Falling film evaporator(FFE)is a kind of effective

energy-saving evaporating equipment

while the calculation of the heat transfer coefficient is not as accurate as is expected

which is partially due to neglecting the impact of distributor on heat transfer in FFE.For this purpose

a coefficient named Distributor Influence Coefficient is introduced which enable us to get the heat transfer coefficient form a new point of view.It is carried out with a new-type distributor——Umbrella Distributor

and furthermore

the influence of various factors is analyzed

which provides new thoughts for the calculation of heat transfer coefficient in the practical design.