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--- phi_publications:pb_35:appendix_a_punctiform_penetrations_of_thermally_insulated_exterior_walls [2024/01/19 13:51] – gergina.radeva@passiv.de
+++ phi_publications:pb_35:appendix_a_punctiform_penetrations_of_thermally_insulated_exterior_walls [2024/01/19 14:12] (current) – gergina.radeva@passiv.de
@@ Line 15: / Line 15: @@
 |Masonry wall|25 cm|0.151 W/(m²K)|0.0040 W/K|0.167 W/(m²K)|10.6 %|
 |Reinforced concrete|30 cm|0.129 W/(m²K)|0.0037 W/K|0.143 W/(m²K)|11.5 %|
 |Reinforced concrete|25 cm|0.153 W/(m²K)|0.0042 W/K|0.170 W/(m²K)|11.0 %|
+|**Table A1: Worsening of the U-value of the uninterrupted exterior wall due to ventilated rainscreen cladding with four steel anchors per m² each with a diameter of 6 mm **|
+The results are presented in detail in the following illustrations. The boundary conditions of the calculations can be seen in Table A2:
+|**Components**|**Thermal conductivity [W/(mK)]**|
+|Plaster|0.7|
+|Thermal insulation|0.04|
+|Sand-lime bricks|1.0|
+|Reinforced concrete|2.3|
+|Structural steel|50|
+|High-grade steel|17|
+|**Table A2: Characteristic values of materials**|
+[{{ :picopen:fig_a2.jpg?600 |**Fig. A2: $\chi $-values for structural steel and high-grade steel penetrations in exterior walls consisting of sand-lime bricks with a thermal insulation thickness of 30 cm**}}]
+[{{ :picopen:fig_a3.jpg?600 |**Fig. A3: $\chi $-values for structural steel and high-grade steel penetrations in exterior walls consisting of reinforced concrete with a thermal insulation thickness of 30 cm**}}]
+[{{ :picopen:fig_a4.jpg?600 |**Fig. A4: $\chi $-values for structural steel and high-grade steel penetrations in exterior walls consisting of sand-lime bricks with a thermal insulation thickness of 25 cm**}}]
+[{{ :picopen:fig_a5.jpg?600 |**Fig. A5: $\chi $-values for structural steel and high-grade steel penetrations in exterior walls consisting of reinforced concrete with an insulation thickness of 25 cm**}}]
+In addition to steel anchors and rods, brackets are also often used to attach façades or balconies. The extent to which the -values of round cross-sections can be transferred to angular cross-sections is analysed in another calculation (Fig. A6).
+[{{:picopen:fig_a6.jpg?400 |**Fig. A6: position of a steel bracket on the exterior wall**}}]
+\\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\
+In doing so, it is assumed that the cross-section of the steel rod and steel bracket penetrating the insulation remains the same (Fig. A7).
+[{{:picopen:fig_a7.jpg?400 |**Fig. A7: Cross-section area of the steel rod and steel bracket **}}]
+\\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\
+A relatively good correlation was seen for penetrating cross-sections. The longer and thinner the cross-section is, the greater the deviation from the $\chi $-value of the round cross-section. As a rough estimate, the $\chi $-value of the equivalent round cross-section can be increased by 50 % for unfavourable angular cross-sections.