01_Building physics requirement

Building physics are the physical requirements that a building has to face during its entire life.

The sum of all environmental factors that directly or indirectly influence the health and well-being of humans and animals, the development of plants, as well as on the condition of stored goods, production processes, machines, apparatuses and buildings

Thermal comfort is the feeling that expresses well-being with the surrounding climate

• humidity

• temperature

• 
  

• not in the ideal zone

• very humid

• by disconnecting the inside space from the outside space

1. Heat insulation of building envelope

2. Moisture control of building envelope

3. Ventilation

   
   

   (Building envelope as the system boundary)

It is minimizing the energy use, by maximizing building efficiency via passive systems and by using renewable energy.

-> worlds first passive house was built 30 years ago and is in Darmstadt

• conduction

• convection

• radiation

Indication of room temperatures are in Celsius scale [°C]. Temperature differences ("absolute temperature") are in Kelvin [K].

Example: The room temperature is 20°C, the outside temperature -5°C. This results in a temperature difference of 25 K.

• Thermal bridges are caused by a change in thermal conductivity of a component

The U-value indicates how much heat energy is lost through one square meter (m²) of a wall for every one-degree Celsius (or Kelvin) difference in temperature between the inside and outside.

Thermal comfort is the feeling that expresses well-being with the surrounding climate.

Parameter:

• Temperature

• Relative humidity

• Moisture content

• Wind velocity

Mold fouling can already develop at a surface near

• relative humidity of 80%

• At 20 °C and at 50% room humidity a critical temperature of 12,6 °C appears.

GEG = Gebäudeenergiegesetz