Abstract

The paper presents the results of research on humidity in a passenger car cabin equipped with an air cooling system in the summer season in a temperate climate in north-eastern Poland. The choice of the summer season was due to the fact that in temperate climates, the option of air cooling is most often used in the summer period on hot days. Based on the literature, the air quality in the passenger car cabin was assessed in terms of temperature and humidity. The test results were also compared with the results of previous study in which driving a car in summer with air supply without cooling options was investigated. The operation of the cooling system in the car caused a significant decrease in the relative humidity of the air in the car cabin in relation to the relative humidity of the outside air. The average value of relative humidity in the passenger car cabin amounted to between 27.5 % and 49.3 %. The temperature inside the passenger car cabin ranged from 19.7 °C to 33.5 °C and was lower compared to the temperature in the passenger car cabin with the cooling system turned off. The paper presents a model of moisture content in a passenger car cabin as a function of time, number of people, cabin volume and the number of air changes. The presented model based on the moisture balance in the car cabin can be used in algorithms for automatic regulation of car ventilation.

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