The present invention provides a working fluid composition for a refrigerating machine, comprising a refrigerating machine oil that comprises an ester of a polyhydric alcohol and a fatty acid, an epoxy compound, and a phosphorus compound, and a fluoropropene refrigerant, wherein the polyhydric alcohol constituting the ester comprises pentaerythritol and dipentaerythritol, the fatty acid constituting the ester comprises at least one selected from fatty acids having 4 to 9 carbon atoms, and the epoxy compound and the phosphorus compound satisfy a condition represented by the following formula (1). $\begin{array}{cc}\left[\mathrm{Formula}1\right]& \\ 0.10\frac{\left(\frac{N_E}{M_E}.Math.W_E\right)}{\left(\frac{N_P}{M_P}.Math.W_P\right)}1.50& \left(1\right)\end{array}$

The present invention provides a working fluid composition for a refrigerating machine, comprising a refrigerating machine oil that comprises an ester of a polyhydric alcohol and a fatty acid, an epoxy compound, and a phosphorus compound, and a fluoropropene refrigerant, wherein the polyhydric alcohol constituting the ester comprises pentaerythritol and dipentaerythritol, the fatty acid constituting the ester comprises at least one selected from fatty acids having 4 to 9 carbon atoms, and the epoxy compound and the phosphorus compound satisfy a condition represented by the following formula (1). $\begin{array}{cc}\left[\mathrm{Formula}1\right]& \\ 0.10\frac{\left(\frac{N_E}{M_E}.Math.W_E\right)}{\left(\frac{N_P}{M_P}.Math.W_P\right)}1.50& \left(1\right)\end{array}$

The present invention provides a refrigerating machine oil comprising: a base oil containing an ester of dipentaerythritol with 2-methylbutanoic acid and n-pentanoic acid; and at least one epoxy compound selected from the group consisting of a glycidyl ester compound and a glycidyl ether compound, the refrigerating machine oil being used with a difluoromethane refrigerant.

The present invention provides a refrigerating machine oil comprising: a base oil containing an ester of dipentaerythritol with 2-methylbutanoic acid and n-pentanoic acid; and at least one epoxy compound selected from the group consisting of a glycidyl ester compound and a glycidyl ether compound, the refrigerating machine oil being used with a difluoromethane refrigerant.

Provided herein is an air conditioner in which the acid scavenger in a refrigeration cycle is maintained over extended time periods of operation to improve reliability. The air conditioner includes a compressor 11 for compressing a refrigerant, an outdoor heat exchanger 13 for causing a heat exchange between the refrigerant and outdoor air, an indoor heat exchanger 31 for causing a heat exchange between the refrigerant and indoor air, and an expansion valve for decompressing the refrigerant. The compressor 11, the outdoor heat exchanger 13, the indoor heat exchanger 31, and the expansion valve are connected to one another with pipes to constitute a refrigeration cycle. The air conditioner uses a refrigerator oil that uses a polyol ester oil as a base oil, and that contains an alkyl glycidyl ether compound having an epoxy group.

Provided herein is an air conditioner in which the acid scavenger in a refrigeration cycle is maintained over extended time periods of operation to improve reliability. The air conditioner includes a compressor 11 for compressing a refrigerant, an outdoor heat exchanger 13 for causing a heat exchange between the refrigerant and outdoor air, an indoor heat exchanger 31 for causing a heat exchange between the refrigerant and indoor air, and an expansion valve for decompressing the refrigerant. The compressor 11, the outdoor heat exchanger 13, the indoor heat exchanger 31, and the expansion valve are connected to one another with pipes to constitute a refrigeration cycle. The air conditioner uses a refrigerator oil that uses a polyol ester oil as a base oil, and that contains an alkyl glycidyl ether compound having an epoxy group.

The present invention provides a working fluid composition for a refrigerating machine, comprising a refrigerating machine oil that comprises an ester of a polyhydric alcohol and a fatty acid, an epoxy compound, and a phosphorus compound, and a fluoropropene refrigerant, wherein the polyhydric alcohol constituting the ester comprises pentaerythritol and dipentaerythritol, the fatty acid constituting the ester comprises at least one selected from fatty acids having 4 to 9 carbon atoms, and the epoxy compound and the phosphorus compound satisfy a condition represented by the following formula (1).

[00001]$\begin{array}{cc}\left[\mathrm{Formula}.Math..Math.1\right].Math.& \\ 0.10\frac{\left(\frac{N_E}{M_E}.Math.W_E\right)}{\left(\frac{N_P}{M_P}.Math.W_P\right)}1.50& \left(1\right)\end{array}$

The present invention provides a working fluid composition for a refrigerating machine, comprising a refrigerating machine oil that comprises an ester of a polyhydric alcohol and a fatty acid, an epoxy compound, and a phosphorus compound, and a fluoropropene refrigerant, wherein the polyhydric alcohol constituting the ester comprises pentaerythritol and dipentaerythritol, the fatty acid constituting the ester comprises at least one selected from fatty acids having 4 to 9 carbon atoms, and the epoxy compound and the phosphorus compound satisfy a condition represented by the following formula (1).

[00001]$\begin{array}{cc}\left[\mathrm{Formula}.Math..Math.1\right].Math.& \\ 0.10\frac{\left(\frac{N_E}{M_E}.Math.W_E\right)}{\left(\frac{N_P}{M_P}.Math.W_P\right)}1.50& \left(1\right)\end{array}$

A lubricant composition including an epoxide compound is disclosed. An additive package including the epoxide compound is also disclosed. The epoxide compound of the lubricant composition acts to improve compatibility of the lubricant composition with a fluoropolymer seal and improve the total base number of the lubricant composition.

A lubricant composition including an epoxide compound is disclosed. An additive package including the epoxide compound is also disclosed. The epoxide compound of the lubricant composition acts to improve compatibility of the lubricant composition with a fluoropolymer seal and improve the total base number of the lubricant composition.