The purpose is to determine climatic conditions in a vehicle in various weather and other conditions. Besides the absolute values we are interested also in spatial gradients of temperature and relative humidity. In this respect we arranged in a vehicle a measuring system comprised of 9 thermometers and 5 combined sensors for temperature and relative humidity. With one thermometer and one combined sensor the outside temperature and relative humidity was measured. We performed measurements in mainly cloudy weather, in clear weather with 2 cm opened windows and closed windows, and in clear weather with air-condition switched on after warming and used different fan speeds as well as applied internal air circulation. Measurements revealed interesting results. For example, in cloudy weather the temperature rise is usually less than 15 deg C, while the relative humidity drop is less than 20 %. If a vehicle is exposed to the sun for a few minutes, the temperature quickly rises for 10 deg C, while the relative humidity falls for 10 %. If a vehicle is exposed to the sun, a human being is practically unable to detect the difference in temperature, when the rear windows are open for 2 cm or closed. More important is that a vehicle is ventilated by means of open doors for at least 10 minutes before a ride. Air-condition is the most welcome in a vehicle during the hot weather. While in operation, besides cooling of the internal air, also gradients are smaller. On the other hand a low relative humidity is even lower, which accelerates dehydration of passengers. Measurements showed that the medium fan speed of air-conditioning is optimal. A slightly better cooling performance is achieved, if an inlet for external fresh air is closed. The colour of a vehicle as well as of interior parts is important, because they absorb the short wavelengths of the visible light and radiate it back to the interior as long wavelength of infrared light, which is then trapped by the window. In this respect the measurements in three vehicles of the same type but different colours will be performed simultaneously under the same weather conditions.
Measuring of climatic conditions in a vehicle
Messung der klimatischen Verhältnisse in einem Fahrzeug
2003
4 Seiten, 5 Bilder
Aufsatz (Konferenz)
Englisch
Europäisches Patentamt | 2019
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