Abstract: An indoor fan, an indoor heat exchanger, and refrigerant piping are housed in a casing having an air inlet and air outlets. An air conditioning indoor unit includes a first temperature sensor that measures a temperature of air in an air conditioning target space, a second temperature sensor that measures a temperature of the refrigerant piping, and a determining component that determines if there is refrigerant leakage while operation is stopped. The determining component performs a refrigerant leakage determination that is a determination whether there is refrigerant leakage based on a difference between the temperatures detected by the first temperature sensor and the second temperature sensor.

Abstract: A refrigeration apparatus includes a primary circuit with a first expansion valve, a bypass circuit extending between branching and joining portions on the refrigerant primary circuit, a heat exchanger, a second expansion valve disposed upstream of the heat exchanger in the bypass circuit, first and second refrigerant flow rate calculating components, and a determining component. The primary circuit also includes a compressor, radiator, and evaporator. The heat exchanger includes first and second refrigerant flow paths disposed on the primary and bypass circuits, respectively, to cause heat between refrigerant flowing in the paths. The first and second refrigerant flow rate calculating components calculate first and second flow rates of refrigerant flowing through the bypass circuit based on refrigeration cycle theory and fluid theory, respectively.

Abstract: A laser device includes a light-emitting unit that generates a laser beam, an amplification unit that amplifies the laser beam generated by the light-emitting unit, a power supply unit that supplies power for generating the laser beam to the light-emitting unit, a plate-like cooling unit including a first cooling surface and a second cooling surface positioned opposite to the first cooling surface, and a housing in which the light-emitting unit, the amplification unit, the power supply unit, and the cooling unit are housed. The power supply unit and the light-emitting unit are arranged adjacent to the first cooling surface of the cooling unit. The amplification unit is arranged adjacent to the second cooling surface of the cooling unit.

Abstract: As a shut-off valve inspection process for checking operation of a liquid side shut-off valve and a gas side shut-off valve, an air conditioning system operates a compressor in a cooling cycle state, performs opening and closing operation of the liquid side shut-off valve and the gas side shut-off valve, and determines whether the liquid side shut-off valve and the gas side shut-off valve properly operate on the basis of a temperature value detected by a temperature sensor provided in an indoor unit.

Abstract: A refrigeration apparatus includes a primary circuit with a first expansion valve, a bypass circuit extending between branching and joining portions on the refrigerant primary circuit, a heat exchanger, a second expansion valve disposed upstream of the heat exchanger in the bypass circuit, first and second refrigerant flow rate calculating components, and a determining component. The primary circuit also includes a compressor, radiator, and evaporator. The heat exchanger includes first and second refrigerant flow paths disposed on the primary and bypass circuits, respectively, to cause heat between refrigerant flowing in the paths. The first and second refrigerant flow rate calculating components calculate first and second flow rates of refrigerant flowing through the bypass circuit based on refrigeration cycle theory and fluid theory, respectively.

Abstract: An optical amplifying system is disclosed. The optical amplifying system includes a thermo-electric cooler (TEC), and a semiconductor laser diode (LD) mounted on the TEC. The semiconductor LD generating a modulated signal with a designed wavelength depending on a temperature thereof that is controlled by the TEC. The optical amplifying system further includes a semiconductor optical amplifier (SOA) that amplifies the modulated optical signal. A feature of the optical amplifying system is that the temperature of the SOA is higher than that of LD.

Abstract: To provide a laser device allowing the prevention of dew formation on a cooler of the laser device, while contributing to a longer lifetime of a humidity sensor to be used. A laser device includes a laser diode and a cooler for cooling the laser diode. The laser diode and the cooler are provided in a housing. The laser device includes: a humidity detector that detects humidity in the laser device while current is applied to the humidity detector; and a current application controller that controls the time of current application to the humidity detector. In one aspect of the laser device, the laser device further includes: a temperature detector that detects a temperature in the housing; and a dew point calculator that calculates a dew point based on the humidity detected by the humidity detector, and the temperature detected by the temperature detector.

