Abstract: A refrigerating device is provided in which a compressor, a gas cooler, an expansion mechanism and an evaporator are sequentially connected by using refrigerant pipes. The refrigerating device uses a refrigerant mixture in which a combustible nature refrigerant and a carbon dioxide refrigerant are mixed, and an amount of the carbon dioxide refrigerant in the mixture refrigerant is 20 to 50 mass %. Alternatively, a maximum fill amount of the combustible nature refrigerant is 150 g. Therefore, the refrigerating device has a higher coefficient of performance, a high refrigerating capacity and its safety is higher than that of using only hydrocarbon refrigerant.

Abstract: There is provided a drier which can shorten drying time of an article to be dried to greatly reduce the amount of energy consumption. A refrigerant circuit is disposed, which is constituted by sequentially installing and connecting a compressor, a gas cooler, an expansion valve and an evaporator in an annular shape. A blower is disposed, which circulates air in a drying chamber to exchange heat with the gas cooler and the evaporator. Moisture contained in the air which dries the article contained in the drying chamber is condensed to be discarded by the evaporator.

Abstract: In a heat pump apparatus that having a refrigerating cycle including a compressor 1, a gas cooler 3, a pressure reducing device 5 and an evaporator 7 and is designed so that water can be heated by the gas cooler, refrigerant such as CO2 or the like working in a supercritical area is filled and used at a high-pressure side in the refrigerating cycle and a radiator 21 is equipped between the exit of the gas cooler and the pressure reducing device. The refrigerant temperature at the exit of the radiator is kept to a substantially fixed temperature irrespective of the temperature of hot water to the gas cooler.

Abstract: An automatic vending machine is provided in which the exhausted heat produced by cooling is utilized effectively and decrease in running costs is accomplished. The automatic vending machine includes primary heat unit 31 having compressor 52 and primary heat exchanger 53 and secondary heat unit 30B having secondary heat exchanger 43B. The primary heat exchanger 53 is connected with refrigerant-ejecting pipe 32 and refrigerant return pipe 33 attached to the compressor through valves 34A and 34B, respectively, so that changing over is allowed. High-pressure gas pipe 36 connected with the refrigerant-ejecting pipe, low-pressure gas pipe 37 connected with the refrigerant return pipe and liquid pipe 38 connected with the primary heat exchanger are provided. These secondary heat exchangers are connected to the high-pressure gas pipe and the low-pressure gas pipe through valves 39A and 39B selectively operated. The secondary heat units are provided in compartments of the automatic vending machine.

Abstract: An automatic vending machine is provided in which the exhausted heat produced by cooling is utilized effectively and decrease in running costs is accomplished.

Abstract: In a method and an apparatus for injecting mixed refrigerant into a refrigerant circuit comprising at least a compressor, a condenser, an expansion device and an evaporator which are connected to one another through a refrigerant pipe, the mixed refrigerant is intermittently injected from a refrigerant bomb at a predetermined position of a low pressure side of the refrigerant circuit while keeping the mixed refrigerant in a liquid state. The intermittent injection operation (amount) of the liquid refrigerant into the refrigerant circuit may be controlled on the basis of the degree of superheat of the mixed refrigerant in the refrigerant circuit.

Abstract: An air conditioner has an outdoor unit and a plurality of room units supplied with a refrigerant from the outdoor unit. The outdoor unit and the room units are connected by a plurality of refrigerant pipes. In a recovery operation for returning refrigerator oil from the room units, the refrigerant pipes and the like to the outdoor unit, the plurality of room units are divided into a plurality of room unit groups, and the recovery operation of the refrigerant is carried out for each of the room unit groups.

Abstract: An air conditioner using a non-azeotropic mixture refrigerant formed of a high boiling-point refrigerant and a low boiling-point refrigerant is provided with a first temperature sensor for detecting a temperature at an inlet of an outdoor heat exchanger when the outdoor heat exchanger serves as an evaporator in heating cycle, a second temperature sensor for detecting an outside air temperature, and a controller for controlling an opening degree of an expansion valve on the basis of a temperature difference between the outside air temperature and the inlet temperature of said evaporator. For example, the opening degree of the expansion valve is controlled so that the temperature difference between the outside air temperature and the inlet temperature is equal to a predetermined value.

Abstract: In a multiroom air-conditioning apparatus, refrigerant flow between plural outdoor side units is controlled so that abnormality (lack or excess) of refrigerant amount in an outdoor side unit in operation is redressed. For example, when surplus refrigerant exists in an outdoor side unit, the refrigerant flow is so controlled that the surplus refrigerant is pushed out (flow out) into an outdoor side unit in non-operation. In addition, the output of the air-conditioning apparatus is smoothly variable (controllable) in accordance with an air-conditioning load over the whole air-conditioning load range from the minimum (zero) load to the maximum load.