| 摘要 |
PROBLEM TO BE SOLVED: To ensure the lubrication of a compressor with a refrigerating oil in the refrigeration cycle of an air conditioner using an HFC refrigerant. SOLUTION: When R410A being a mixed refrigerant of HFC is used as the refrigerant and when the value of the weight ratio M of the refrigerator oil to the refrigerant is between 1-4, the rate of dilution of a refrigerator oil drastically changes unlike the case where conventional R22 is used. Therefore, even when R410A is used as the refrigerant, the rate of dilution of a refrigerator oil with the refrigerant can be kept within the range of about 10-50% sufficient for the lubricating performances of the compressor by selecting the weight ratio M=1.6-3.5 at which the rate of dilution of a refrigerator oil is 10-50% as an appropriate value. It is also possible to avoid disadvantages such as deterioration in the performances of the refrigeration cycle due to an increase in the delivery occurring when the weight ratio M is excessively large. |