Abstract: To provide a laser device allowing the prevention of dew formation on a cooler of the laser device, while contributing to a longer lifetime of a humidity sensor to be used. A laser device includes a laser diode and a cooler for cooling the laser diode. The laser diode and the cooler are provided in a housing. The laser device includes: a humidity detector that detects humidity in the laser device while current is applied to the humidity detector; and a current application controller that controls the time of current application to the humidity detector. In one aspect of the laser device, the laser device further includes: a temperature detector that detects a temperature in the housing; and a dew point calculator that calculates a dew point based on the humidity detected by the humidity detector, and the temperature detected by the temperature detector.

Abstract: A laser power-supply device including a power-supply unit including a voltage input unit into which an AC voltage is inputted, a rectifier circuit, and a plurality of sub-switching regulator units, and a light-emitting unit, in which the plurality of sub-switching regulator units is connected in parallel to output of the rectifier circuit, the light-emitting unit includes a plurality of sub-light-emitting units, each of the sub-light-emitting units includes one light-emitting element row, a current is supplied to the one light-emitting element row from each of the plurality of sub-switching regulator units, and each of the sub-switching regulator units includes a switching circuit, a smoothing circuit, a current detection circuit that detects an output current, and a control circuit that controls the switching circuit on the basis of a current command value and the detected output current.

Abstract: A gas laser oscillator includes laser gas circulation paths including first and second paths; a first discharge tube provided in the first path; a second discharge tube provided in the second path; a laser power supply for supplying a first high frequency power to the first discharge tube and supplying a second high frequency power having a different phase from the first high frequency power to the second discharge tube; and a matching unit including a first coil and a first capacitor, and a second coil and a second capacitor. Each value of the first coil, the first capacitor, the second coil, and the second capacitor is determined such that the difference between the peak value of a voltage applied to the first discharge tube and the peak value of a voltage applied to the second discharge tube falls within a predetermined range.

Abstract: A heat pump system includes a heat source unit having a variable-capacity compressor and a heat-source-side heat exchanger that functions as an evaporator for a refrigerant, and a plurality of usage units connected to the heat source unit and having usage-side heat exchangers that function as radiators for the refrigerant. The operating capacity of the compressor is controlled to bring the discharge pressure of the compressor, or a state quantity equivalent to the discharge pressure, to a first target value. The first target value is determined based on an equivalent target value equivalent to a usage temperature required in individual usage units.

Abstract: A laser power-supply device including a power-supply unit including a voltage input unit into which an AC voltage is inputted, a rectifier circuit, and a plurality of sub-switching regulator units, and a light-emitting unit, in which the plurality of sub-switching regulator units is connected in parallel to output of the rectifier circuit, the light-emitting unit includes a plurality of sub-light-emitting units, each of the sub-light-emitting units includes one light-emitting element row, a current is supplied to the one light-emitting element row from each of the plurality of sub-switching regulator units, and each of the sub-switching regulator units includes a switching circuit, a smoothing circuit, a current detection circuit that detects an output current, and a control circuit that controls the switching circuit on the basis of a current command value and the detected output current.

Abstract: A heat pump system includes a heat source unit, a discharge refrigerant communication tube, a liquid refrigerant communication tube, a gas refrigerant communication tube, a first usage unit and a second usage unit. The first usage unit has a first usage-side heat exchanger capable of functioning as a radiator of the heat-source-side refrigerant introduced from the discharge refrigerant communication tube. The first usage unit is capable of performing operation in which an aqueous medium is heated by radiation of the heat-source-side refrigerant in the first usage-side heat exchanger. The second usage unit has a second usage-side heat exchanger capable of functioning as an evaporator of the heat-source-side refrigerant introduced from the liquid refrigerant communication tube. The second usage unit is capable of performing operation in which an air medium is cooled by evaporation of the heat-source-side refrigerant in the second usage-side heat exchanger.

Abstract: A heat pump system includes a heat source unit, a usage-side unit, and a usage-side controller. The heat source unit has a heat source-side compressor for compressing a heat source-side refrigerant, and a heat source-side heat exchanger capable of functioning as an evaporator of the heat source-side refrigerant. The usage-side unit is connected to the heat source unit and has a capacity-variable-type usage-side compressor for compressing a usage-side refrigerant, a usage-side heat exchanger capable of functioning as a radiator of the heat source-side refrigerant and functioning as an evaporator of the usage-side refrigerant, and a refrigerant-water heat exchanger capable of functioning as a radiator of the usage-side refrigerant and heating an aqueous medium. The usage-side controller performs usage-side capacity variation control for incrementally varying the operating capacity of the usage-side compressor during a usual operation.

