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The virtual prototype model of air-conditioner piping system is set up based on ANSYS software, modal analysis and harmonic analysis is carried out on the model before and after modification. Some optimization is carried out based on the simulation and analysis results, comparing the two models before and after modification, simulation and the experimental results agree very well. It shows that the cost could be reduced and mechanical property is also good after optimization.

It is essential to investigate the vibration properties of piping system in air conditioner. Finite Element Method is used to build the virtual prototype model of the air conditioner, and the dynamic responding analysis was conducted using ANSYS software. The modal analysis and harmonic response analysis was conducted for different modals and the results was compared. The simulation results showed that the vibration characteristics of modified model is better than that of the original model, thus resonance phenomenon could be avoided.

Dealing with a droplet on the flow channel of PEMFC, a mathematical model based on the force balance of the flow force, gravity and hysteresis tension is derived to address the expressions of the critical airflow velocity and the droplet radii. The results show that in the horizontal flow channel, the critical airflow velocity is hardly affected by the working temperature but decreasing with the increasing of operation pressure. The droplet removal capability can be enhance by increasing the tilt angle of the cell. For a small droplet, the operation pressure has an apparent effect on the airflow velocity, while for a droplet in the spontaneous departure area, this effect can be neglected.