This content is not included in your SAE MOBILUS subscription, or you are not logged in.
Development of Cooling Fan Model and Heat Exchange Model of Condenser to Predict the Cooling and the Heat Resistance Performance of Vehicle
ISSN: 0148-7191, e-ISSN: 2688-3627
To be published on April 14, 2020 by SAE International in United States
The cooling performance and the heat resistance performance of commercial vehicle are balanced with aerodynamic performance, output power of power train, styling, the location of sensors, cost and many other parameters. Therefore, it is desired to predict the cooling performance and the heat resistance performance with high accuracy at the early stage of development. Three forms of heat transfer consist of conduction, convection and radiation. Among of these components, it is sometimes difficult to solve the thermal conduction accurately, because to prepare accurate shape and properties needs lots of time and efforts at the early stage of development. Therefore, the cooling performance of heat exchangers and the air temperature distribution in the engine compartment are predicted to access the cooling and the heat resistance performance of vehicle at the preliminary design stage. The air temperature distribution is dominated by the distribution of heat radiation on heat exchangers, the flow distribution which is produced by fans and thermal convection at the surface of parts in the engine compartment. For the case of middle or high vehicle speed, the first two components have larger effects on the air temperature distribution. To predict these one with high accuracy, the fan model and condenser model are developed. The fan model provides the accurate PQ performance, which is based on a spec values, and the flow distribution which is based on the results of sliding mesh method at the exit of fan module with low computational cost. The heat radiation on condenser is concentrated around the inlet hose of core. To reproduce this distribution, the states of phase of coolant are solved in the condenser model. The accuracy of these models are confirmed by using components models and vehicle calculations.