Abstract: A container refrigeration device aims to improve dehumidification performance of the container refrigeration device. The container refrigeration device is configured to perform, in accordance with a dehumidification load, first dehumidification control under which air having passed through an evaporator is heated by exchanging heat with a refrigerant in a reheat heat exchanger, and blown into an inside of a container, and second dehumidification control under which a pressure of the refrigerant discharged from a compressor and flowing into the reheat heat exchanger is caused to be higher than a pressure of the refrigerant discharged from the compressor under the first dehumidification control, and a flow rate of the refrigerant discharged from the compressor is regulated such that a temperature inside the container is within a predetermined temperature range.

Abstract: A container refrigeration device aims to prevent low temperature damage to freight in a container. The container refrigeration device includes: a temperature controlling section (101) configured to perform, in a switchable manner, first temperature control under which a temperature inside the container (C) is controlled based on a blown air temperature (Tss) and second temperature control under which the temperature inside the container (C) is controlled based on a suction air temperature (Trs) during dehumidification operation; and a control switching section (103) configured to switch the first temperature control to the second temperature control when the blown air temperature (Tss) is higher than the suction air temperature (Trs) during the dehumidification operation in which part of a refrigerant discharged from a compressor (30) is allowed to flow into a reheat heat exchanger (83).

Abstract: A method for detecting whether a different refrigerant has been charged into a refrigeration apparatus including a refrigerant circuit includes: a charging step of charging a refrigerant into the refrigerant circuit; a characteristics determination step of determining whether saturation temperature characteristics of the refrigerant charged in the charging step are identical to saturation temperature characteristics of a previously determined normal refrigerant, the saturation temperature characteristics of the refrigerant being derived from a pressure and a temperature of the refrigerant; and an alerting step of, when, in the characteristics determination step, a determination is made that the saturation temperature characteristics of the charged refrigerant are different from those of the normal refrigerant, issuing an alarm indicating that the charged refrigerant is different from the normal refrigerant.

Abstract: According to the present disclosure, in a container refrigeration apparatus configured to cool the inside of a container, the accuracy of determination of occurrence of a lock abnormality and a connection abnormality of a motor is increased, and erroneous detection of the motor abnormalities is reduced or prevented. The container refrigeration apparatus of the present disclosure includes an abnormality determinator configured to compare a value for current flowing through an in-compartment motor with a preset current threshold to determine occurrence of the motor abnormalities of the in-compartment motor, and a threshold changer configured to change the current threshold of the abnormality determinator in accordance with a supply voltage for each supply frequency of a power supply configured to supply power to the in-compartment motor.

Abstract: A two-stage cascade refrigerating system including a primary side refrigerant circuit, and at least one secondary side refrigerant circuit. The receiver of the primary refrigerant circuit is arranged such that a first pipe is introduced to the inside of the container such that an open of the first pipe is located at an inside upper portion of the container, and a second pipe is introduced to the inside of a container such that an open end of the second pipe is located at an inside lower portion of the container. The receiver of the secondary side refrigerant circuit(s) is reversible in refrigerant circulation and is arranged such that a first pipe and a second pipe are introduced to the inside of the container such that open ends of both pipes are located at an inside lower position of the container.

Abstract: A cold-insulation container is disclosed which includes a cold-insulation container main body (1) which is a heat-insulation structure and a door (2) for opening and closing an opening portion (4) of the cold-insulation container main body (1). Provided in the cold-insulation container main body (1) are a refrigerating apparatus (19) and a cold-storage device (20) which is cooled by the refrigerating apparatus (19) and stores cold. An external wall of the cold-insulation container main body (1) and the door 2 are formed from a synthetic resin material.

Abstract: The refrigerating system includes a low stage side refrigerant circuit (2) formed by connecting a low stage side compressor (4), a cascade condenser (5), a low stage side receiver (6), a low stage side expansion valve (7) formed of a temperature-sensitive expansion valve and an evaporator (8) in this order. The system also includes a high stage side refrigerant circuit (3) formed by connecting a high stage side compressor (9), a condenser (10), a high stage side receiver (11), a high stage side expansion valve (12) formed of a motor-operated expansion valve and the cascade condenser (5) in this order. The opening of the high stage side expansion valve (12) is adjusted so that the pressure sensed by a high-pressure sensor (SPH2) for sensing the high pressure in the low stage side refrigerant circuit (2) reaches a predetermined target high pressure.

