Passage Arrangement and Parameter Match in Multi-stream Heat Exchanger

By analyzing the principle of heat transfer and flow in plate-fin heat exchanger,the calculation formulas of heat transfer and pressure drop are derived.This paper introduces a mathematical model of heat transfer computing in multi-stream heat exchanger,and achieves the design calculation through program.Based on the analysis and comparison of results of previous researches,a principle of passage arrangement and the corresponding calculation method is proposed.A new idea to control the transverse conduction is provided.The periodic passage arrangement improves the temperature profile of separating plates.By taking means to control the amplitude of temperature fluctuation of separating plate,to a certain extent,the temperature profile of separating plates can be close to the constant surface temperature condition and can reduce the transverse heat conduction effectively.A heat exchanger is designed for the experiment,and proved to be rational through professional software.