What is building physics?
Building physics are the physical requirements that a building has to face during its entire life.
What is meant by Human Comfort as a climatic requirement?
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
How is thermal comfort defined by ISO 7730?
Thermal comfort is the feeling that expresses well-being with the surrounding climate
What are three parameters which influence thermal comfort?
humidity
temperature
Comfort parameter according to ASHRAE
(American Society of Heating,
Refrigerating and Air-Conditioning Engineers)
How is Singapores clima matching with the comfort zone?
not in the ideal zone
very humid
How can we improve the thermal comfort?
by disconnecting the inside space from the outside space
Heat insulation of building envelope
Moisture control of building envelope
Ventilation
(Building envelope as the system boundary)
What are the benefits of a passive house / how does it work?
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
What kind of heat transfer does exist in wall insulations? Name the three
conduction
convection
radiation
Difference between temperatur and room temperatur in building physics
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.
What are thermal bridges? In what categories can they be differentiated?
Thermal bridges are caused by a change in thermal conductivity of a component
What are the different types of geometrical thermal bridges?
What is the U-Value?
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.
Exam questions:
What is thermal comfort? Which parameters influence the thermal comfort of humans? Name at least three parameters
Thermal comfort is the feeling that expresses well-being with the surrounding climate.
Parameter:
Temperature
Relative humidity
Moisture content
Wind velocity
In which three ways can heat be transferred?
For which specific physical conditions is there a risk of mould formation?
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.
Energy balance for residential (GEG) and non-residential buildings (DIN V 18599). What are the most important differences?
GEG = Gebäudeenergiegesetz
Zuletzt geändertvor 12 Tagen
