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The composition and state parameters of humid air with constant temperature and humidity

by:Sure     2021-08-19
1. The composition of humid air: The layer of air surrounding the earth is called the atmosphere. The thickness of the Earth’s atmosphere measured by Earth’s satellites is about 3000km. The atmosphere is a mixture of dry air and water vapor, called moist air. Dry air is a mixture of nitrogen, oxygen, argon, carbon dioxide, neon, helium and other trace gases. In addition to carbon dioxide in dry air, one is the composition of moist air: the air layer surrounding the earth is called the atmosphere. The thickness of the Earth’s atmosphere measured by Earth’s satellites is about 3000km. The atmosphere is a mixture of dry air and water vapor, called moist air. Dry air is a mixture of nitrogen, oxygen, argon, carbon dioxide, neon, helium and other trace gases. Except for carbon dioxide, the content of other gases in dry air is very stable. The content of carbon dioxide varies greatly with the growth status of animals and plants, meteorological conditions, production emissions and other factors. Since its content is very small, it is allowed to consider dry air as a whole. The content of water vapor (water vapor for short) in moist air is very small. It comes from the evaporation of water on the surface of the ocean, rivers, and lakes, the metabolic processes of various organisms, and the production process. The percentage of water vapor in humid air is unstable, and it often changes with various conditions such as altitude, region, season, climate, and source of humidity. Although the content of water vapor in humid air is very small, it has an effect on the state of humid air. The impact of changes is great. It can cause changes in the degree of dryness and humidity of the wet air, and the physical properties of the wet air will change accordingly, which will have a direct impact on the comfort of the human body, product quality, process and equipment maintenance. 2. Status parameters of humid air: The status of humid air is usually described by pressure, temperature, relative humidity, and moisture content. According to the ideal gas state equation: pvu003dRT......................................... (1) pVu003dmRT........................................ (2) formula Middle p—pressure of gas, Pa; V—specific volume of gas, m3/kg; R—gas constant, depending on the nature of the gas, J/(kg·K); R dry air u003d 287 J/(kg·K ) R water vapor u003d 461 J/(kg·K) V—total volume of gas, m3; T—thermodynamic temperature of gas, K; m—total mass of gas, kg.
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