Daikin Industries, Ltd.

Kenji Kinokami

Koji Hayashi

Toshiyuki Momono

Yasutaka Takada

An economizer is provided in a multistage compression refrigeration system including a refrigerant circuit in which a multistage compressor, a condenser, a multistage expansion mechanism, and an evaporator are sequentially connected. The economizer includes: a tank having an introducing portion for introducing a refrigerant of the refrigerant circuit, a liquid outlet for guiding a liquid refrigerant into the evaporator, and a gas outlet for guiding a gas refrigerant into a medium pressure portion of the multistage compressor; and a float expansion valve, which forms part of the multistage expansion mechanism and is attached to the liquid outlet, and whose throttle amount is adjusted according to a level of the liquid refrigerant in the tank. Multiple ones of the liquid outlet and multiple ones of are provided.

Economizer having multiple liquid outlets and multiple float expansion valves

A refrigerator has a discharge three-way valve () for connecting the discharge side of a compressor () to at least either a hot water heat exchanger () or an air heat exchanger () and has a suction three-way valve () for connecting the suction side of the compressor () to at least either the air heat exchanger () or a cold water heat exchanger (). In an operation primarily for cooling, a controller () regulates the opening of the discharge three-way valve () such that a refrigerant with a flow rate higher than a minimum flow rate (Qs) determined based on an outside air temperature flows to the air heat exchanger ().

Freezer apparatus

A refrigerator includes a compressor compressing a refrigerant, a first liquid heat exchanger performing heat exchange between the refrigerant and a first liquid heat medium, an expander expanding the refrigerant, a second liquid heat exchanger performing heat exchange between the refrigerant and a second liquid heat medium, an air heat exchanger performing heat exchange between the refrigerant and air, a blower sending air to the air heat exchanger, a refrigerant flow rate regulator regulating a flow rate of the refrigerant of the first liquid heat exchanger, the second liquid heat exchanger and the air heat exchanger, a pressure sensor detecting a pressure value of the refrigerant of the air heat exchanger, a target pressure value setter setting a target pressure value of the refrigerant of the air heat exchanger in accordance with a target temperature value of the first liquid heat medium, and a blower controller controlling the blower so that the detection value of the pressure sensor becomes the target pressure value.

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Settsu, Japan

Kenji Kinokami