Abstract: A gas laser oscillator includes laser gas circulation paths including first and second paths; a first discharge tube provided in the first path; a second discharge tube provided in the second path; a laser power supply for supplying a first high frequency power to the first discharge tube and supplying a second high frequency power having a different phase from the first high frequency power to the second discharge tube; and a matching unit including a first coil and a first capacitor, and a second coil and a second capacitor. Each value of the first coil, the first capacitor, the second coil, and the second capacitor is determined such that the difference between the peak value of a voltage applied to the first discharge tube and the peak value of a voltage applied to the second discharge tube falls within a predetermined range.

Abstract: A heat pump system includes a heat source unit, a discharge refrigerant communication tube, a liquid refrigerant communication tube, a gas refrigerant communication tube, a first usage unit and a second usage unit. The first usage unit has a first usage-side heat exchanger capable of functioning as a radiator of the heat-source-side refrigerant introduced from the discharge refrigerant communication tube. The first usage unit is capable of performing operation in which an aqueous medium is heated by radiation of the heat-source-side refrigerant in the first usage-side heat exchanger. The second usage unit has a second usage-side heat exchanger capable of functioning as an evaporator of the heat-source-side refrigerant introduced from the liquid refrigerant communication tube. The second usage unit is capable of performing operation in which an air medium is cooled by evaporation of the heat-source-side refrigerant in the second usage-side heat exchanger.

Abstract: A refrigerant circuit includes a compressor, a heat source-side heat exchanger, and a usage-side heat exchanger capable of heating an aqueous medium. An aqueous medium circuit includes a circulation pump and the usage-side heat exchanger, and is connected to aqueous medium devices. An auxiliary heat source is provided at an outlet side of the usage-side heat exchanger in the aqueous medium circuit to further heat the aqueous medium. A heating capability computation unit computes a heating capability of the aqueous medium devices based on an operating state quantity of constituent devices or refrigerant flowing through the refrigerant circuit. A circulation flow rate computation unit computes a circulation flow rate of the aqueous medium based on an outlet/inlet temperature difference and the heating capability. A prediction unit predicts an outlet temperature of the aqueous medium in the auxiliary heat source based on the circulation flow rate and heat source capability information.

Abstract: An air conditioning apparatus has a refrigerant circuit made up of plural indoor units connected to an outdoor unit, and the air conditioning apparatus has a capacity controlling part and a target refrigerant temperature mode setting part. The capacity controlling part controls the air conditioning capacity of the outdoor unit in such a way that the evaporation temperature of refrigerant in the refrigerant circuit becomes a target evaporation temperature, or in such a way that the condensation temperature of the refrigerant becomes a target condensation temperature. The target refrigerant temperature mode setting part is configured to seta target refrigerant temperature mode to either a target refrigerant temperature changing mode or a target refrigerant temperature fixing mode.

Abstract: A heat pump system includes a heat-source-side refrigerant circuit and a controller. The heat-source-side refrigerant circuit has a plurality of usage units having usage-side heat exchangers. The plurality of usage units are connected to a heat source unit having a plurality of heat-source-side heat exchangers and a heat-source-side compressor configured to compress a heat-source-side refrigerant. The controller causes the plurality of heat-source-side heat exchangers to function as evaporators and radiators of heat-source-side refrigerant to perform an air-cooling operation and an air-warming operation using an aqueous medium. The heat pump system operates so that the heat-source-side condensing temperature is below 40° C. in the case that an outside air temperature is 25° C. or lower and the cooling and heating operations coexist.

Abstract: A heat pump system includes a refrigerant circuit and a controller. The refrigerant circuit has usage units connected to a heat source unit. The usage units have first usage-side heat exchangers and second usage-side heat exchangers. The heat source unit has heat-source-side heat exchanger and a compressor. The controller causes the heat-source-side heat exchanger to function as an evaporator or as a radiator in accordance with an overall heat load of the usage units when the heating operation or the cooling operation has been set for each of the usage units. The aqueous medium is heated by heat radiation of the refrigerant in the first usage-side heat exchangers in the heating operating, and is cooled by evaporation of the heat-source-side refrigerant in the second usage-side heat exchangers in the cooling operation.