A NEW METHOD TO DETERMINE THE HEAT-TRANSFER COEFFICIENT OF REFRIGERATED VEHICLES

A new method is proposed for rapid determination of the overall heat t ransfer coefficient K of refrigerated and insulated vehicles. By calcu lating the temperature distribution in the insulation wall using the f inite difference method, the following parameters were obtained: the h eat inertness coefficient and the conversion ratio. A new formula for calculating the K-value is based on these parameters. The principle an d experiments are discussed and analysed in detail in this paper. The results show that the time required by the new method is less than tha t required by other rapid methods, while the precision is much higher. Compared with the steady-state method, the error is within a limit of 5%. This new method is particularly suited to quality control testing of vehicles in production runs.