Calculation of absolute humidity using the Assman psychrometer is carried out according to the Springs formula:
K = f – 0.5 (t – t 1 ) • 755
The calculation of absolute humidity when working with the August psychrometer is made according to the formula of Reno:
K = f – Q (t – t1) • B
where K is the desired absolute humidity, g / m 3 ;
f – the maximum voltage of water vapor at the temperature of the wet thermometer is determined by the table (see table. in Appendix 1);
Q – psychrometric coefficient, which is taken equal to 0.00074 for an open atmosphere, and 0.0011 for a room air;
t is the temperature of the dry thermometer; t 1 is the temperature of the wet thermometer; B – barometric pressure at the time of investigation, mm
Hg. Art; 0.5 – constant psychrometric coefficient; 755 – average barometric pressure, mm RT. Art. Calculation of relative humidity : translation of the found ab-
relative humidity in relative is made by the formula:
R = K / F • 100%,
where R is the relative humidity,%; K – absolute humidity, g / m 3 ; F – maximum humidity at dry thermo-
meter . If observation is made in a room where the air
ha is uniform, it is possible to use special tables to facilitate the use, in which the corresponding relative humidity is directly found by the temperature of dry and wet thermometers.
The air medium is only in rare cases at rest, usually the air moves both vertically and horizontally. The latter in atmospheric conditions is called wind, the main characteristics of which are speed (m / s) and direction. To display wind directions in a specific area, a special graph is used – a wind rose. It represents the lines of the points on which the segments corresponding to the number of winds of a certain direction, expressed as a percentage relative to their total number over a certain period of time , are plotted on a certain scale . The absence of wind (calm) is depicted by a circle in the center of the wind rose .
The wind rose is taken into account when determining the rational mutual allocation of industrial and residential (residential) zones, as well as factory workshops with atmospheric emissions and other industries on the territory of an industrial enterprise, when orienting newly constructed medical and preventive institutions, residential and public buildings, landscaping, etc.
The wind rose with the prevailing wind direction of the NEO, depicted in , indicates that when planning a settlement, the organization of an industrial zone to the NEO from the residential area is inexpedient.