Abstract
The presented article deals with the solution of processes in humid air involving the particular elimination of moisture contained in the air. In the case that all of the moisture in the humid air is in the gaseous state, it is a homogeneous mixture. In the case that a part of the moisture in the humid air is in the state of liquid or solid, it is a heterogeneous mixture. In the presented paper processes, where the partial elimination of moisture from humid air (either as a liquid or as a solid phase) can appear, are studied. They are the processes, where the moist air mixture becomes heterogeneous. Based on the theory of ideal mixtures the computational methods enabling determination of the thermodynamic state of the beginning of the elimination of moisture are developed. The thermodynamic properties of dry air and water are applied. Subsequently there are designed diagrams that can be used as an aid to identify interfaces of homogeneous and heterogeneous humid air.
Highlights
Moist air is a mixture of dry air and moisture
This paper focuses on the theoretical tools to determine the equilibrium conditions on the border of homogeneous and heterogeneous mixtures
For a given value of specific humidity of moist air it is possible to solve the dependence of the pressure of saturated moist air on the temperature from equations (19) and (1) respectively (3), it means the curve at steady p - t diagram at which there occur the elimination of moisture from humid air, see Figure 1
Summary
Moist air is a mixture of dry air and moisture. To simplify the physical description of humid air which occurs in nature or participates in technical processes, it is possible to consider only those of its constituents. If all of the moisture in the humid air is in the state of gas, it is homogeneous mixture. Moist air as the heterogeneous mixture contains moisture - partially in the vapour state and partially in the liquid state, or - partially in the vapour state and partially in the solid state, or - partially as a vapour state, partially in the liquid state and partially in the solid state. A very common problem is the determination of the parameters of the state when moist air as a homogeneous mixture becomes heterogeneous mixtures, i.e. a state in which a moist air begins to secrete moisture. This condition is usually at isobaric conditions, referred to as dew point. This paper focuses on the theoretical tools to determine the equilibrium conditions on the border of homogeneous and heterogeneous mixtures
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