Vehicle for transporting heat-sensitive products in a refrigerated lorry, of the so-called indirect injection type, this lorry being provided with: - at least one chamber for storing the products; - a store of a cryogenic fluid such as liquid nitrogen; - a heat exchanger system that is inside said at least one chamber, in which the cryogenic fluid circulates, comprising a duct in which a cryogenic fluid can circulate, between an inlet for the fluid into the exchanger and an outlet for the fluid from the exchanger; and - an air circulation system, for example of the fan type, which is able to bring the air inside the chamber into contact with the cold walls of the heat exchanger system; characterized in that the heat exchanger system inside at least one of said chambers is of the tubes-and-fins battery type, and comprises: - a system of planar fins that are continuous and parallel and are passed through by said duct in its circuit inside the exchanger, the air being able to circulate within the exchanger, passing through channels delimited by the space between said duct and the parallel fins, the exchanger comprising at least two independent ducts (10a, 10b) for circulating cryogenic fluid inside the exchanger, and where, the exchanger in the space being considered as a box with an upper portion and a lower portion and sides, the inlet and outlet for the cryogen into and from the exchanger are configured to be able to implement the fact that the cryogen enters the upper portion of the exchanger and passes along a certain number of duct lengths in the upper portion of the exchanger before descending towards the bottom of the exchanger. - at least one chamber for storing the products; - a store of a cryogenic fluid such as liquid nitrogen; - a heat exchanger system that is inside said at least one chamber, in which the cryogenic fluid circulates, comprising a duct in which a cryogenic fluid can circulate, between an inlet for the fluid into the exchanger and an outlet for the fluid from the exchanger; and - an air circulation system, for example of the fan type, which is able to bring the air inside the chamber into contact with the cold walls of the heat exchanger system; - a system of planar fins that are continuous and parallel and are passed through by said duct in its circuit inside the exchanger, the air being able to circulate within the exchanger, passing through channels delimited by the space between said duct and the parallel fins, the exchanger comprising at least two independent ducts (10a, 10b) for circulating cryogenic fluid inside the exchanger, and where, the exchanger in the space being considered as a box with an upper portion and a lower portion and sides, the inlet and outlet for the cryogen into and from the exchanger are configured to be able to implement the fact that the cryogen enters the upper portion of the exchanger and passes along a certain number of duct lengths in the upper portion of the exchanger before descending towards the bottom of the exchanger. the exchanger comprising at least two independent ducts (10a, 10b) for circulating cryogenic fluid inside the exchanger, and where, the exchanger in the space being considered as a box with an upper portion and a lower portion and sides, the inlet and outlet for the cryogen into and from the exchanger are configured to be able to implement the fact that the cryogen enters the upper portion of the exchanger and passes along a certain number of duct lengths in the upper portion of the exchanger before descending towards the bottom of the exchanger.