Abstract: The invention concerns a chamber (1) divided into two zones (11, 12) for preservation at different temperature, separated by a vertical mobile thermal barrier (10), capable of sliding horizontally and enabling said zones (11, 12) to exhibit modifiable dimensions as required. The meal trays (4) comprise, on opposite edges, notches (7) adapted to receive a removable insulating partition (8, 9) separating the meals (13) to be served hot from those to be served cold and whereof the position can be modified to correspond with that of the thermal barrier (10). Vertical sheaths (21) enable, by means of turbines, to circulate warm or cool air, through orifices (22). A valve (23) prevents the air in sheaths (21) from passing through the evaporator (18). Electric resistors (16) with fins are arranged opposite or beneath the meal trays (4). A refrigerating compressor (20, 20′), provided in a lower casing (2) or an upper casing (3), for cool air diffusion and circulation, feed the evaporator (18).

Abstract: An installation comprising a cupboard with a top section providing an assembly of cold units, and a preserving section provided with insulating shelves and trays with through slots for placing containers thereon. Each insulating shelf comprises, in each zone supporting the container base of the meal service trays, a tubular pipe exchanger connected to a cooling pipe circuit, while at least one heat exchanger on each shelf is associated with an electric heating unit, and the cold units assembly is a sealed chamber formed by and/or containing tubular heat exchanging pipes whereof the tubular networks are interconnected to each other and connected to a cooling pipe circuit.