Abstract
Temperature and humidity are important parameters in the operation of proton exchange membrane fuel cell (PEMFC), which have an important impact on the performance of fuel cell. Fuel cell test platform is an important tool to study the performance of fuel cells, and its temperature and humidity control module is also the key in the research process of the test platform, so that it can provide the gas with precise temperature and humidity control during the test process of the fuel cell. In this paper, a humidifier combined with bubbling and spraying is adopted for the application of test platform, and the numerical simulation model of the humidifier is established. According to the model, the influence of operating conditions of humidifier on humidification performance is verified, such as inlet air velocity and the humidifying water temperature. The results indicate that the inlet air velocity and the humidifying water temperature have great influence on the humidifying performance of the humidifier. The humidifying performance decreases with the increase of the inlet air velocity and increases with the increase of the humidifying water temperature respectively. In addition, the humidification performance of the humidifier is verified.
Highlights
At present, there are many kinds of humidification methods for fuel cells, which can be roughly divided into external humidification, internal humidification and self-humidification [1]
When the air flow velocity increase to 15 m·s−1, the water vapor fraction of the outlet gas decreased significantly. This is because the inlet air velocity is too high, which leads to the decrease of the mass transfer rate of water, and leads to the significant decrease of humidification performance of the humidifier
On the basis of the model, the influence of the humidification performance of the humidifier is verified by numerical simulation
Summary
There are many kinds of humidification methods for fuel cells, which can be roughly divided into external humidification, internal humidification and self-humidification [1]. The theory of enthalpy wheel humidification is mass and heat transfer between the dry gas and the gas with a certain temperature and humidity to humidify the dry gas It mainly uses the air exhaust generated by the reaction to humidify the gas. The theory of ultrasonic humidification [13] is similar to that of liquid jet humidification It completes the humidification by contacting the gas with the atomized humidifying water. It is necessary to design a humidifier for the test platform that can fully humidify the gas and to study the factors that affect the humidification performance of the humidifier for the temperature and humidity regulation during fuel cell test. On the basis of existing bubbling humidification, combined with liquid water jet humidification, a humidifier with sufficient humidification capacity was developed for a 10 kW fuel cell test platform. The factors affecting the humidifying performance of the humidifier were studied by this model
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