Abstract
At temperatures below 0°C or above 200°C, heat-transfer media other than water often are the more optimum choice. Glycol/water, typically ethylene glycol or propylene glycol solutions, are widely used for liquid-phase secondary cooling and heating applications. Using appropriate inhibitors, the glycol-based fluids can be used over a temperature range of –50 to 175°C. Glycol/water solutions intended for heat-transfer systems are manufactured by Union Carbide Corp. and Dow Chemical.
Keywords: Heat transfer; High level media; Glycols; Vapor phase operations; Liquid phase operations; Petroleum oils; Synthetic fluids; Gases; Liquid metals; Low level media; Refrigerants; Heat pumps; Coolants; Thermal engine cycles