IMPROVED AIR-CONDITIONING DEVICE, IN PARTICULAR FOR A RAILWAY VEHICLE COMPARTMENT

The air conditioning device (10) comprises: a first heat pump circuit (12), in which a refrigerant fluid circulates, the first circuit comprising a first heat exchanger (14) with outside air, a compressor (16) and an expansion device (20); a second circuit (22), in which a heat transfer fluid circulates, comprising a second heat exchanger (24) with air from the compartment (11); a common heat exchanger (28), through which the first circuit (12) and the second circuit (22) pass, capable of exchanging heat between the refrigerant fluid and the heat transfer fluid; and a thermal storage tank (30), connected to the first circuit (12) in parallel with the common heat exchanger (28), and connected to the second circuit (22) in parallel with the common heat exchanger (28).