主权项 |
1. A method for selecting a refrigerant and lubricant combination for a vapor-compression heat transfer system comprising:
a. determining a lower, evaporator discharge operating temperature range of a vapor-compression heat transfer system; b. determining an upper, compressor discharge operating temperature range of the vapor-compression heat transfer system; and c. selecting a refrigerant selected from hydrofluorocarbons (HFCs), hydrofluoroolefis (HFOs), hydrochlorofluorocarbos (HCFCs), hydrochlorofluoroolefins (HCFOs), hydrocarbons (HCs), carbon dioxide, ammonia, dimethyl ether, or mixtures thereof at a first concentration and a lubricant selected from polyalkylene glycols (PAGs), polyol esters (POEs), polyvinyl ethers (PVEs), polyglycols, polyalkylene glycol esters, alkyl benzenes, mineral oils, polyalphaolefins, or mixtures thereof at a second concentration to wherein said refrigerant and said lubricant are miscible at a first temperature within said lower, evaporator discharge operating temperature range and produce a fluid system having a refrigerant-rich phase and a lubricant-rich phase at a second temperature within said upper, compressor discharge operating temperature range provided that said second temperature is higher than said first temperature, wherein the lubricant-rich phase has a higher density than the refrigerant-rich phase at said second temperature and wherein a phase inversion temperature is between the lower, evaporator discharge operating temperature range and the upper, compressor discharge operating temperature range. |