Abstract
Proton exchange membrane fuel cell (PEMFC) generates electricity through hydrogen and oxygen chemical reaction with the generation of much heat. According to the working temperature of PEMFC, the thermal resistance and internal relative pressure change of the flat-plate micro closed-loop pulsating heat pipe (CLPHP) are tested and analyzed at different filling ratios, vacuum degrees, and inclination angles, whose working medium is binary methanol-deionized water with a mass ratio of 5:1. The experiment results show that the higher the vacuum degree is, the better the startup and heat transfer performance of CLPHP become; the thermal resistance is less sensitive to inclination angle except for horizontal placement; the 40% volume-filling ratio can effectively avoid dry-out at high temperature. When 80 °C is the ideal working temperature of PEMFC, the thermal resistance of CLPHP is 0.093°C/W; the heat transfer heat flux is 1.59 W/cm2, and the temperature fluctuation is small. Therefore, flat-plate CLPHP has great application potential for PEMFC cooling.
Highlights
IntroductionThe hydrogen Proton exchange membrane fuel cell (PEMFC), which generates electric energy by the chemical reaction of hydrogen and oxygen, has been developed rapidly in recent years
Hydrogen is one of the cleanest energy sources
The results showed that when gravity inhibits the flow of working fluid, the temperature distribution is uniform, the thermal resistance increases
Summary
The hydrogen PEMFC, which generates electric energy by the chemical reaction of hydrogen and oxygen, has been developed rapidly in recent years. As the PEMFC has the advantages of low operating temperature, high efficiency, high power density, and zero emission, its development has been strongly supported by the government and is likely to become the mainstream type of future energy structure [1]. PEMFCs have been applied in automobiles [2], power generation [3], military [4], and other fields. High heat production is one of the bottlenecks affecting the rapid development of PEMFC. The heat production power of PEMFC is about 50%. Rapid and uniform cooling is essential to the efficient and stable operation of PEMFC
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