Bass Definition produces deep, well-defined bass response that doesn’t cloud other frequency ranges.Vocal Clarity reduces echoes, background noises, and reverberations that cause voice signals to be unintelligible.Sound Stage Enhancement elevates and extends the perceived sound to create a broad stereophonic spectrum.Stereo Field Widening creates a full-bodied stereo sound in computers (where the left and right speakers are too close together.).Speaker Protection helps the computer’s small speakers conform to hardware reliability specifications.Dynamic Range Control adjusts volume to compensate for loud cinematic effects that make dialogue and ambient noise too quiet.The fractional fresh air intake (XOA) has small effect on the cabin air temperature but it causes the evaporator coil total thermal load to increase.

Solar absorptivity of the vehicle's exterior surface generally has very small effects on the cabin air temperature and the total coil thermal loads. Increasing the vehicle speed causes the coil total load to increase but its effect on the cabin air temperature is negligible. The screens and windows glass thickness seems to have negligible effects on both the cabin air temperature and coil total thermal load. At any given time, increasing the number of occupants in the passenger cabin causes the cabin air temperature and the coil total thermal load to increase. It was found that increasing the air-conditioning supply air flow rate decreases the cabin air dry bulb temperature while the evaporator coil thermal load steadily increases.

This paper presents results of a parametric study on the effects of volumetric air flow rate, number of occupants, screen and windows glass thickness, vehicle speed, solar absorptivity and the fractional ventilation air intake (XOA) on the cabin air dry bulb temperature and the evaporator coil total thermal load of the air-conditioning system for a 1.6L Proton Wira Aeroback passenger car. Comparison of simulation results with road test data indicates that the mathematical model is capable of predicting the performance of an automotive air-conditioning system with an accuracy of about 95%. A computer program based on a semi-empirical mathematical model for simulating the thermal and energy performance of an automotive air-conditioning system of a passenger car has been developed.

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