Daikin Industries, Ltd.

Yuuki Yotsumoto

Mitsushi Itano

Shun Ohkubo

Daisuke Karube

Kazuhiro Takahashi

Yuzo Komatsu

Tatsuya Takakuwa

Akihito Mizuno

Tomoyuki Gotou

Eiji Kumakura

Yasufu Yamada

Atsushi Yoshimi

Takuro Yamada

Ikuhiro Iwata

Tetsushi Tsuda

Takeo Abe

Yumi Toda

Tatsumi Tsuchiya

Masaru Tanaka

Hitomi Kuroki

Kenji Gobou

Ikumi Tomotsuka

Yuuichi Yanagi

Keisuke Ohtsuka

Atsushi Okamoto

Yoshinari Asano

Kazuhiro Furusho

Keiji Aota

Takashi Usui

Masanori Ukibune

Yoshikazu Nakao

Shinichi Fujinaka

In an air conditioner that uses a refrigerant mixture containing at least 1,2-difluoroethylene, high efficiency is achieved. In the air conditioner (), a compressor () can be driven without interposing a power conversion device between an AC power source () and a motor (). Thus, it is possible to provide the air conditioner () that is environmentally friendly and has a relatively inexpensive configuration.

Air conditioner

The propagation of a disproportionation reaction of a refrigerant is suppressed. Disclosed is a method that uses a composition in a device, in which the composition includes one or more compounds selected from the group of ethylene-based fluoroolefins, 2,3,3,3-tetrafluoropropene, and 1,3,3,3-tetrafluoropropene, and the heat capacity of a portion with a melting point greater than or equal to 1,000° C. in the device is greater than or equal to 6.5 J/K.

Use of composition in device, device, and refrigeration cycle apparatus

A warm-water generating apparatus () uses, as a refrigerant, a mixed refrigerant containing at least 1,2-difluoroethylene (HFO-1132(E)). The warm-water generating apparatus () includes a compressor (), a heat-source-side air heat exchanger (), an expansion valve (), and a use-side water heat exchanger (). The water heat exchanger () causes the mixed refrigerant flowing therein and first water to exchange heat with each other to heat the first water.

Warm-water generating apparatus

The present disclosure provides a composition comprising a refrigerant characterized by having a coefficient of performance (COP) and a refrigerating capacity equivalent to or higher than those of R404A, and having a sufficiently low GWP. Specifically, the present disclosure provides a composition comprising a refrigerant, the refrigerant comprising trans-1,2-difluoroethylene (HFO-1132 (E)) and 2,3,3,3-tetrafluoropropene (HFO-1234yf), wherein HFO-1132 (E) is present in an amount of 35.0 to 65.0 mass %, and HFO-1234yf is present in an amount of 65.0 to 35.0 mass %, based on the total mass of HFO-1132 (E) and HFO-1234yf, and wherein the refrigerant is for use in operating a refrigeration cycle in which the evaporation temperature is −75 to −5° C.

Composition containing refrigerant, and refrigeration method using said composition, operating method for refrigeration device, and refrigeration device

Provided is a heat transfer composition comprising at least one iodocarbon compound and a refrigeration oil, and having a turbidity of 100 degrees or less as measured in accordance with JIS K0101 after stability testing. Also provided is a heat transfer composition comprising at least one iodocarbon compound and a refrigeration oil in which no hydrogen atom is bonded to a carbon atom or silicon atom in a main chain skeleton. These heat transfer compositions have significantly improved stability and are prevented from discoloration due to deterioration over time.

Heat transfer composition

No studies have been made regarding what kinds of refrigerants should be used in a refrigeration cycle device for a vehicle. An air conditioner () for a vehicle includes a refrigerant circuit () and a refrigerant that is sealed in the refrigerant circuit (). The refrigerant circuit () includes a compressor (), a first heat exchanger (), which serves as a heat dissipater in a dehumidifying heating mode, an outside-air heat exchanger (), a cooling control valve (), and a second heat exchanger (), which serves as an evaporator in the dehumidifying heating mode. The refrigerant is a refrigerant having a low GWP.

Refrigeration cycle device for vehicle

A showcase includes a refrigerant circuit and a refrigerant enclosed in the refrigerant circuit. The refrigerant circuit includes a compressor (), a radiator (), an expansion valve (), and an evaporator (). The refrigerant is a low-GWP refrigerant.

Refrigerant cycle apparatus

A two-stage refrigeration apparatus () includes a first cycle () and a second cycle (). The first cycle () includes a first compressor (), a first condenser (), a first expansion mechanism (), and a first evaporator () that are arranged in such a manner as to be connected to the first cycle. A first refrigerant circulates through the first cycle. The second cycle () includes a second downstream-side condenser () and a second evaporator () that are arranged in such a manner as to be connected to the second cycle. A second refrigerant circulates through the second cycle. The first evaporator () and the second downstream-side condenser () constitute a cascade condenser (). In the cascade condenser (), heat is exchanged between the first refrigerant and the second refrigerant. At least one of the first refrigerant and the second refrigerant is a refrigerant mixture containing at least 1,2-difluoroethylene (HFO-1132(E)).

Refrigeration apparatus

The present disclosure provides a composition comprising a refrigerant characterized by having a coefficient of performance (COP) and a refrigerating capacity equivalent to or higher than those of R404A, and having a sufficiently low GWP. Specifically, the present disclosure provides a composition comprising a refrigerant, the refrigerant comprising trans-1,2-difluoroethylene (HFO-1132 (E)) and 2,3,3,3-tetrafluoropropene (HFO-1234yf), wherein HFO-1132 (E) is present in an amount of 35.0 to 65.0 mass %, and HFO-1234yf is present in an amount of 65.0 to 35.0 mass %, based on the total mass of HFO-1132 (E) and HFO-1234yf, and wherein the refrigerant is for use in operating a refrigeration cycle in which the evaporation temperature is &#x2212;75 to &#x2212;5&#xb0; C.

