Daikin Industries, Ltd.

Ryusuke Fujiyoshi

Eiji Kumakura

Kazuhiro Furusho

Hiromune Matsuoka

Ikuhiro Iwata

Tomohiro Yabu

Atsushi Yoshimi

Shun Yoshioka

Yoshio Ueno

Shuji Fujimoto

Toshiyuki Kurihara

At a refrigeration cycle device, an injection pipe and an economizer heat exchanger are provided at a main refrigerant circuit. In addition, the refrigeration cycle device includes a sub-refrigerant circuit having a sub-usage-side heat exchanger. At the refrigeration cycle device, the sub-usage-side heat exchanger functions as an evaporator of a sub-refrigerant and cools a main refrigerant that has been cooled at the economizer heat exchanger, or functions as a radiator of the sub-refrigerant and heats the main refrigerant that has been cooled at the economizer heat exchanger.

Refrigeration cycle device

Even if, in decompressing a refrigerant by an expansion mechanism, the temperature of the refrigerant cannot be sufficiently reduced, in order to increase the evaporation capacity of a use-side heat exchanger, a main expansion mechanism including an expansion element of a rotary or scroll type that causes power to be produced by decompressing a main refrigerant is provided at a main refrigerant circuit in which the main refrigerant circulates. Further, a sub-refrigerant circuit that differs from the main refrigerant circuit and in which a sub-refrigerant circulates is provided. A sub-use-side heat exchanger that is provided at the sub-refrigerant circuit and that functions as an evaporator of the sub-refrigerant is caused to function as a heat exchanger that cools the main refrigerant that flows between the main expansion mechanism and a main use-side heat exchanger.

A refrigeration cycle device that includes a main refrigerant circuit and a sub-refrigerant circuit cools or heats a main refrigerant that flows between a main heat-source-side heat exchanger and a main usage-side heat exchanger by causing a sub-usage-side heat exchanger to function as an evaporator or a radiator of a sub-refrigerant. A first main expansion mechanism and a second main expansion mechanism that decompress the main refrigerant are provided on an upstream side and a downstream side of the sub-usage-side heat exchanger of the main refrigerant circuit.

A suction injection pipe and a subcooling heat exchanger are provided at a main refrigerant circuit in which a main refrigerant circulates. Further, a sub-refrigerant circuit that differs from the main refrigerant circuit and in which a sub-refrigerant circulates is provided. A controller performs control for switching between a cooling action of the subcooling heat-exchanger that cools the main refrigerant that is sent to a main use-side heat exchanger by using the suction injection pipe and the subcooling heat exchanger, and a cooling action of the sub-refrigerant-circuit that cools the main refrigerant that is sent to the main use-side heat exchanger by using the sub-refrigerant circuit.

An air-conditioning apparatus uses carbon dioxide as a refrigerant, and includes a two-stage-compression-type compression mechanism, a heat source-side heat exchanger, an expansion mechanism, a usage-side heat exchanger, and an intercooler. The intercooler uses air as a heat source. The intercooler is configured and arranged to cool refrigerant flowing through an intermediate refrigerant tube that draws refrigerant discharged from the first-stage compression element into the second-stage compression element. The intercooler is integrated with the heat source-side heat exchanger to form an integrated heat exchanger, with the intercooler disposed in an upper part of the integrated heat exchanger.

Refrigeration apparatus

An air conditioning system includes a plurality of latent heat utilization side refrigerant circuits which are connected in parallel with one another, and a plurality of sensible heat utilization side refrigerant circuits which are connected in parallel with one another. The latent heat utilization side refrigerant circuits include adsorbent heat exchangers provided with an adsorbent on the surface of each. The sensible heat utilization side refrigerant circuits respectively include air heat exchangers and are capable of exchanging heat between the refrigerant and air.

Air conditioning system

An air conditioning system to treat a latent heat load and a sensible heat load in a room includes a plurality of utilization units, a heat source unit, and connection pipes that connect between the units. The utilization units include adsorbent heat exchangers provided with an adsorbent on the surface of each. The utilization units are configured to alternate between an adsorption process and a regeneration process. The heat source unit includes a compression mechanism and an accumulator.

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Sakai, Japan

Ryusuke Fujiyoshi