This paper presents the effect of internal sintered porous tube on the falling-film evaporation heat transfer coefficients. The experiment was performed with a single-tube evaporator

using steam in the shell to heat water in the tube. The falling-film evaporation heat transfer coefficients were calculated under various conditions with heat flux from 13 kW·m-2 to 90 kW·m-2

heat transfer temperature difference from 2.87℃ to 9.5℃

and liquid Reynolds number from 4500 to 15000. The experimental results with a smooth tube are compared to those with an internal sintered porous tube. The results show that the falling-film evaporation heat transfer coefficients of an internal sintered porous tube are 2.03 times that of smooth tube

while the overall heat transfer coefficients are 1.78 times. The enhancement effects for heat transfer of internal sintered porous tube are obvious.