basics:building_physics_-_basics:thermal_bridges:tbcalculation:basic_principle_for_calculating_thermal_bridges
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basics:building_physics_-_basics:thermal_bridges:tbcalculation:basic_principle_for_calculating_thermal_bridges [2016/08/02 16:02] – [Example of a thermal bridge calculation] mschueren | basics:building_physics_-_basics:thermal_bridges:tbcalculation:basic_principle_for_calculating_thermal_bridges [2022/02/15 19:12] (current) – admin | ||
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===== Determining the thermal transmittance ===== | ===== Determining the thermal transmittance ===== | ||
- | The principle for calculating the linear thermal transmittance is depicted in the illustration below. The $\Psi$-value represents the difference between the thermally interrupted component and the uninterrupted component that is assumed for the balance. First the heat flow or the conductance $L_{2d}$ is determined by means of the heat flow simulation. To determine the $\Psi$-value, | + | The principle for calculating the linear thermal transmittance is depicted in the illustration below. The $\Psi$-value represents the difference between the thermally interrupted component and the uninterrupted component that is assumed for the balance. First the heat flow or the conductance $L_{2d}$ is determined by means of the heat flow simulation. To determine the $\Psi$-value, |
{{ : | {{ : | ||
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* $\theta_e$ = −5 °C for outdoor air temperature | * $\theta_e$ = −5 °C for outdoor air temperature | ||
- | The Passive House Institute uses the following boundary conditions for the temperature in teh context of **[[certification: | + | The Passive House Institute uses the following boundary conditions for the temperature in the context of **[[certification: |
* $\theta_i$ = 20 °C for indoor air temperature | * $\theta_i$ = 20 °C for indoor air temperature | ||
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<WRAP center 60%> | <WRAP center 60%> | ||
- | < | + | \begin{align} |
- | \begin{equation*} | + | &f_{Rsi}(x, |
- | f_{Rsi}(x, | + | With\qquad&\\ |
- | \end{equation*} | + | f_{Rsi}\qquad&\text{the temperature factor at the location $(x, |
- | \begin{tabular}{ll} | + | \theta_{min}\qquad&\text{the minimum surface temperature at the location $(x, |
- | where & \\ | + | \theta_i\qquad&\text{indoor air temperature}\\\\ |
- | $f_{Rsi} | + | \theta_e\qquad&\text{outdoor air temperature}\\ |
- | $\theta_{min}$ & the minimum surface temperature at the location $(x, | + | \end{align} |
- | $\theta_i$ & indoor air temperature \\ | + | |
- | $\theta_e$ & outdoor air temperature \\ | + | |
- | \end{tabular} | + | |
- | </ | + | |
</ | </ | ||
basics/building_physics_-_basics/thermal_bridges/tbcalculation/basic_principle_for_calculating_thermal_bridges.1470146559.txt.gz · Last modified: 2016/08/02 16:02 by mschueren