The invention provides a reversible heat exchanger (20) for transferring heat between a refrigerant and another fluid, the heat exchanger (20) comprising at least one exchange line (22, 24) in which a refrigerant is intended to flow between an inlet and an outlet of the heat exchanger, the exchange pipe (22, 24) defining a first and a second refrigerant transport circuits inside the pipe. exchange between the inlet and the outlet of the heat exchanger, the first transport circuit being different from the second transport circuit, the heat exchanger (20) being configured to allow the circulation of the refrigerant according to: - a first direction of circulation (25) inside the first transport circuit from the entrance to the exit of the interchange, and - a second direction of circulation (27) inside the second transport circuit from the exit of the exchanger to the entrance of the exchanger. Figure for the abstract: Fig. 2
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