A method of refrigerating a product by a refrigeration machine, including a source of supply of refrigerant fluid, a conduit to evacuate the refrigerant fluid, and a refrigeration chamber to receive the product to be refrigerated. The product is contained in a container disposed in the refrigeration chamber. The method involves an operation of refrigerating the refrigeration chamber by the refrigerant fluid and evacuating the refrigerant fluid by the conduit, wherein the container is in direct contact with the refrigerant fluid.
