Mitsubishi Electric Corporation

Nec Corporation

Agc Inc.

Mitsubishi Eiectric Corporation

Hiroshi Sata

Takashi Ikeda

Tetsuya Yamashita

Koji Asakura

Koichi Higashi

Koichi Maeda

Ataru Nakamura

Kenichiro Toriumi

Hajime Fujimoto

Tomotaka Ishikawa

Kenichi Hata

Yusuke Arii

Fumitake Unezaki

Kohei Ueda

Yasutaka Ochiai

Abastari

Masahiko Nakagawa

Kousuke Tanaka

Takanori Yashiro

Hisato Morita

Seiya Tsurushima

A refrigeration apparatus includes: a refrigerant circuit through which refrigerant circulates; a controller to execute a plurality of refrigerant shortage sensing functions of sensing a shortage of an amount of the refrigerant; and an input device through which an operation mode to be set is input into the controller. The operation mode includes: a first mode in which energy-saving performance is emphasized; and a second mode in which the refrigeration apparatus is permitted to operate in a range in which reliability is ensured. In accordance with the operation mode set through the input device, the controller determines which one of sensing results obtained by the refrigerant shortage sensing functions is enabled and which one of sensing results obtained by the refrigerant shortage sensing functions is disabled. When a sensing result determined to be enabled shows a refrigerant shortage, the controller gives a notification about the refrigerant shortage.

Refrigeration apparatus having input operation modes

A refrigeration cycle apparatus is a refrigeration cycle apparatus having a refrigerant circuit having a compressor, a condenser, a supercooler, an expansion device, and an evaporator connected by a refrigerant pipe, and configured to circulate refrigerant containing refrigerant having a temperature gradient, wherein the supercooler sets a degree of supercooling of the refrigerant, which is a temperature difference between a temperature from the condenser to a refrigerant flow inlet of the supercooler and a temperature in a refrigerant flow outlet on a downstream side of the supercooler, to be larger than the temperature gradient generated at a time of refrigerant shortage of the refrigerant between the refrigerant flow inlet and the refrigerant flow outlet of the supercooler, the refrigeration cycle apparatus including a refrigerant amount determination unit configured to compare a determination threshold value set to a value larger than the temperature gradient of the refrigerant with the degree of supercooling of the refrigerant, and determine whether or not there is a shortage of a refrigerant amount filled in the refrigerant circuit.

Refrigeration cycle apparatus and refrigeration apparatus

The refrigerant device includes a refrigerant circuit, an injection circuit, an inlet temperature sensor, an outlet temperature sensor, and a controller configured to control the operation of the refrigerant circuit. The controller includes an evaluation value calculation unit and a refrigerant amount detection unit. The evaluation value calculation unit calculates an evaluation value indicating a capability of a subcooling heat exchanger in accordance with an inlet temperature detected by the inlet temperature sensor and an outlet temperature detected by the outlet temperature sensor. The refrigerant amount detection unit determines whether there is a shortage of refrigerant in accordance with the evaluation value calculated by the evaluation value calculation unit.

Refrigeration device having condenser unit connected to compressor unit with on-site pipe interposed therebetween and remote from the compressor unit

A refrigeration cycle apparatus includes: a low-stage refrigeration cycle including a low-stage compressor, a low-stage condenser, a low-stage pressure reducing device, and a low-stage evaporator, and circulating low-stage refrigerant; a high-stage refrigeration cycle including a high-stage compressor, a high-stage condenser, a high-stage pressure reducing device, and a high-stage evaporator, and circulating high-stage refrigerant; a cascade condenser exchanging heat between the low-stage refrigerant in the low-stage condenser and the high-stage refrigerant in the high-stage evaporator, and a controller. The low-stage refrigerant is a refrigerant that undergoes disproportionation. The low-stage refrigerant is maintained at a pressure lower than a disproportionation pressure at which the low-stage refrigerant undergoes disproportionation.

Refrigeration cycle apparatus and method for controlling refrigeration cycle apparatus

Refrigerating machine

Rack for refrigerating machine

A refrigeration apparatus includes a compressor receiving refrigerant through an injection pipe and of discharging the refrigerant, a condenser, an electronic expansion valve connected by piping to another end of the injection pipe, a subcooling coil, a solenoid valve configured to control inflowing of the refrigerant through the injection pipe into the compressor, an injection bypass pipe connecting the injection pipe and a pipe on a suction side of the compressor, a solenoid valve configured to control passage of the refrigerant flowing through the injection bypass pipe, a high-low pressure bypass pipe connecting a pipe on a discharge side of the compressor and the pipe on the suction side of the compressor, a solenoid valve configured to control passage of the refrigerant through the high-low pressure bypass pipe, and a controller configured to control a frequency of the compressor and opening and closing of each of the solenoid valves.

Refrigeration apparatus and refrigeration cycle apparatus

A refrigerating device that forms a refrigerating cycle in which a plurality of outdoor machinesandprovided at least with compressorsand, condensersand, and accumulatorsandrespectively and an indoor machineprovided with decompressing meansand an evaporatorare connected in parallel by piping, having oil return pipesandthat return refrigerator oil stored in the accumulators into the compressors, an oil equalizing pipethat connects the accumulators to each other, and a controllerthat controls an operation of the compressor and on/off of an electromagnetic valvedeposed on the oil equalizing pipe.

Refrigerating device

Growing community of inventors

Tokyo, Japan

Hiroshi Sata