According to the structural characteristics of tent air-conditioner, the inner flow mechanism and influence factors on aerodynamic characteristics of the air duct was investigated by using Fluent commercial CFD code. The disadvantages of original air duct were analyzed, several design options were proposed, internal flow characteristics was analyzed by numerical simulation, the optimal solution of air duct structure was fixed. The numerical results show that the air flow rate of optimal air duct run up to 125 m3/ h, increase by 18.9% compared to the original duct.

Three heat exchangers, all of which have 38 tubes in total and 6 passes, with different tube arrangements were manufactured to be experimental investigated in laboratory. The effect of flat tube distribution on heat transfer performance and pressure drop characteristic was experimental investigated. The effect of different air velocity and flow on heat transfer performance and pressure drop characteristic was also experimental investigated. The results show that similar tube distribution has little effect on heat transfer quality but has great effect on pressure drop. It was found the third arrangement has the best heat transfer and its pressure drop is small. Thus the third arrangement is the best solution. The heat transfer and pressure drop increase with the air velocity and refrigerant flow, so a proper value should be chosen, it was found that the simulation results were mainly agreement with the experimental results.

A novel porous micro heat sink system is presented for thermal management of high power LEDs, which has high heat transport capability. Numerical model for the micro heat sink is developed to describe liquid flow and heat transfer based on the local thermal equilibrium of porous media, and it is solved with SIMPLE algorithm. The numerical results show that the heated surface temperature of porous micro heat sink is low at high heat fluxes and is much less than the bearable temperature level of LED chips. The heat transfer coefficient of heat sink is very high, and increasing the liquid velocity can enhance the average heat transfer coefficient. The overall pressure loss of heat sink system increases with the increasing the inlet velocity, but the overall pressure drop is much less than the pumping pressure provided by micro pump.

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.