Mitsubishi Electric Corporation

Mitsubishi Electric Corpotation

Kiyoshi Yoshimura

Makoto Saito

Takashi Ikeda

Yohei Kato

Fumitake Unezaki

Masahiko Takagi

Makoto Kurihara

Yasutaka Ochiai

Satoru Yanachi

Atsushi Kono

Kenyu Tanaka

Hirokuni Shiba

Masahiro Kamijo

Ryoji Abe

A refrigeration cycle apparatus includes a discharge temperature sensor that detects a discharge temperature of refrigerant discharged from a compressor, and a controller that controls the opening degree of an expansion valve. The controller computes an amount of variation of the discharge temperature resulting from varying the opening degree of the expansion valve, computes a ratio of the amount of variation of the discharge temperature to an amount of variation of the opening degree of the expansion valve, and determines the opening degree to be set to the expansion valve on the basis of the opening degree of the expansion valve that causes a change of the ratio.

Refrigeration cycle apparatus and control method of refrigeration cycle apparatus

A mode selection unit selects a continuous operation mode when a dehumidifying operation is started. When an indoor temperature is less than or equal to a set first temperature threshold and indoor humidity is greater than a set humidity threshold in the continuous operation mode, the mode selection unit selects an intermittent operation mode. When the indoor temperature is less than or equal to a set second temperature threshold that is greater than the first temperature threshold and the indoor humidity is less than or equal to the set humidity threshold in the intermittent operation mode, the mode selection unit selects an operation stop mode.

Air-conditioning apparatus

The unit attaching device of the present invention has suspension brackets that have a hole for passing a suspension bolt suspended from a ceiling and that are installed to an indoor unit that is a unit to be suspended. The suspension brackets are installed on the ceiling side of the side surface of a housing of the indoor unit. For example, when an earthquake or the like occurs, the distance between a part that is the base point of the swing of the suspension bolt and the installation position of the unit can be reduced.

Unit attaching device and indoor unit

A refrigerating and air-conditioning apparatus suppresses liquid backflow to a compressor with a simple configuration, and reduces annual power consumption. An outdoor unit and an indoor unit are connected to each other by a gas-side connecting pipe and a liquid-side connecting pipe to form a refrigerant circuit in which a compressor, a four-way valve, an indoor heat exchanger, a refrigerant heat exchanger, an expansion valve, an outdoor heat exchanger, and an accumulator are sequentially connected. The refrigerant heat exchanger transfers heat between a high-pressure-side refrigerant flowing between the expansion valve and an outdoor-unit liquid pipe connecting portion and a low-pressure-side refrigerant on an outlet side of the accumulator.

Refrigerating and air-conditioning apparatus

While cooling operation is continued, a compressor is stopped when a detection temperature Tm reaches a control temperature Tc that is a lower temperature than a set temperature Ts only by a bias temperature &#x394;Tb, and rotation of a turbofan is stopped if a human body is not present in a room R, or the rotation of the turbofan is continued and a value of the detection temperature Tm is corrected to a correction detection temperature Ta that is a lower temperature than the detection temperature Tm only by a predetermined temperature correction amount &#x394;Tm. While the correction detection temperature Ta is a temperature that is equal to or lower than the set temperature Ts (the control temperature Tc for prevention of hunting) (Ta=Tm&#x2212;&#x394;Tm&#x2266;Tc), the rotation of the turbofan is continued as long as a person is present in the room R, and thermo ON is resumed if the correction detection temperature Ta exceeds the set temperature Ts (Ta&#x3e;Ts).

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Tokyo, Japan

Kiyoshi Yoshimura