Numerical Simulation of Indirect Evaporation Cooler Based on Discrete Multi-phase Flow
The existing indirect evaporation cooler physical model only considers the evaporation of water film and it is not suitable to apply in conditions with high velocity and high air volume,such as data centers.A new numerical model based on discrete multi-phase flow that considers the evaporation of both water film and water drop was proposed.Using this model,the thermal performance of an indirect evaporation cooler in high-velocity condition was studied.The results of simulations indicate that this model has higher precision in both high velocity and low velocity with a maximum error of 3.36％.The wet bulb efficiency and coefficient of performance of indirect evaporation cooler are largely dependent on air velocity,flow ratio,and heat conductivity coefficient of heat mass exchanger,and less dependent on the inner-surface wetting factor of the core wet channel.It is recommended that the air velocity of secondary air should be 5～6 m/s,the flow ratio be 1.1,the heat conductivity coefficient of heat mass exchanger be higher than 10 W/(m·K)and the wetting factor of the wet channel be 0.8.
indirect evaporation coolingdiscrete multi-phase flowbreakup of dropdata centernumerical simulation
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