IMPROVING THE EFFICIENCY OF AIR CONDITIONING IN THE VEHICLE CABIN

The article presents the research aimed at creating a cooling system in a vehicle cabin that would have the fastest and most effective effect on the operator's body, while being environmentally friendly and cost-effective. It has been found that the efficiency of a vehicle operator's work is affected by the temperature and humidity parameters of the cabin (salon) microclimate. A multi-level approach has been applied to drawing up a heat balance for supplying and removing heat to the driver of a vehicle, taking into account the feasibility of cooling only a local area of his body. An analysis of the results of experiments on the possibility of using ventilation air flow distributors for local volumes with people there is given. It has been found that the operation of existing standard cooling and ventilation systems in a vehicle cabin is associated with significant energy costs, the consumption of a large amount of fuel, and a decrease in its environmental friendliness and efficiency. This is caused by the design complexity of the cooling system, its immobility relative to the operator's body, as a result of which the flow distributed in any direction exits the surface elements of the cabin, is washed out in the total volume, loses the required blowing speed, and, as a consequence, the cooling effect. It is possible to improve the air flow distributor of the vehicle cabin due to the channel having two truncated cones located one in the other, allowing to change the cross-section of the outlet opening and the direction of air flow distribution. The following were obtained: temperature distribution of round jets of the ventilation system of the MTZ-100 tractor at an outside air temperature of tн=29.5 °C without a cooler and with a cooler, a mathematical expression for determining the distance from the distributor. It was found that while maintaining the average heat transfer coefficient at the level of 6.5 W/m2 and the air outlet speed of 1 m/s, the total heat removal increases approximately 2.4 times.