A test chamber (10) for conditioning air has a test space (12), and a temperature control device (11) for controlling the temperature of the test space and allowing a temperature in a range of 80 C. to +180 C., preferably 100 C. to +200 C., to be established within the test space, the temperature control device having a cooling device (16) with a cooling circuit (17), a heat exchanger (18), a compressor (19), a condenser (20), and an expansion element (21), wherein the refrigerant is a nearly azeotropic and/or zeotropic refrigerant mixture of a mass percentage of carbon dioxide and a mass percentage of at least one of the components ethane, ethene, hexafluoroethane, pentafluoroethane, monofluoro-ethane, 1,1-difluoroethene, fluoromethane and/or propane and/or xenon, the refrigerant having a relative CO2 equivalent of <3000, preferably <500, in particular preferably <10, with respect to 20 years.

The present invention relates to compositions comprising at least one fluoroolefin and an effective amount of stabilizer that may be an epoxide, fluorinated epoxide or oxetane, or a mixture thereof with other stabilizers. The stabilized compositions may be useful in cooling apparatus, such as refrigeration, air-conditioning, chillers, and heat pumps, as well as in applications as foam blowing agents, solvents, aerosol propellants, fire extinguishants, and sterilants.

A heat transfer circuit that includes a main flow path for a working fluid that extends through a compressor, a condenser, an expander, and an evaporator. The working fluid includes CF.sub.3I. The heat transfer circuit also includes an additive stream configured to supply additive for the CF.sub.3I to the working fluid in the main flow path based on a discharge temperature of the compressor. A method for operating a heat transfer circuit that includes directing a working fluid including CF.sub.3I through a main flow path of the heat transfer circuit. The method also includes changing a concentration of additive for the CF.sub.3I based on a discharge temperature of the working fluid from the compressor.

It is provided an ester for a refrigerator oil and of mixed alcohols and mixed monocarboxylic acids. The mixed alcohols include dipentaerythritol and tripentaerythritol in a mass ratio of 90/10 to 99.7/0.3, and the mixed monocarboxylic acids include n-pentanoic acid and 2-methyl butanoic acid in a mass ratio of 50/50 to 80/20. The ester has a kinematic viscosity of 50 to 150 mm.sup.2/s at 40 C.

An air conditioning unit capable of performing a refrigeration cycle using a small-GWP refrigerant is provided. A refrigeration cycle apparatus (1, 1a to 1m) includes a refrigerant circuit (10) including a compressor (21), a condenser (23, 31, 36), a decompressing section (24, 44, 45, 33, 38), and an evaporator (31, 36, 23), and a refrigerant containing at least 1,2-difluoroethylene enclosed in the refrigerant circuit (10).

A method for transferring heat using a heat transfer facility containing a heat transfer composition, said heat transfer composition including a refrigerant, which includes 2,3,3,3-tetrafluoropropene, and a lubricant. The lubricant includes a polyol ester, and the solubility of the 2,3,3,3-tetrafluoropropene in the lubricant at 0 C. and at an absolute pressure of 2.2 bar is less than the solubility of 1,1,1,2-tetrafluoroethane in the lubricant at 0 C. and at an absolute pressure of 2.0 bar. A method including the successive steps of: evaporating a refrigerant; superheating the refrigerant; and compressing the refrigerant.

There is provided a refrigeration cycle apparatus in which good lubricity can be achieved when a refrigeration cycle is performed using a refrigerant having a sufficiently low GWP. The refrigeration cycle apparatus contains a refrigerating oil and a refrigerant composition containing a refrigerant containing trans-1,2-difluoroethylene (HFO-1132(E)), trifluoroethylene (HFO-1123), and 2,3,3,3-tetrafluoro-1-propene (R1234yf).

High power of a compressor that compresses a mixed refrigerant containing at least 1,2-difluoroethylene is achieved. A compressor (100) employs an induction motor (70) as a motor that drives a compression unit (60) that compresses a mixed refrigerant containing at least 1,2-difluoroethylene, and thus, high power is enabled at comparatively low costs.

High efficiency of a compressor that compresses a mixed refrigerant containing at least 1,2-difluoroethylene is achieved. A compressor (100) includes a motor (70) that has a rotor (71) including permanent magnets (712) and thus is suitable for a variable capacity compressor in which the number of rotations of the motor can be changed. In this case, it is possible to change the number of rotations of the motor in accordance with an air conditioning load in an air conditioner (1) that uses a mixed refrigerant containing at least 1,2-difluoroechylene. It is thus possible to enable high efficiency of the compressor (100).

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 (20) constitutes a portion of an air-conditioning apparatus (1), and is connected to an indoor unit (30) via a liquid-side refrigerant connection pipe (6) and a gas-side refrigerant connection pipe (5). The outdoor unit (20) includes an outdoor housing (50), an outdoor heat exchanger (23) disposed inside the outdoor housing (50) and in which a refrigerant flows, a liquid-side shutoff valve (29) connected to the liquid-side refrigerant connection pipe (6), a gas-side shutoff valve (28) connected to the gas-side refrigerant connection pipe (5), and an outdoor electric component unit (8) disposed inside the outdoor housing (50). The refrigerant is a flammable refrigerant containing at least 1,2-difluoroethylene. When the outdoor unit (20) is in its installed state, the lower end of the outdoor electric component unit (8) is positioned above the liquid-side shutoff valve (29) and the gas-side shutoff valve (28).