With the advantages of excellent heat transfer performance and less refrigerant charge

falling film evaporator has been widely used in seawater desalination and other industries. However

due to the practical problems of liquid level control and dry patches interactions

the structure design of falling film evaporator should be optimized for refrigeration applications. To resolve those problems

a simulation model for water-to-water falling film evaporator was conducted in this paper. Through the finite volume method

the temperature distribution along the working tubes and the heat exchanger has been obtained. For an existed falling film evaporator with 4-pass working tubes under boiling temperature of 80℃ and spraying mass of 0.4 kg·s-1

it is suggested that 2-pass working tubes should be in falling film region in order to arrive the largest heating capacity. The distribution of heat transfer coefficient along the tube is also investigated. Finally

it is proposed that there exits an optimal boundary line between full liquid and falling film region. It may provide a new idea for optimal design of falling film evaporators.