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EVENT-AREA is a portal of events. Where you can see activities categorized by type, date and venues. EVENT-AREA can even visualize the information on a map.

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Some buildings tend in the summer to a wet basement. This is not uncommon in old houses. In extreme cases this must be drained costly. The app helps you to easily manage the correct air drying.

Often, however, can be generated by targeted airing a dry climate in the basement, which considerably reduces the risk of mold or even condensation. It is important to ventilate only under favorable weather conditions, so as not to increase the moisture in the basement also. Because warm air can hold much more moisture than cold.

A little summery example illustrates the problem: When outside air cools to a temperature of 26 °C and 60% humidity during ventilation at a 20 °C warm basement wall, so the moisture of this air is increased to 86%.

Theoretical background

To calculate the variation of the humidity, recourse is made to the vapor pressure. This is a material and temperature-dependent gas pressure. It is the ambient pressure, below which a fluid passes at a constant temperature in the gaseous state. The saturation vapor pressure of a gas corresponding to the maximum vapor pressure at a given temperature. It is spoken by a saturation. Simply put, this is the pressure of the air at a certain temperature, can be achieved at the 100% relative humidity.

To determine the saturation vapor pressure of a temperature, a data table or the Magnus formula can be used. It is an approximation formula for calculating the saturation vapor pressure in the ideal space. It was erected for the first time in 1844 by Heinrich Gustav Magnus, and since then only supplemented by more accurate values.

It corresponds to) the saturation vapor pressure (in Pascal) of the temperature T (in degrees Celsius).

To print E0 and determine the vectors A and B, must be considered whether the condensation on a flat water or ice surface takes place.

  flat water surface flat ice surface
Applicable temperature range -30 °C <= t <= 70 °C -60 °C <= t <= 0 °C
initial pressure E0 611,213 Pa 611,153 Pa
Factor A 7,602 9,747
Factor B 241,2 272,186

As an example, has a temperature of 26 °C, a saturation vapor pressure of 3356.67 Pascal.

The app displays the humidity, which is produced during heating of the initial values. To determine this, the saturated vapor pressure has been used as an aid. Because this can allow the target values are equated in relation to the relative humidity of the output values.

After changing, are obtained from the temperatures and the humidity output, the target humidity.