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--- basics:building_physics_-_basics:thermal_transmittance [2022/11/09 09:28] – [The heat flow is (usually quite) proportional to the difference in the temperatures] mmursi
+++ basics:building_physics_-_basics:thermal_transmittance [2022/12/07 14:28] (current) – [The heat flow is (usually quite) proportional to the difference in the temperatures] mmursi
@@ Line 33: / Line 33: @@
 |New build exterior walls still commonly used today |0.3 |Also this is not a sufficiently good level of thermal protection. We recommend doing it much better than this!|
 Typical exterior wall after EnerPHit retrofit (year 2020) 0.15 This is the maximum U-value we recommend for a building in Central Europe. It is also the economically optimum level of thermal insulation. Any higher value will only help finance the energy profiteers particularly in countries with petroleum and natural gas.
-Ausgeflockte Foamed?? 24 cm timber construction exterior wall with compound insulation system (resol rigid foam 12 cm) 0.09 This is barely 38 cm thick in total and can be created at reasonable cost - but usually it isn't at all needed in this quality. In this way we could easily build new constructions as nearly zero energy buildings today.
+Ausgeflockte Foamed?? 24 cm timber construction exterior wall with compound insulation system (phenolic rigid foam 12 cm) 0.09 This is barely 38 cm thick in total and can be created at reasonable cost - but usually it isn't at all needed in this quality. In this way we could easily build new constructions as nearly zero energy buildings today.
 Insulated 17 cm timber construction board with 6 cm vacuum insulation (prefabricated) 	0.076 	With 23 cm in total, this is thinner than the older "thin walls". It is worthwhile even if the building plot is very expensive ((This is the thinnest wall with paradoxically phenomenal thermal protection at the same time. "No space" is not an argument for poor insulation!)). \\