To meet the growing thermal management needs of data centers

immersion phase change cooling technology is adopted. This project established a performance model of an immersion phase-change cooling system and simulated the performance of four coolants in this model to confirm the effects of different coolants on its performance. The results showed that: 1) Among the four coolants

D-1 had a stronger overall performance with the widest applicable pressure range and the smallest heat flux required for startup

but the maximum heat dissipation capacity of D-1 was lower than those of FC-72 and HFE-7100. 2) As the flow rate increased

the heat carried by the cooling water tended to a stable value

and different coolants had essentially the same influence on the pressure drop of the cooling water in the tube. 3) Increasing the inlet temperature of the cooling water was beneficial for energy recovery and utilization of the outlet cooling water

but the cooling effect of the system was not good. While reducing the inlet temperature was conducive to improving the cooling capacity

it might cause problems of inefficient utilization of cold energy. 4) In the graphs

under the condition of the same inlet temperature and flow rate of cooling water

the curves of heat carried by the cooling water and temperature rise in the vapor environment of D-1 were close to or basically in line with that of Novec 649

which means that Novec 649 could be substituted by D-1 in the immersion phase change cooling system to exert a better cooling effect.