basics:building_physics_-_basics:what_defines_thermal_bridge_free_design
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basics:building_physics_-_basics:what_defines_thermal_bridge_free_design [2018/06/18 10:17] – cblagojevic | basics:building_physics_-_basics:what_defines_thermal_bridge_free_design [2019/02/21 09:59] – cblagojevic | ||
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<WRAP centeralign > | <WRAP centeralign > | ||
- | $$H_{T} = \sum_{i}A_{i}U_{i}+\sum_{k}l_{k}\varPsi_{k}+\sum_{j}\chi_{j}$$ | + | < |
+ | \Large{H_{T} = \sum_{i}A_{i}U_{i}+\sum_{k}l_{k}\varPsi_{k}+\sum_{j}\chi_{j}} | ||
+ | </ | ||
</ | </ | ||
| | ||
<WRAP centeralign | <WRAP centeralign | ||
- | $$\sum\varPsi \cdot l + \sum\chi | + | < |
+ | \Large{\sum\varPsi \cdot l + \sum\chi | ||
+ | </ | ||
+ | \\ | ||
+ | \\ | ||
** [defined as thermal bridge free]** | ** [defined as thermal bridge free]** | ||
</ | </ | ||
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It will then be admissible to disregard the thermal bridge effects in the PHPP, thus simplifying the calculation quite considerably. This equates to the statement $ \Delta U_{WB} \leq 0$, where $\Delta U_{WB}$ is the thermal bridge correction addend (as used in the German energy saving regulations for example)\\ | It will then be admissible to disregard the thermal bridge effects in the PHPP, thus simplifying the calculation quite considerably. This equates to the statement $ \Delta U_{WB} \leq 0$, where $\Delta U_{WB}$ is the thermal bridge correction addend (as used in the German energy saving regulations for example)\\ | ||
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- | [{{ : | ||
===== Simplified criterion ===== | ===== Simplified criterion ===== | ||
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Verification using this definition of thermal bridge free design would imply that all details would have to be calculated in a multi-dimensional way. Therefore, simplified criteria for “thermal bridge free design” should be devised. It was found that for ordinary building geometries, the “thermal bridge free” requirement was almost always adequately met for all linear disturbances only if | Verification using this definition of thermal bridge free design would imply that all details would have to be calculated in a multi-dimensional way. Therefore, simplified criteria for “thermal bridge free design” should be devised. It was found that for ordinary building geometries, the “thermal bridge free” requirement was almost always adequately met for all linear disturbances only if | ||
<WRAP centeralign | <WRAP centeralign | ||
- | $$\varPsi \leq 0.01 \quad W/(mK)$$ **[TbCrit]** | + | < |
+ | \Large{\varPsi \leq 0.01 \quad W/(mK)} | ||
+ | </ | ||
+ | \\ | ||
+ | **[TbCrit]** | ||
</ | </ | ||
These may still result in certain positive contributions, | These may still result in certain positive contributions, | ||
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[{{: | [{{: | ||
- | [{{: | + | [{{: |
</ | </ | ||
basics/building_physics_-_basics/what_defines_thermal_bridge_free_design.txt · Last modified: 2022/02/15 19:13 by admin