planning:thermal_protection:thermal_protection_works:thermal_protection_vs._thermal_storage
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planning:thermal_protection:thermal_protection_works:thermal_protection_vs._thermal_storage [2022/01/18 15:17] – [Literature] yaling.hsiao@passiv.de | planning:thermal_protection:thermal_protection_works:thermal_protection_vs._thermal_storage [2022/02/15 19:57] (current) – admin | ||
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<WRAP center 60%> | <WRAP center 60%> | ||
- | < | ||
$$\rho c \dfrac{\delta T}{\delta t} = - div\,(- \Lambda\, | $$\rho c \dfrac{\delta T}{\delta t} = - div\,(- \Lambda\, | ||
- | </ | ||
</ | </ | ||
The heat equation in general formulation describes the time variation of a temperature field T(x,y,z) in fixed matter (e.g. in a solid body). | The heat equation in general formulation describes the time variation of a temperature field T(x,y,z) in fixed matter (e.g. in a solid body). | ||
- | * Differences in the temperature (gradient //grad//, on the right) propel a heat flux which increases proportional to the relevant component of the thermal conductivity tensor | + | * Differences in the temperature (gradient //grad//, on the right) propel a heat flux which increases proportional to the relevant component of the thermal conductivity tensor |
* The negative divergence of the heat flow is the change of the heat content in the infinitesimal volume element. | * The negative divergence of the heat flow is the change of the heat content in the infinitesimal volume element. | ||
- | * This is the same as the temporal change in temperature | + | * This is the same as the temporal change in temperature |
This equation has proved to be consistently effective in physics and technology. Such different things like heat transfer in stars, in semi-conductor devices, brake pads and many others can be calculated in good correlation with measurements. This equation also applies in building physics – and the calculations made using it correspond just as well with building physical measurements as shown in [[planning: | This equation has proved to be consistently effective in physics and technology. Such different things like heat transfer in stars, in semi-conductor devices, brake pads and many others can be calculated in good correlation with measurements. This equation also applies in building physics – and the calculations made using it correspond just as well with building physical measurements as shown in [[planning: | ||
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(**“Passive houses in Central Europe”**; | (**“Passive houses in Central Europe”**; | ||
\\ | \\ | ||
- | **[AkkP 5]** Energiebilanz und Temperaturverhalten; | + | **[AkkP 5]** Energiebilanz und Temperaturverhalten; |
(**“Energy balance and temperature behaviour”**; | (**“Energy balance and temperature behaviour”**; | ||
planning/thermal_protection/thermal_protection_works/thermal_protection_vs._thermal_storage.txt · Last modified: 2022/02/15 19:57 by admin