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Numerical Simulation of the Climatic Conditions of Passenger Compartments
Published March 29, 1995 by Associazione Tecnica Dell'Automobile in Italy
The aim of the work presented in this paper was to develop a simulation model capable of predicting the detailed indoor climate of passenger compartments of vehicles like buses, vans, trucks, or commercial vehicles. Based on heat balances the time-dependent temperature distributions of different air regions and body parts (for example roof, side walls, dash board, and seats) are calculated. Similarly, the humidity is computed based on mass balances. Among other things the model takes into account the individual body geometry of a particular vehicle, the solar radiation (which is dependent on vehicle location, date, time of day, and cloud cover), the transmittance properties of the window panes, the heat and humidity release of the passengers, and the influence of the HVAC-system. For high accuracy the generated nodal mesh typically requires of the order of 50 nodes.
The first part of the paper describes the model. The second part of the paper demonstrates the accuracy of the model by comparing the simulation results with experimental data. The last part of the paper contains a series of calculations showing the influence of changes of the body geometry on the compartment climate.