In order to optimize the design of the submerged combustion vaporizer (SCV)

an experimental apparatus was set up to investigate the heat transfer character outside the tube bundle in SCV. Several experiments were conducted using water and CO

2

as the heat transfer media in the tubes

respectively. The results indicated that hot air flux

the initial liquid level height and the tube pitch ratio had great influence on the heat transfer coefficient outside the tube bundle (h

o

). Finally

the air flux associated factor β and height associated factor γ were introduced to propose a new ho correlation. After verified by experiments using cold water

high pressure CO

2

and liquid N

2

as heat transfer media

respectively

it was found that the biggest deviation between the predicted and the experimental values was less than 25%.