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description Journal article public Bulletin of Lviv State University of Life Safety

Efficiency of the Heating System of the Driver's Workplace and the Vessel of the Windshield of Buses

S. Niemyi, V. Brytkovskyi
Published 2021

Abstract

Introduction. One of the dominant areas of improvement of motor vehicles is to improve traffic safety. An im-portant aspect of bus safety is visibility from the driver's workplace, which largely depends on the condition of the wind-shield, especially the absence of fogging and frost, which often occurs at low ambient temperatures.Methodically, this problem is eliminated by blowing the windshield with warm air. Structurally, this is done by devices that, in addition to blowing the windshield, also supply warm air to the driver's workplace. Fogging and icing of the windshield significantly impair the visibility of the road driver, which is a great danger in the movement of the bus. Elimination of icing and fogging of windows provides an increase of visibility and guarantee of safety of driving.An important place is also occupied by the problem of reducing heating systems and blowing operating energy costs, improving the fuel economy of buses.Results. The purpose of the study is to determine the effectiveness of the windshield blowing devices of the bus depending on their design features. As criteria in researches productivity of system blowing, its power consumption and level of noise loading of the driver are accepted.To select a fan with optimal characteristics when used in the device for blowing the windshield of buses and heating the driver's workplace, axial fans were tested. They are using in heating and ventilation systems of buses of different models. It is experimentally established that the fan of the Elko-A200-22 model (Italy) has the best characteris-tics. In the whole range of speed changes, the performance of this fan is much higher compared to other models of the tested fans, which, at the same time, have much higher specific energy consumption. In addition, the fan of this model is characterized by a lower noise level compared to fans of other models with the same outer diameters.Conclusions. Analysis of experimental data shows that the performance of the front heater with two fans and one fan is almost the same. At identical speed modes of operation, the productivity of two fans running in parallel is higher by only 3 ... 16.75%. When measuring the speed of air movement when blowing the windshield, it was found that the speed of blowing does not depend on the number of fans and depends on their performance and the diameter of the air supply hoses to the blowing nozzles.The reason for the lower efficiency of heaters with two fans is that at the outlet after the radiator, in the limited volume of the heater housing, two fans create a much greater aerodynamic drag (back pressure) than one fan.The use of one fan instead of two in the design of bus heaters reduces the electricity consumption of the bus and improves the working conditions of the driver by reducing the noise level at his workplace.

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