Abstract: It includes a heat source side refrigerant circuit (70) having a plurality of refrigerant heat exchangers (50, 60), and a plurality of user-side refrigerant circuits (11, 21). A high pressure gas pipe (LG-H) is connected to the discharge side of outdoor compressors (41, 42) of the heat source side refrigerant circuit (70), a low pressure gas pipe (LG-L) to the suction side of the outdoor compressors (41, 42), and a liquid pipe (LL) to the liquid side of outdoor heat source side heat exchangers (45, 46). The liquid pipe (LL) is connected to one end side of each refrigerant heat exchanger (50, 60). The other end side of the respective refrigerant heat exchangers (50, 60) can be switched by three-way valves (52, 62) between a state where it is communicated to the high pressure gas pipe (LG-H) and another state where it is communicated to the low pressure gas pipe (LG-L). The liquid pipe (LL) is connected to one end side of a user-side heat exchanger (31) of the heat source side refrigerant circuit (70).

Abstract: A first refrigeration circuit for a refrigerating apparatus which is formed into a two-stage cascade refrigerating cycle by establishing connection between a high temperature-side refrigerant circuit and a low temperature-side refrigerant circuit through a refrigerant heat exchanger, and a second refrigeration circuit which is formed into a refrigerating cycle different from that of the first refrigeration circuit are provided. A liquid piping line of the high temperature-side refrigerant circuit and a liquid piping line of the second refrigeration circuit are connected together through a first connection piping line and a suction-side gas piping line of the high temperature-side refrigerant circuit and a suction-side gal line of the second refrigeration circuit are connected together through a second connection piping line.

Abstract: A first refrigeration circuit (1) for a refrigerating apparatus (6) which is formed into a two-stage cascade refrigerating cycle by establishing connection between a high temperature-side refrigerant circuit (3) and a low temperature-side refrigerant circuit (4) through a first refrigerant heat exchanger (5A), a second refrigeration circuit (2) which is formed into a refrigerating cycle different from that of the first refrigeration circuit (1), and a second refrigerant heat exchanger (5B) connected to the low temperature-side refrigerant circuit (4) are provided. The second refrigerant heat exchanger (5B) is connected, through connection piping lines (41, 42), to a liquid piping line (36a) and a suction-side gas piping line (36b) of the second refrigeration circuit (2).

Abstract: An outdoor unit (1), a parent unit (2), a plurality of child freezers, and a plurality of child refrigerators are provided. The child freezers are disposed in individual frozen display cases, while the child refrigerators are disposed in individual refrigerated display cases. A refrigerant heat exchanger (5) is disposed in only the parent unit (2). The outdoor unit (1) and the refrigerant heat exchanger (5) form a primary refrigerant circuit. A secondary refrigerant circuit is provided in the parent unit (2). Refrigerant circulates through the secondary refrigerant circuit, passing through the refrigerant heat exchanger (5). Each child freezer is provided with a refrigeration utilization side heat exchanger (3c) and the heat exchanger (3c) and the refrigerant heat exchanger (5) form a secondary refrigerant circuit through which refrigerant circulates.

Abstract: In a refrigerating/air-conditioning system for a supermarket, a single outdoor unit (60) is connected to a plurality of application units (11, 21, 31, 41, 51), which are connected in parallel to each other. The application units (11, 21, 31, 41, 51) are classified into application units (11, 21, 31) of a first type for forming a two-stage refrigerating cycle with the outdoor unit (60) and application units (41, 51) of a second type for forming a one-stage refrigerating cycle with the outdoor unit (60). The application units (11, 21, 31) of the first type are applied to a freezing showcase (10), a chilling showcase (20) and a storehouse (30), respectively. The application units (41, 51) of the second type are applied to a food processing chamber (40) and a general air-conditioned room (50), respectively.

Abstract: A higher temperature side unit having a higher temperature side compressor and a condenser to form a higher temperature refrigeration cycle is disposed at a position higher than a position where a lower temperature side unit forming a lower temperature refrigeration cycle is disposed. The higher temperature side unit is provided with a bypass passage which allows refrigerant to bypass the higher temperature side compressor. A shut-off valve is disposed in the bypass passage. When an open-air temperature sensed by an open-air thermometric sensor is low, the higher temperature side compressor is deactivated and the bypass passage is opened, so that refrigerant naturally circulates in the higher temperature refrigeration cycle.