Abstract: There is provided a cooling apparatus which can improve a cooling efficiency while preventing an abnormal increase in pressure of a high side. The cooling apparatus comprises: a refrigerant circuit which uses carbon dioxide as a refrigerant; a control device which controls a speed of rotation of the compressor between predetermined lowest and highest speeds; and a cooled state sensor which detects a cooled state in a refrigerator main body to be cooled by an evaporator included in the refrigerant circuit. The control device increases a highest speed of rotation of the compressor if a temperature in the chamber of the refrigerator main body detected by the cooled state sensor is low.

Abstract: There is provided a heating/cooling system capable of reducing power consumption. The heating/cooling system has a receiving room capable of using hot air and cold air in a switching manner, and comprises a refrigerant circuit which comprises a compressor, a gas cooler, a radiator, an expansion valve, an evaporator, and the like, in which carbon dioxide is sealed as a refrigerant, and whose high pressure side becomes supercritical pressure. The inside of the receiving room is heated by the radiator and cooled by the evaporator.

Abstract: A refrigerant system 1D comprises a heat insulating housing 3 provided with an accommodating space inside and a refrigeration unit 9 attached to a lower portion of the heat insulating housing 3, in which a compressor 5, a gas cooler 6, an internal heat exchanger 10, a restriction means 16 and an evaporator 8 accommodated in a heat insulating case 7A are disposed on a unit base 4. The gas cooler 6 and the heat insulating case 7A are disposed so that air heat-exchanged by the gas cooler 6 moves toward the heat insulating case 7A, an air passage T is provided between the unit base 4 and the heat insulating case 7A, the air heat-exchanged by the gas cooler 6 is passed through the air passage T to be discharged outside, and the internal heat exchanger 10 is disposed in such a manner that it is embedded in a heat insulating material layer 7C provided around the heat insulating case 7A to be provided with a heat insulation property.

Abstract: There is provided a cooling apparatus which can improve a cooling efficiency while preventing an abnormal increase in pressure of a high side. The cooling apparatus comprises: a refrigerant circuit which uses carbon dioxide as a refrigerant; a control device which controls a speed of rotation of the compressor between predetermined lowest and highest speeds; and a cooled state sensor which detects a cooled state in a refrigerator main body to be cooled by an evaporator included in the refrigerant circuit. The control device increases a highest speed of rotation of the compressor if a temperature in the chamber of the refrigerator main body detected by the cooled state sensor is low.

Abstract: There is provided a cooling apparatus which can prevent an abnormal increase in pressure of a high side at the time of starting. The cooling apparatus comprises: a refrigerant circuit which uses carbon dioxide as a refrigerant; and a control device which controls a speed of rotation for the compressor between predetermined lowest and highest speeds. The control device runs the compressor by holding a predetermined start-time holding speed of rotation lower than the lowest rotational speed for a predetermined time before the lowest rotational speed is reached after the compressor is started.

Abstract: There is provided a cooling apparatus which can improve cooling efficiency of an evaporator while preventing freezing of articles housed in a cooled space thereof. The cooling apparatus comprises: a control device which controls a compressor; and a temperature sensor in the chamber which can detect a cooled state in a refrigerator main body to be cooled by the evaporator. The control device stops running of the compressor if the compressor is continuously run for a predetermined time, and changes the continuous running time of the compressor for stopping the same based on a temperature in the chamber of the refrigerator main body detected by the temperature sensor in the chamber.

Abstract: It is an object of the present invention to provide a refrigerant cycle apparatus which can optimize the capability of releasing heat from a refrigerant in a gas cooler and an auxiliary heat exchanger under use conditions at a low cost. There are provided an intermediate cooling circuit which once releases heat from a refrigerant discharged from a compressor and then returns the refrigerant to the compressor, and a fan which ventilates an inter cooler of the intermediate cooling circuit and a gas cooler. The inter cooler has substantially the same ventilation area as that of the gas cooler.

Abstract: There is disclosed a refrigerant cycle apparatus capable of avoiding occurrence of an abnormal rise in a pressure on a high-pressure side in advance, comprising: a throttling mechanism including a first capillary tube, and a second capillary tube which is connected in parallel to the first capillary tube and whose flow path resistance is smaller than that of the first capillary tube; and a valve device for controlling refrigerant circulation into the first and second capillary tubes, so that a refrigerant is passed into the second capillary tube at the time of starting of a compressor.

Abstract: There is provided a cooling apparatus which can improve a cooling efficiency while preventing an abnormal increase in pressure of a high side. The cooling apparatus comprises: a refrigerant circuit which uses carbon dioxide as a refrigerant; a control device which controls a speed of rotation of the compressor between predetermined lowest and highest speeds; and a cooled state sensor which detects a cooled state in a refrigerator main body to be cooled by an evaporator included in the refrigerant circuit. The control device increases a highest speed of rotation of the compressor if a temperature in the chamber of the refrigerator main body detected by the cooled state sensor is low.

Abstract: The present invention aims to prevent the occurrence of liquid compression at the second rotary compression element before it happens while improving the compression efficiency with an intermediate cooling circuit in a refrigerant cycle apparatus which comprises an internal high-pressure type multi-stage compression compressor, and the invention is summarized in that the apparatus comprises an intermediate cooling circuit which allows refrigerant discharged from the first rotary compression element of a compressor to dissipate heat, where a microcomputer performs control on the number of revolutions of the compressor to maintain the temperature/pressure of refrigerant so that the refrigerant does not condense at the output of the intermediate cooling circuit, where such a control is done in response to outputs from an outside-air temperature sensor, a refrigerant temperature sensor, and a signal from a controlling apparatus of a refrigerating apparatus body.

