basics:building_physics_-_basics:thermal_bridges:tbcalculation:ground_contact:procedure
Differences
This shows you the differences between two versions of the page.
Both sides previous revisionPrevious revisionNext revision | Previous revision | ||
basics:building_physics_-_basics:thermal_bridges:tbcalculation:ground_contact:procedure [2016/08/09 14:25] – mschueren | basics:building_physics_-_basics:thermal_bridges:tbcalculation:ground_contact:procedure [2019/02/21 10:20] (current) – cblagojevic | ||
---|---|---|---|
Line 1: | Line 1: | ||
====== Recommended procedure for calculating thermal bridges of components in contact with the ground ====== | ====== Recommended procedure for calculating thermal bridges of components in contact with the ground ====== | ||
- | |||
- | to be translated and corrected | ||
In practice, very different methods are often used for calculating thermal bridges of components in contact with the ground (thermal bridges towards the ground). | In practice, very different methods are often used for calculating thermal bridges of components in contact with the ground (thermal bridges towards the ground). | ||
The ground especially is taken into account in the calculation in different ways: | The ground especially is taken into account in the calculation in different ways: | ||
- | * taking into account | + | * taking into account the ground as a material |
- | * partial taking into account | + | |
+ | * partial taking into account the ground with small layers of earth or with small blocks of earth in the calculation models | ||
* no depiction of the ground, in a similar way to calculations of regular thermal bridges towards the air | * no depiction of the ground, in a similar way to calculations of regular thermal bridges towards the air | ||
+ | |||
* or the ground is depicted | * or the ground is depicted | ||
Line 23: | Line 24: | ||
* The ground must be depicted with the same length for the x and y directions in both calculation models with at least five or six times the floor slab length (see illustration). | * The ground must be depicted with the same length for the x and y directions in both calculation models with at least five or six times the floor slab length (see illustration). | ||
+ | |||
* The external dimensional reference applies for the floor slab length (in contrast to the DIN EN ISO 10211). This is recommended for a length of 4 metres. | * The external dimensional reference applies for the floor slab length (in contrast to the DIN EN ISO 10211). This is recommended for a length of 4 metres. | ||
+ | |||
* For calculation of the additional conductances, | * For calculation of the additional conductances, | ||
+ | |||
* The block of earth must exhibit adiabatic boundary conditions at the interfaces. | * The block of earth must exhibit adiabatic boundary conditions at the interfaces. | ||
Line 40: | Line 44: | ||
== Characteristic floor slab size == | == Characteristic floor slab size == | ||
| | ||
- | [{{: | + | [{{: |
With the aid of the characteristic floor slab size it is possible to reduce the actual three-dimensional heat flow issue (three-dimensional distribution of the soil around the building) to a two-dimensional heat flow issue as an approximation. | With the aid of the characteristic floor slab size it is possible to reduce the actual three-dimensional heat flow issue (three-dimensional distribution of the soil around the building) to a two-dimensional heat flow issue as an approximation. | ||
The calculation of the corresponding conductances by means of heat flow simulations takes place additionally using an " | The calculation of the corresponding conductances by means of heat flow simulations takes place additionally using an " | ||
basics/building_physics_-_basics/thermal_bridges/tbcalculation/ground_contact/procedure.1470745546.txt.gz · Last modified: 2016/08/09 14:25 by mschueren