Pressure effects on the pool boiling of the fluorinated ketone C2F5C(O)CF(CF3)2

A low global warming potential dielectric fluid is under investigation for use in two-phase electronic cooling systems. The fluorinated ketone C₂F₅C(O)CF(CF₃)₂, sufficient for either indirect cooling or direct immersion cooling, may be an environmentally friendly alternative for the cooling of power electronics and other high power density devices. This study examines pressure effects on the pool boiling heat transfer coefficient and critical heat flux of the fluorinated ketone. Using a pressurized boiling facility, an aluminum substrate is heated by conduction with a cartridge heater. By measuring the surface temperature and surface heat flux, the nucleate boiling heat transfer coefficient and critical heat flux are obtained for the fluorinated ketone under saturated conditions at various system pressures. Results are compared to the pool boiling of tetrafluoroethane (R-134a) in the same pressurized facility. Data are fitted using the Rohsenow correlation and surface-fluids parameters for R-134a and the fluorinated ketone are determined. Data indicate that the CHF and nucleate boiling heat transfer coefficient of the fluorinated ketone may be increased with only modest increases in the system pressure.