Abstract: The 24 V vehicle air conditioner is a new product that has only appeared in recent years, it is mainly used on Engineering vehicle and trucks. It is usually in the form of backpack on the vehicle like the traditional residential split air conditioner. Vehicle air conditioners are popular among truck drivers, and the market share is getting higher and higher. The reliability appears to be particularly important, especially the reliability related to the electrical safety. At present, rain, temperature rise, and burning are the three most important factors affecting product reliability, but the qualification conditions of the three factors are mutually restrictive. The optimal solution is found successfully through theoretical analysis, software simulation, and experimental testing. The final verification found that the wind field, the position of the electric control, the form of the bracket, and even the sticking position of the sponge will have a certain impact on electrical safety.

Key words: Temperature rise, Rain, Burn, Reliability