Abstract: An object of the present invention is to provide a refrigerant cycle apparatus which can reduce a production cost while hastening equalization of pressure in a refrigerant circuit after a compressor is stopped, the apparatus comprises a bypass circuit which causes an intermediate-pressure area to communicate with a low-pressure side of a refrigerant circuit, a valve device provided to this bypass circuit and a control device which controls opening/closing of this valve device, and the control device constantly closes the valve device but opens it in order to release a flow path of the bypass circuit concurrently with the stop of the compressor.

Abstract: A heat exchanger is provided in which high heat transfer efficiency has been attained by optimizing the slit array and setting an optimum range for the width of a slit and the spacing between slits. Slits 51 and 52 formed in front of the heat transfer coil 4 and slits 55 and 56 formed behind the heat transfer coil are arranged so as to provide a mutually different length among adjoining partitioned slits in the vertical direction, as well as a mutually different length between directly opposite partitioned slits in the horizontal direction. As a result, the position at which the slit is partitioned is staggered.

Abstract: An object is to improve cooling efficiency while preventing an abnormal increase in pressure of a high side in a cooling apparatus which uses so-called carbon dioxide as a refrigerant. The cooling apparatus comprises a refrigerant circuit in which a compressor, a gas cooler, pressure reducing means, an evaporator and the like are connected in an annular shape, and carbon dioxide is sealed as a refrigerant. In a stable running state in which a temperature of a space to be cooled by the evaporator is cool, time after a start of the compressor until a difference between outlet and inlet temperatures of the evaporator becomes within 1 degree is 5 minutes or more to less than 20 minutes.

Abstract: A heat exchanger is provided in which high heat transfer efficiency has been attained by optimizing the slit array and setting an optimum range for the width of a slit and the spacing between slits. Slits 51 and 52 formed in front of the heat transfer coil 4 and slits 55 and 56 formed behind the heat transfer coil are arranged so as to provide a mutually different length among adjoining partitioned slits in the vertical direction, as well as a mutually different length between directly opposite partitioned slits in the horizontal direction. As a result, the position at which the slit is partitioned is staggered. The two slits 53 and 54 formed side by side between heat transfer coil 4 and heat transfer coil 4 are of the same length. For a 7 mm diameter heat transfer coil, the slit width relative to the diameter of the heat transfer coil ranges from 1.2/7 (approximately 0.17) to 2.0/7 (approximately 0.29), and the slit spacing relative to the diameter of the heat transfer coil ranges from 1.

Abstract: A refrigerant system 1D comprises a heat insulating housing 3 provided with an accommodating space inside and a refrigeration unit 9 attached to a lower portion of the heat insulating housing 3, in which a compressor 5, a gas cooler 6, an internal heat exchanger 10, a restriction means 16 and an evaporator 8 accommodated in a heat insulating case 7A are disposed on a unit base 4. The gas cooler 6 and the heat insulating case 7A are disposed so that air heat-exchanged by the gas cooler 6 moves toward the heat insulating case 7A, an air passage T is provided between the unit base 4 and the heat insulating case 7A, the air heat-exchanged by the gas cooler 6 is passed through the air passage T to be discharged outside, and the internal heat exchanger 10 is disposed in such a manner that it is embedded in a heat insulating material layer 7C provided around the heat insulating case 7A to be provided with a heat insulation property.

Abstract: There is provided a heating/cooling system capable of reducing power consumption. The heating/cooling system has a receiving room capable of using hot air and cold air in a switching manner, and comprises a refrigerant circuit which comprises a compressor, a gas cooler, a radiator, an expansion valve, an evaporator, and the like, in which carbon dioxide is sealed as a refrigerant, and whose high pressure side becomes supercritical pressure. The inside of the receiving room is heated by the radiator and cooled by the evaporator.

Abstract: An object of the present invention is to provide a refrigerant cycle apparatus which can reduce a production cost while hastening equalization of pressure in a refrigerant circuit after a compressor is stopped, the apparatus comprises a bypass circuit which causes an intermediate-pressure area to communicate with a low-pressure side of a refrigerant circuit, a valve device provided to this bypass circuit and a control device which controls opening/closing of this valve device, and the control device constantly closes the valve device but opens it in order to release a flow path of the bypass circuit concurrently with the stop of the compressor.

Abstract: An object is to improve cooling efficiency while preventing an abnormal increase in pressure of a high side in a cooling apparatus which uses so-called carbon dioxide as a refrigerant. The cooling apparatus comprises a refrigerant circuit in which a compressor, a gas cooler, pressure reducing means, an evaporator and the like are connected in an annular shape, and carbon dioxide is sealed as a refrigerant. In a stable running state in which a temperature of a space to be cooled by the evaporator is cool, time after a start of the compressor until a difference between outlet and inlet temperatures of the evaporator becomes within 1 degree is 5 minutes or more to less than 20 minutes.

Abstract: There is provided a cooling apparatus which can improve cooling efficiency of an evaporator while preventing freezing of articles housed in a cooled space thereof. The cooling apparatus comprises: a control device which controls a compressor; and a temperature sensor in the chamber which can detect a cooled state in a refrigerator main body to be cooled by the evaporator. The control device stops running of the compressor if the compressor is continuously run for a predetermined time, and changes the continuous running time of the compressor for stopping the same based on a temperature in the chamber of the refrigerator main body detected by the temperature sensor in the chamber.

Abstract: There is provided a cooling apparatus which can prevent an abnormal increase in pressure of a high side at the time of starting. The cooling apparatus comprises: a refrigerant circuit which uses carbon dioxide as a refrigerant; and a control device which controls a speed of rotation for the compressor between predetermined lowest and highest speeds. The control device runs the compressor by holding a predetermined start-time holding speed of rotation lower than the lowest rotational speed for a predetermined time before the lowest rotational speed is reached after the compressor is started.