The boiling heat transfer was experimentally investigated for the PF-5052 sprays impacting a square heated test surface in a downward direction. Full cone spray nozzles were employed for the spray cooling experiment, and experiments were made under the test conditions of Q=$3.32{ ime}10^{-6}{sim};12.98{ ime}10^{-6}m^3/s$, ${Delta}T_{sub}=5{sim}25^{circ}C$. Also, heat transfer measurements were made using the copper block of $10{ ime}10mm^2$ test area heated by nine cartridge heater. From the experimental results, correlation between the Nusselt number and Reynolds number based on droplet-flow-rate was developed. The correlation shows good predictions with ${pm}30$ % error for PF-5052.