Increasing the efficiency of existing refrigeration systems is possible if a new alternative refrigerant can be selected. An ideal refrigerant would be CO2 because it is a natural refrigerant with an extremely high efficiency. In an effort to use CO2 as a refrigerant, ionic liquid lubricants were considered to carry the CO2 and act as the working fluid. The thermal conductivity, viscosity, and pressure-viscosity coefficient were measured for several ionic liquids using a Unitherm Thermal Conductivity Measurement System, a viscometer, and an Elastohydrodynamic Lubrication (EHL) rig, respectively. The ionic liquids tested are 1-butyl-3-methylimidazolium-trifluoromethanesulfonate, tributyl(dodecyl)phosphonium 1,2,3-triazolide and trihexyl(tetradecyl)phosphonium 1,2,3-triazolide. Tests were also performed on paraffin, hexadecane, and dodecane for comparison. Results show that ionic liquids have the potential to be suitable lubricants.
Tribological and Thermal Properties of Ionic LiquidsMaster's Thesis
|Contributor||Tim Ovaert, Committee Member|
|Contributor||Steven Schmid, Committee Chair|
|Contributor||Mihir Sen, Committee Member|
|Degree Level||Master's Thesis|
|Degree Discipline||Aerospace and Mechanical Engineering|
|Departments and Units|