The present disclosure provides a composition comprising a refrigerant that has characteristics of having a coefficient of performance (COP) and a refrigerating capacity equivalent to or higher than those of R404A, and having a sufficiently low GWP. More specifically, the present disclosure provides a composition comprising a refrigerant, the refrigerant comprising trans-1,2-difluoroethylene (HFO-1132(E)), difluoromethane (HFC-32), and 2,3,3,3-tetrafluoropropene (HFO-1234yf), wherein the total concentration of the three components is 99.5% by mass or more, based on the entire refrigerant, and three components have a mass ratio that falls within a region surrounded by a figure passing through the following 4 points in a ternary composition diagram whose three vertices represent the three components:

Composition containing refrigerant, refrigeration method using said composition, method for operating refrigeration device, and refrigeration device

The present disclosure is to provide a composition comprising a refrigerant that has the characteristics of having a sufficiently low GWP, and having a coefficient of performance (COP) and a refrigerating capacity equivalent to or higher than those of R404A. The present disclosure provides a composition comprising a refrigerant, the refrigerant comprising trans-1,2-difluoroethylene (HFO-1132(E)), 1,1,2-trifluoroethylene (HFO-1123), and 2,3,3,3-tetrafluoropropene (HFO-1234yf), wherein the total concentration of the three components is 99.5 mass % or more, based on the entire refrigerant, and the three components have a mass ratio that falls within a region surrounded by a figure passing through the following 5 points in a ternary composition diagram whose three vertices represent the three components:

Refrigerant-containing composition, and refrigerating method, refrigerating device operating method, and refrigerating device using said composition

The present disclosure provides a composition comprising a refrigerant characterized by having a coefficient of performance (COP) and a refrigerating capacity (Capacity) equivalent to or higher than those of R134a, and having a sufficiently low GWP. The present disclosure is, specifically, a composition comprising a refrigerant, the refrigerant comprising cis-1,2-difluoroethylene (HFO-1132(Z)) and 2,3,3,3-tetrafluoropropene (HFO-1234yf), wherein HFO-1132(Z) is present in an amount of 53.0 to 59.5 mass %, and HFO-1234yf is present in an amount of 47.0 to 40.5 mass %, based on the total mass of IFO-1132(Z) and HFO-1234yf.

A refrigeration cycle apparatus () includes a refrigerant circuit () including a compressor (), a heat source-side heat exchanger (), an expansion mechanism (), and a usage-side heat exchanger (). In the refrigerant circuit (), a refrigerant containing at least 1,2-difluoroethylene (HFO-1132 (E)) is sealed. At least during a predetermined operation, in at least one of the heat source-side heat exchanger () and the usage-side heat exchanger (), a flow of the refrigerant and a flow of a heating medium that exchanges heating with the refrigerant are counter flows.

Refrigeration cycle apparatus

An object is to provide a mixed refrigerant having three types of performance, i.e., a refrigerating capacity that is equivalent to that of R410A, a sufficiently low GWP, and a lower flammability (Class 2L) according to the ASHRAE standard. Provided is a composition comprising a refrigerant, the refrigerant comprising trans-1,2-difluoroethylene (HFO-1132(E)), difluoromethane (R32), and 2,3,3,3-tetrafluoro-1-propene (R1234yf), wherein when the mass % of HFO-1132(E), R32, and R1234yf based on their sum in the refrigerant is respectively represented by x, y, and z, coordinates (x,y,z) in a ternary composition diagram in which the sum of HFO-1132(E), R32, and R1234yf is 100 mass % are within the range of a figure surrounded by line segments AC, CF, FD, and DA that connect the following 4 points: point A (71.1, 0.0, 28.9), point C (36.5, 18.2, 45.3), point F (47.6, 18.3, 34.1), and point D (72.0, 0.0, 28.0), or on these line segments; the line segment AC is represented by coordinates (0.0181y&#x2212;2.2288y+71.096, y, &#x2212;0.0181y+1.2288y+28.904); the line segment FD is represented by coordinates (0.02y&#x2212;1.7y+72, y, &#x2212;0.02y+0.7y+28); and the line segments CF and DA are straight lines.

Composition containing refrigerant, use of said composition, refrigerator having said composition, and method for operating said refrigerator

A heat exchange unit is provided with which, even if a flammable refrigerant is used, the likelihood of the refrigerant reaching an electric component unit is reduced. An outdoor unit () constitutes a portion of an air-conditioning apparatus (), and is connected to an indoor unit () via a liquid-side refrigerant connection pipe () and a gas-side refrigerant connection pipe (). The outdoor unit () includes an outdoor housing (), an outdoor heat exchanger () disposed inside the outdoor housing () and in which a refrigerant flows, a liquid-side shutoff valve () connected to the liquid-side refrigerant connection pipe (), a gas-side shutoff valve () connected to the gas-side refrigerant connection pipe (), and an outdoor electric component unit () disposed inside the outdoor housing (). The refrigerant is a flammable refrigerant containing at least 1,2-difluoroethylene. When the outdoor unit () is in its installed state, the lower end of the outdoor electric component unit () is positioned above the liquid-side shutoff valve () and the gas-side shutoff valve ().

Growing community of inventors

Osaka, Japan

Yuuki Yotsumoto