid; the main fluid-carrying heat exchanger includes at least one first circulation element carrying the heat-carrying fluid and at least one second circulation element carrying the refrigerant fluid; the at least one first circulation element has a first longitudinal axis; and the at least one second circulation element has a second longitudinal axis; wherein the first longitudinal axis is substantially parallel to the second longitudinal axis and wherein the at least one first circulation element at least partially circumscribes the at least one second circulation element so that the at least one first circulation element is in contact with the at least one second circulation element. 2. The installation of claim 1, the main fluid-carrying heat exchanger further comprises: at least one surface for exchanging heat between air and the heat-carrying fluid flowing through the main fluid-carrying heat exchanger, and at least one surface for exchanging heat between the heat-carrying fluid and the refrigerant fluid flowing through the main heat-carrying fluid exchanger. 3. The installation of claim 1, the main fluid-carrying heat exchanger further comprises: at least one surface for exchanging heat between air and the refrigerant fluid, and at least one surface for exchanging heat between the heat-carrying fluid and the refrigerant fluid. 4. The installation of claim 1, wherein the main fluid-carrying heat exchanger includes a single first collector of the heat-carrying fluid and a single second collector of the refrigerant fluid, the first and second single collectors being arranged at opposite ends of the main fluid-carrying heat exchanger. 5. The installation of claim 4, wherein the main fluid-carrying heat exchanger within the thermal loop exchanges heat between the heat-carrying fluid and the refrigerant fluid, wherein the at least one first circulation element of the main fluid-carrying heat exchanger is provided for circulating the heat-carrying fluid along an outwards and return path from and to the first collector and the at least one second circulation element is provided for circulating the refrigerant fluid along an outwards and return path from and to the second collector. 6. The installation of claim 5, wherein circulation of the refrigerant fluid and circulation of the heat-carrying fluid currents take place along U-shaped paths inside the main fluid-carrying heat exchanger and arranged so that the refrigerant fluid and the heat-carrying fluid circulate counter to each other. 7. The installation of claim 1, wherein the thermal loop further comprises an additional evaporator for operation in a heating mode and a routing circuit defining a heat pump in the heating mode, the heat pump utilizing the condenser of the main fluid-carrying heat exchanger and the additional evaporator as an apparatus for converting the refrigerant fluid into vapor. 8. The installation of claim 1, wherein the thermal loop further comprises a second routing circuit forming a heating loop in a thermal heating mode, the heating loop including the compressor and the main fluid-carrying heat exchanger, a refrigerant-fluid outlet of the main fluid-carrying heat exchanger being coupled to an inlet of the compressor. 9. The installation of claim 8, further comprising a second pressure-reducing valve arranged downstream of the main fluid-carrying heat exchanger. 10. The installation of claim 1, wherein the heat-carrying fluid is in the form of one of cooling water and overcooled water and wherein the thermal loop includes a supply device for supplying the main fluid-carrying heat exchanger with one of the cooling water and the overcooled water as the heat-carrying fluid. 11. The installation of claim 10, further comprising: an air-conditioning mode in which the main fluid-carrying heat exchanger is traversed by the refrigerant fluid and by the heat-carrying fluid, and a heating mode in which the main fluid-carrying heat exchanger is traversed by the heat-carrying fluid. 12. The installation of claim 11, further comprising a mixing flap that controls flow of air passing through the main fluid-carrying heat exchanger, in the air-conditioning mode the mixing flap is in a closed position in which airflow through the main fluid-carrying heat exchanger is restricted. 13. The installation of claim 12, further comprising a de-misting mode in which the air-conditioning mode is activated, and in which the mixing flap is in an at least partially open position, so that the main exchanger is traversed by at least a part of the airflow. 14. The installation of claim 1, wherein the second circulation element is disposed adjacent to and abutting the first circulation element. 15. The installation of claim 14, further comprising a heat dissipating fin adjacent the first circulation element. 16. A heating/air-conditioning installation for a motor vehicle, the installation comprising a thermal loop which includes a refrigerating compressor, a condenser, a pressure-reducing valve, an evaporator and a heating element; the condenser and the heating element are interconnected together into a main fluid-carrying heat exchanger provided to simultaneously carry both a heat-carrying fluid and a refrigerant fluid; the main fluid-carrying heat exchanger includes at least one first circulation element carrying the heat-carrying fluid and at least one second circulation element carrying the refrigerant fluid; wherein the at least one first circulation element at least partially circumscribes the at least one second circulation element so that the at least one first circulation element is in contact with the at least one second circulation element, and wherein the main fluid-carrying heat exchanger includes a single first collector of the heat-carrying fluid and a single second collector of the refrigerant fluid, the first and second single collectors being arranged at opposite ends of the main fluid-carrying heat exchanger. 17. The installation of claim 16, wherein the main fluid-carrying heat exchanger within the thermal loop exchanges heat between the heat-carrying fluid and the refrigerant fluid, wherein the at least one first circulation element of the main fluid-carrying heat exchanger is provided for circulating the heat-carrying fluid along an outwards and return path from and to the first collector and the at least one second circulation element is provided for circulating the refrigerant fluid along an outwards and return path from and to the second collector. 18. The installation of claim 17, wherein circulation of the refrigerant fluid and circulation of the heat-carrying fluid currents take place along U-shaped paths inside the main fluid-carrying heat exchanger and arranged so that the refrigerant fluid and the heat-carrying fluid circulate counter to each other. 19. A heating/air-conditioning installation for a motor vehicle, the installation comprising a thermal loop which includes a refrigerating compressor, a condenser, a pressure-reducing valve, an evaporator and a heating element; the condenser and the heating element are interconnected together into a main fluid-carrying heat exchanger provided to simultaneously carry both a heat-carrying fluid and a refrigerant fluid; the thermal loop further comprises an additional evaporator for operation in a heating mode and a routing circuit defining a heat pump in the heating mode, the heat pump utilizing the condenser of the main fluid-carrying heat exchanger and the additional evaporator as an apparatus for converting the refrigerant fluid into vapor; the main fluid-carrying heat exchanger includes at least one first circulation element carrying the heat-carrying fluid and at least one second circulation element carrying the refrigerant fluid; wherein the at least one first circulation element at least partially circumscribes the at least one second circulation element so that the at least one first circulation element is in contact with the at least one second circulation element.