A refrigerated container incorporating welded corrugated steel external walls having insulation disposed within the interior to form an insulated structure. A refrigeration compressor power by an electric motor together with a diesel engine operatively connected to an electrical generator for supplying power to the electric motor is secured integral with the container externally of the insulated interior but positioned at one end and protected by the extended sides, top and bottom of the container walls. Fuel storage is also provided at one end of the container. Refrigeration evaporators extend longitudinally at the juncture of the sidewalls and the internal ceiling of the container with evaporator coils distributed along both sides of the container; air is forced over the evaporator coils by strategically placed tandem centrifugal blowers directing air outwardly generally parallel to the ceiling and transverse to the length of the container. Air return is provided by extruded T-shaped floor rails spaced apart to provide a passageway for air penetration into the floor and which are provided with transverse holes to permit the transverse flow of return air through the floor to a sidewall. Return air is routed from the floor through ducts formed by false walls on either side of the container extending upwardly from the floor and terminating at an intake area to the evaporator coils. Alternate evaporators are defrosted in accordance with a timing system using a defrost technique that evaporates a single evaporator at a time while permitting the remaining evaporator or evaporators to continue to refrigerate the container interior.
A refrigerated icebox employs a cabinet that is internally corrugated to provide a multiplicity of lengthwise channels for air flow within the enclosure defined. The cabinet has a top wall that is provided with an opening to accommodate a drop-in refrigeration unit, and it is, in the main, integrally formed as a single piece.
A freezer/refrigerator car equipped with a freezer/refrigerator having a carry-in/out opening formed at a rear end thereof for carrying the goods in and out, and a door mechanism for opening and closing the carry-in/out opening, wherein the door mechanism includes a first door pivotably mounted on the one side wall of the freezer/refrigerator, a second door pivotably mounted on the other side wall of the freezer/refrigerator, and a third door pivotably mounted on the other side of the second door, and an air curtain unit is disposed on the inside surface of the first door and blows out the air toward the other side wall across the carry-in/out opening in a state where the first door is closed.
A broad range cooling system is provided which can operate to cool a product load to a predetermined temperature in the range of -25.degree. F. to +75.degree. F. over an ambient temperature range of -60.degree. F. to 150.degree. F. The system includes two compressor systems which are configurable to operate independently as single compressor cooling systems each having a unique cooling range, or together as a cascade system, depending upon the desired temperature requirements of the load and the ambient. In the event of a failure of one or the other compressor, the system is configured to continue operation with the other compressor as a single compressor system until a repair can be affected.
A broad range cooling system is provided which can operate over a temperature range of -25.degree. F. to 75.degree. F. under any expected ambient temperatures. The system includes two compressor systems which are configurable to operate independently and as a cascade system to provide multiple cooling temperatures for multiple loads each having a particular temperature requirement. There are multiple evaporator systems for cooling air which is used to cool the product; one evaporator system for each desired temperature. Each evaporator system is provided a thermal expansion valve, a corresponding thermostatic bulb and a thermostat to control the temperature in a corresponding chamber. The container is partitioned into chambers, each chamber having an evaporator system so that each evaporator system provides positive temperature control within its chamber. An evaporator pressure regulator is provided to manitain the evaporator pressure higher and thereby allow the several evaporators to maintain different pressures. The cascade cooling mode utilizing both compressors provides additional cooling capability for allowing even more temperature selectivity below 0.degree. F.
A broad range cooling system is provided which can operate over a temperature range of -25.degree. F. to 75.degree. F. under any expected ambient temperatures. The system includes two compressor systems which are configurable to operate independently, or as a cascade system, depending upon the desired temperature requirements of the load in relation to the ambient. There are two separate evaporator systems for cooling air which is used to cool the product; one evaporator system for each compressor. In single compressor mode, the selected compressor is used to cool its respective evaporator system and each compressor system is automatically configured to utilize the primary condenser to convert hot gas to a liquid. In cascade cooling mode, the lower compressor system is automatically reconfigured to utilize an evaporator side of a heat exchanger to convert hot gas to a liquid and to utilize the primary condenser to evaporate the liquid to a cold gas while absorbing heat. The upper cascade compressor system is automatically reconfigured to use the primary condenser to convert hot gas to a liquid and to use its respective evaporator for cooling the load. In the event of a failure of one or the other compressor, the system is configured to continue operation with the other compressor until a repair can be affected.
