Lexikon L
- Air tightness
With the "EnEV" it became a basic part of construction work and is defined in "DIN V4108-7" (state regulation). In this, the standards for air tightness of buildings to avoid unnecessary loss of energy were made stricter. Unfortunately, in recent years, damage occurred in houses constructed under these standards. This, however, comes from false execution of orders or wrong behavior in usage. Air tightness prevents the penetration of air from the inside to the outer components and the danger of dew (steam brake). Air tightness is measured with the blower door method.
- Humidity
It is the magnitude of water steam in the air.
It is greatly dependent on the temperature. It is between 0% and 4% volume to the saturation of the air. Humidity is indicated as absolute in gram of steam per cubic meter at g/m³ and as relative, which indicates the proportion of absolute humidity to the maximal humidity for the actual temperature with saturation in per cent. Too high humidity is the cause for unhealthy climate in the building and damage in construction.
- Ventilation plant
The variety of equipment of a mechanically operated ventilation plant reaches from a simple fan to the waste air ventilation up to highly complex heat systems with warmth pumps supporting warmth recovery, pollum filters and humidity-regulating additional devices the goal of all these is to provide a nice and healthy room climate and to minimize ventilation warmth losses. Furthermore, a ventilation plant ensures the sufficient ventilation of the building and prevents dangers from the necessary air tightness.
- Ventilation warmth loss
It is a loss from the ventilation of rooms. There may be great differences by the way of the ventilation. Opening the window constantly half-way may lead to a lower room temperature and of the components, and dew-opening up the window all the way once in a while leads to a quick change of air without out cooling components and room interior. Controlled ventilation by plants avoids such problems and can be connected with warmth recovery systems to minimize the ventilation warmth losses.
