Intermediate fluid vaporizer(IFV)is an essential component for liquefied natural gas(LNG)floating storage and re-gasification unit(FSRU).Two-phase heat transfer process of propane is widely used in IFVs.To decrease the size of IFVs

the sub-cooled intermediate heat transfer process is used in this paper.Taking propane as the intermediate fluid

the heat exchanging process within the heat exchanger was investigated.Numerical simulation of heat transfer process within sub-cooled IFV heat transfer was carried out to find out the factors which may affect the heat transfer process.The results showed that heat transfer was enhanced by increasing the seawater flow rate;temperature difference of propane and seawater between inlet and outlet increased in seawater inlet temperature.Conclusions were drawn that a larger amount of the seawater flow rate was essential to a higher efficiency of the heat exchanger.Further experiments are needed to make clear the effect of inclination angle on heat transfer enhancement.