Mitsubishi Denki Kabushiki Kaisha

Mitsubishi Electric Corporation

Keiji Yoshimura

Mitsunori Kori

Hideaki Yamada

Takayuki Hayakawa

Tatsuaki Umezaki

Kazuhiro Horita

Manabu Michishita

Takaaki Ando

There is provided an air-conditioning apparatus including an auxiliary power supply that, when a voltage from an overhead line extending over sections powered by different power sources is stepped down with a transformer, converts the voltage into a low-voltage DC voltage and that, when a voltage from the overhead line is a DC voltage, is directly fed with the voltage and converts it into the low-voltage DC voltage that is the same as the converted DC voltage, and further including an inverter device that converts the DC voltage from the auxiliary power supply into an AC voltage and that supplies the AC voltage to a drive unit of a refrigeration cycle apparatus.

Air-conditioner power supply system for multi-system train car

An outdoor unit disposed under a floor of a vehicle and including a compressor and an outdoor heat exchanger serving as a condenser during a cooling operation, an indoor unit disposed at a ceiling portion of the vehicle, including an indoor heat exchanger serving as an evaporator during the cooling operation, and connected to the outdoor unit by refrigerant pipes, and an inverter unit including a cooling heat exchanger serving as an evaporator, an air-conditioning inverter device, and a cooling air-sending device sucking outdoor air for heat exchange by the cooling heat exchanger and cooling the inverter device by cooled air obtained by the heat exchange are provided; and the cooling heat exchanger is connected in parallel to the outdoor unit by refrigerant pipes.

Vehicle air-conditioning apparatus

A file managing method includes subdividing an original file including records, each record including fields, for storing blocks, each block including fields subdivided from more than one of the records; coupling the blocks to into groups of blocks; rearranging the groups of blocks, and, after rearranging the groups of blocks, coupling the groups of blocks to each other to produce a transposed file; and accessing the fields from the transposed file, at random.

File managing method

This invention has an object of providing an air conditioner for a railway vehicle which can restrict a reduction in the introduced volume of outside air during a high-speed running of a vehicle and which can achieve lower noise. To achieve this object, the air conditioner for a railway vehicle includes an external cover 4 provided along the same surface as a vehicle surface, an air intake port 5 with a periphery provided on the external cover 4 and having a roundness in the cross-sectional configuration of an inside edge portion 12a of the intake port periphery, an air intake louver 11 disposed in the air intake port 5 to intersect a vehicle running direction, and an air exhaust port 3 for exhausting air that has been heat-exchanged, wherein an upper end surface 11a of the louver 11 is recessed from the surface of the exterior cover 4, and a cross-sectional configuration of the edge portion 11b of the upper end surface 11a has a roundness.

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Tokyo, Japan

Keiji Yoshimura