basics:building_physics_-_basics:thermal_bridges:tbcalculation:examples:ewfs
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basics:building_physics_-_basics:thermal_bridges:tbcalculation:examples:ewfs [2019/02/13 09:17] – cblagojevic | basics:building_physics_-_basics:thermal_bridges:tbcalculation:examples:ewfs [2022/08/08 12:14] (current) – yaling.hsiao@passiv.de | ||
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===== Calculation model ===== | ===== Calculation model ===== | ||
- | First, | + | First, |
In the following illustration all relevant reference dimensions and boundary conditions are included. Ultimately, it is irrelevant which boundary conditions for the temperature are used for determining the conductances; | In the following illustration all relevant reference dimensions and boundary conditions are included. Ultimately, it is irrelevant which boundary conditions for the temperature are used for determining the conductances; | ||
<WRAP centeralign> | <WRAP centeralign> | ||
**Calculating the conductance** | **Calculating the conductance** | ||
- | < | ||
$L_{2d}$ | $L_{2d}$ | ||
- | </ | ||
</ | </ | ||
- | {{ :picopen:aussenwand_auf_bodenplatte_abb_8a.png?600 |}} | + | |
+ | {{ :picopen:01_updated_-_aussenwand_auf_bodenplatte_abb_8a.png?600 |}} | ||
{{ : | {{ : | ||
+ | |||
<WRAP centeralign> | <WRAP centeralign> | ||
- | < | + | $$ |
- | $$\.q = 19{,}488 \, \frac{\text{W}}{\text{m}}$$ | + | \dot{q} = 19{,}488 \, \frac{\text{W}}{\text{m}} |
- | $$L_{2d} = \frac{\.q}{T_i-T_e} = \frac{19{, | + | $$ |
- | </ | + | </ |
+ | |||
+ | <WRAP centeralign> | ||
+ | $$ | ||
+ | \large{L_{2d} = \frac{\dot{q}}{T_i-T_e} = \frac{19{, | ||
+ | $$ | ||
</ | </ | ||
Line 44: | Line 49: | ||
<WRAP centeralign> | <WRAP centeralign> | ||
**Conductance of the floor slab** | **Conductance of the floor slab** | ||
- | < | ||
$L_{BP}$ | $L_{BP}$ | ||
- | </ | ||
</ | </ | ||
- | {{ :picopen:aussenwand_auf_bodenplatte_abb_9a.png?600 |}} | + | {{ :picopen:02_updated_-_aussenwand_auf_bodenplatte_abb_9a.png?600 |}} |
{{ : | {{ : | ||
<WRAP centeralign> | <WRAP centeralign> | ||
- | < | + | $$ |
- | $$\.q = 14{,}023 \, \frac{\text{W}}{\text{m}}$$ | + | \dot{q} = 14{,}023 \, \frac{\text{W}}{\text{m}} |
- | $$L_{BP} = \frac{\.q}{T_i-T_e} = \frac{14{, | + | $$ |
- | </ | + | </ |
+ | |||
+ | <WRAP centeralign> | ||
+ | $$ | ||
+ | \large{L_{BP} = \frac{\dot{q}}{T_i-T_e} = \frac{14{, | ||
+ | $$ | ||
</ | </ | ||
Line 65: | Line 73: | ||
<WRAP centeralign> | <WRAP centeralign> | ||
**Conductance of the exterior wall** | **Conductance of the exterior wall** | ||
- | < | ||
$L_{AW}$ | $L_{AW}$ | ||
- | </ | ||
</ | </ | ||
<WRAP centeralign> | <WRAP centeralign> | ||
- | < | + | $$ |
- | $$U_{AW} = 0{,}1205 \, \frac{\text{W}}{\text{m}^2 \cdot \text{K}}$$ | + | U_{AW} = 0{,}1205 \, \frac{\text{W}}{\text{m}^2 \cdot \text{K}} |
- | $$L_{AW} = l_{AW} \cdot U_{AW} = 2{,}03 \cdot 0{,}1205 = 0{,}2446 \, \frac{\text{W}}{\text{m} \cdot \text{K}}}$$ | + | $$ |
- | </ | + | </ |
+ | |||
+ | <WRAP centeralign> | ||
+ | $$ | ||
+ | \large{L_{AW} = l_{AW} \cdot U_{AW} = 2{,}03 \cdot 0{,}1205 = 0{,}2446 \, \frac{\text{W}}{\text{m} \cdot \text{K}}} | ||
+ | $$ | ||
</ | </ | ||
Line 83: | Line 94: | ||
<WRAP centeralign> | <WRAP centeralign> | ||
- | < | + | $$ |
- | $$\Psi = L_{2d}-L_{AW}-L_{BP}=0{, | + | \large{\Psi = L_{2d}-L_{AW}-L_{BP}=0{, |
- | </ | + | $$ |
</ | </ | ||
Line 103: | Line 114: | ||
<WRAP centeralign> | <WRAP centeralign> | ||
** Determining the minimum surface temperature and** | ** Determining the minimum surface temperature and** | ||
- | < | ||
$f_{Rsi}$ | $f_{Rsi}$ | ||
- | </ | ||
</ | </ | ||
- | {{ :picopen:aussenwand_auf_bodenplatte_abb_10a.png?600 |}} | + | {{ :picopen:updated_03-_aussenwand_auf_bodenplatte_abb_10a.png?600 |}} |
{{ : | {{ : | ||
<WRAP centeralign> | <WRAP centeralign> | ||
- | < | + | $$ |
- | $$f_{Rsi \, = \, 0{,}25} = \frac{17{, | + | f_{Rsi \, = \, 0{,}25} = \frac{17{, |
- | </ | + | $$ |
</ | </ | ||
basics/building_physics_-_basics/thermal_bridges/tbcalculation/examples/ewfs.1550045879.txt.gz · Last modified: 2019/02/13 09:17 by cblagojevic