Differences

This shows you the differences between two versions of the page.

--- basics:building_physics_-_basics:heat_transfer [2020/09/12 13:17] – wfeist
+++ basics:building_physics_-_basics:heat_transfer [2020/09/12 19:16] – wfeist
@@ Line 10: / Line 10: @@
 The differences in the tendency to transfer heat are quite high between different materials. Air, as long as it is not moving, has a very low thermal conductivity (~0.026 W/(mK)); metals are conduction heat very well: aluminum in the range of 230 W/(mK) - almost 10 000 times that of the air. Insulation materials are nothing more than very lightweight structures, which contain a lot of air (98 to 99,9%) using the low conductivity of gases.
+| Material | thermal conductivity | \\
+|          | W/(mK) | \\
+| Silver| 429| \\
+| Steel| 55| \\
+| Stainless steel| 15| \\
+| steel concrete| 2.4| \\
+| sand stone | 2.1–3.9 |\\
+| brick, full | 0.5–1.4 |\\
+|porous brick | 0.07–0.45 |\\
+|cellulose insulation | 0.035–0.05 |\\
+|mineral wool | 0.032–0.045 |\\
+|straw bale| 0.038–0.067 |\\
+|air (at rest) | 0.026 |\\
+|argon | 0.018 |\\
+|krypton|0.0095|\\
+|vacuum-insulation board | 0.004–0.012 |\\
   * [[basics:building_physics_-_basics:what_defines_thermal_bridge_free_design]]
   * [[planning:thermal_protection:don_t_save_on_the_insulation ]]