One of the main concerns of automobile manufacturers is the optimization of cars conceiving. For this reason the integration of clients' perceptions in the manufacturing process is an important aspect of product development. This paper aims to study the perception of young drivers over the elements of discomfort that occur while driving a vehicle. 40 subjects, young drivers (technical university students) participated in the study and were investigated in connection with the main elements of discomfort experienced in the car. Valuation of discomfort was based on descriptions of study participants, descriptions in which they were asked to specify what they perceive as discomfort in the car. On one hand, the results show us a representation of what does discomfort for young drivers mean, and on the other hand, it shows the important role that the thermal factor has in assessing comfort / discomfort in the vehicle.
Air analysis inside vehicles is a problem that can be interpreted from several perspectives. This research is oriented towards the perception of air quality within a car, regarding a situation of cars in stationary traffic. Carbon dioxide measurements were made using a Trotec Data Logger Air Quality CO 2 BZ30 machine inside different standing vehicles with up to five occupants, with and without circulating air. The perception of the air quality was measured on a Likert-type scale with seven levels on a sample group of 60 students. The results highlight, on the one hand, the conditions under which the CO 2 in the cabin air can reach concentrations which are, according to new data, considered to influence the cognitive capacity of occupants in the car, and on the other hand, they present a global assessment of the air quality in the vehicle when critical values of CO 2 have been reached. If the air exchange rates inside a car are low, this degrades the air quality in such a way that it affects the concentration and reactions necessary for safe driving without perceiving any discomfort that would put the drivers or the passengers on alert.
The air cooled heat exchangers are used on a wide range of automotive, construction, industrial or agriculture applications. As the atmospheric air has the lowest convective heat transfer coefficient it is necessary to use different extended surfaces with different geometries. The need for this type of heat exchanger and the relative limited information in the literature, conducted to a study, done at RAAL S.A. Company in collaboration with University “Politehnica” of Timișoara that focuses on finding the optimum length of the straight section depending on the cooler thickness and wavy fin pitch. In the first step we performed analytical investigations on a multiple number of core thickness dimensions, for 5 mm fin pitch. The optimum length of this straight section is considered the section for which the fins that have the highest area goodness factor (J/f). The above numerical study then was to be confirmed in the second step by real life testing. The scope of this study was to determine a relation that shows the influence of the straight fin section on the thermal and hydraulic performances.
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