Heat transfer fluids and corrosion inhibitor formulations for use thereof

A heat transfer fluid comprising:

• water;
• a freezing point depressant in an amount of about 10 wt. % to about 99.85 wt. % based on a total weight of the heat transfer fluid;
• a non-ionic surfactant in an amount of about 0.001 wt. % to about 2 wt. % based on a total weight of the heat transfer fluid, the non-ionic surfactant comprising (i) an azole compound and (ii) a polyalkylene glycol;
• wherein a conductivity of the heat transfer fluid concentrate is less than or equal to about 50 μS/cm and wherein the heat transfer fluid concentrate is free of siloxane-polyether copolymers.

A method of preventing corrosion in a heat transfer system, the method comprising:

• contacting at least a portion of the heat transfer system with a heat transfer fluid;
• wherein the heat transfer fluid comprises:
• a freezing point depressant;
• water;
• and
• a non-ionic surfactant comprising (i) a corrosion inhibitor for copper and copper alloys and (ii) a polyalkylene glycol;
• wherein a conductivity of the heat transfer fluid is less than or equal to about 100 μS/cm and wherein the heat transfer fluid concentrate is free of siloxane-polyether copolymers.