When a refrigerant evaporation temperature of an interior evaporator cannot be set lower than a dew-point temperature of air flowing into the interior evaporator in a heating operation, a refrigerant circuit is switched to a normal heating operation mode in which a flow rate of the refrigerant flowing into the interior evaporator is set to zero by allowing the refrigerant to flow toward a bypass passage. In a case where the air cannot be dehumidified by the interior evaporator, an unnecessary heat exchange between the air and the refrigerant in the interior evaporator can be suppressed. Thus, the energy of the vehicle air conditioner can be effectively prevented from being wasted.

A direct current power supply device includes a rectifier circuit that rectifies alternating current power supplied from an alternating current power supply and converts the alternating current power into direct current power, a charge storage unit that includes a function of storing a charge, a charger that charges the charge storage unit, and a heat sink. The charger includes a positive-side switching element, a negative-side switching element, a positive-side backflow prevention diode, and a negative-side backflow prevention diode. The positive-side switching element, the negative-side switching element, the positive-side backflow prevention diode, and the negative-side backflow prevention diode are discrete semiconductor elements. The negative-side backflow prevention diode is a full mold package element. The positive-side switching element, the negative-side switching element, and the positive-side backflow prevention diode are elements that are not full mold packages.

The present invention relates to a vehicular air conditioning system and provides a vehicular air conditioning system capable of preventing overheating of an inverter that controls the rotation speed of an electric compressor without cutting off the inverter, and consequently preventing the stoppage of an air conditioner due to the cut-off of the inverter and the resultant stoppage of cooling of a passenger room. The vehicular air conditioning system includes an electric compressor, an inverter configured to control a rotation speed of the electric compressor, and a control part configured to execute control so that a refrigerant flow rate on an inlet side of the electric compressor increases when a temperature of the inverter is equal to or higher than a preset overheating warning temperature.

Provided is an air conditioning system capable of detecting in advance a device that consumes more power than the power that can be fed by a power feed unit. An air conditioning system includes a refrigerant cycle, a power feed unit, and a controller. The refrigerant cycle includes an outdoor unit and a plurality of indoor units. In a case where a power source for at least one indoor unit of the plurality of indoor units has been interrupted, the power feed unit feeds power from an auxiliary power source to the indoor unit for which the power source has been interrupted. When a predetermined device has been connected to at least part of the plurality of indoor units and the power feed unit, the controller performs deactivation of at least one of functions of the device.

A refrigeration apparatus includes a refrigerant circuit in which a compressor, a condenser, a liquid receiver, a first opening-and-closing valve, an expansion valve, and an evaporator are connected sequentially by pipes and through which refrigerant circulates. The refrigerant is HFO1123 or a refrigerant mixture containing HFO1123. A ratio of a refrigeration capacity to an opening area of the first opening-and-closing valve is within a range of 0.25 to 0.6 (kW/mm.sup.2).

A vehicle air conditioner includes a heat pump cycle and a refrigerant-circuit controller. The heat pump cycle includes an inside heat exchanger and a refrigerant-circuit switching device. The inside heat exchanger performs heat exchange between a refrigerant and a blown air that is to be blown into a vehicle compartment. The refrigerant-circuit switching device switches between a refrigerant circuit of a cooling mode and a refrigerant circuit of a non-cooling mode. The refrigerant-circuit controller selects the cooling mode or the non-cooling mode based on an air-conditioning load, the refrigerant-circuit controller controlling an operation of the refrigerant-circuit switching device. Upon selecting the non-cooling mode, the refrigerant-circuit controller starts performing a cooling-mode unallowable control in which the refrigerant circuit of the cooling mode is prohibited from being selected regardless of the air-conditioning load.

An inverter-integrated electric compressor includes an inverter housing portion, an inverter device including a substrate having an inverter circuit mounted thereon, the inverter device being integrally incorporated in the inverter housing portion, and a busbar assembly formed by a UVW busbar covered by a resin case, the UVW busbar conducting AC power converted by the inverter circuit from the substrate side to a motor terminal. In such a compressor, the busbar assembly includes an adhering partition adhered to an end surface of the substrate using an adhesive, the adhering partition being provided in an upright manner on a lower surface of the resin case of the busbar assembly; a height (H) and a gap (S) of the adhering partition relative to the end surface of the substrate are set as appropriate; and the adhering partition and the end surface of the substrate are adhered to each other using the adhesive.

A refrigeration cycle apparatus includes a compressor, a condenser, a pressure reducing mechanism and an evaporator and use a working fluid containing a hydrofluoroolefin (HFO). The compressor, condenser, pressure reducing mechanism and evaporator are connected with a pipeline to form a refrigeration cycle. A deoxidizing portion where the working fluid is brought into contact with a desiccant or a deoxidizer is provided at any place within the refrigeration cycle.

In order to achieve a reduction in energy consumption in a cooling water supply device without using a database, an equipment control device (70a) of a cooling water supply device: uses the load of a chiller, and a cooling water outlet temperature lower limit setpoint determined in accordance with the set temperature for the cooling water outlet of the chiller, to set a cooling water inlet temperature lower limit setpoint; sets, as the cooling water inlet temperature setpoint, the higher of the lower limit setpoint and the cooling water inlet temperature lower limit value as determined from the outside wet-bulb temperature; and generates a control command for a cooling tower fan and a control command for the cooling water flow volume, so as to match the cooling water inlet temperature and the cooling water outlet temperature respectively with the cooling water inlet temperature setpoint and the cooling water outlet temperature lower limit setpoint which have been set.

A compressor driving device includes: a controller that PWM drives a compressor; an inverter circuit unit that supplies power to an electric motor included in the compressor; a drive circuit that drives the inverter circuit unit according to a control signal; a voltage detector that detects a voltage that is output to the electric motor; and a current detector that detects a current that is output to the electric motor. When a product of a detection value of the voltage detector and a detection value of the current detector is greater than a predetermined comparison value, a duty ratio of the control signal is reduced to cause the input power supplied to the electric motor by the inverter circuit unit to have a predetermined input power level or less.