| Hydrogen Fuel Cells,which are also called Proton Exchange Membrane Fuel Cells(PEMFC),are widely used in electric vehicle charging stations,vehicles and other power generation facilities because of their high efficiencies,zero emissions and zero pollution.However,hydrogen fuel cells emit 3-5 times more heat during operation than traditional fuel vehicles.Traditional air cooled and liquid cooled heat dissipation systems have problems such as low heat dissipation efficiency,poor heat dissipation efficiency at high temperatures,and large volume of heat dissipation systems.Therefore,it is imperative to develop efficient heat exchange equipment suitable for hydrogen fuel cells.In view of the current status of hydrogen fuel cell heat dissipation,an experimental test device was designed and built to simulate the heat dissipation system of hydrogen fuel cell,using glycol aqueous solution and HFE-7100 phase change work medium as the system circulation medium respectively,and the heat dissipation performance of parallel flow heat exchanger with four different flow path layouts was experimentally studied,and the conclusions are as follows:(1)Through the experimental study of glycol aqueous solution as the system circulation medium,the results show that the comprehensive heat dissipation performance of the parallel flow heat exchanger with a 4-flow symmetrical flow path layout is relatively better,and can meet the system design heat dissipation requirements below 37℃ ambient temperature.(2)Under the same working conditions,through the experimental study of HFE-7100 phase change medium as the system circulation medium,the results show that: the comprehensive heat dissipation performance of the parallel flow heat exchanger with 3-flow asymmetric flow channel layout is relatively better,and can meet the system design heat dissipation requirements below 50℃ ambient temperature.(3)The comparative analysis of the heat dissipation performance of the two system circulating media shows that: when the ambient temperature is lower than 37℃,both system circulating media can meet the system heat dissipation requirements,but the heat dissipation per unit pressure drop of the glycol aqueous solution heat dissipation system is significantly better than that of the HFE-7100 phase change workpiece heat dissipation system;When the ambient temperature is higher than 37℃,the glycol aqueous heat sink system can no longer meet the heat dissipation requirement of the system,but the HFE-7100 phase change mass heat sink system not only meets the heat dissipation requirement,but also has a better heat dissipation per unit pressure drop than the glycol aqueous heat sink system.The HFE-7100 not only meets the heat dissipation requirement,but also has better heat dissipation per unit pressure drop than aqueous glycol solution. |
