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basics:building_physics_-_basics:heat_transfer

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 basics:building_physics_-_basics:heat_transfer [2016/07/26 12:07]sahmed basics:building_physics_-_basics:heat_transfer [2016/08/09 16:30] (current)mschueren Both sides previous revision Previous revision 2016/08/09 16:30 mschueren 2016/07/26 12:07 sahmed 2016/07/26 12:07 sahmed 2016/07/26 12:06 sahmed 2016/07/26 12:06 sahmed 2016/07/26 12:05 sahmed 2016/07/21 13:42 kdreimane 2016/07/20 14:27 sahmed 2016/07/13 10:26 sahmed 2016/07/13 10:26 sahmed 2016/07/05 11:39 sahmed 2016/07/05 11:37 sahmed 2016/07/05 09:36 sahmed 2016/07/05 09:32 sahmed 2016/07/05 09:30 sahmed 2014/09/18 18:19 external edit2010/07/05 11:33 edit created 2016/08/09 16:30 mschueren 2016/07/26 12:07 sahmed 2016/07/26 12:07 sahmed 2016/07/26 12:06 sahmed 2016/07/26 12:06 sahmed 2016/07/26 12:05 sahmed 2016/07/21 13:42 kdreimane 2016/07/20 14:27 sahmed 2016/07/13 10:26 sahmed 2016/07/13 10:26 sahmed 2016/07/05 11:39 sahmed 2016/07/05 11:37 sahmed 2016/07/05 09:36 sahmed 2016/07/05 09:32 sahmed 2016/07/05 09:30 sahmed 2014/09/18 18:19 external edit2010/07/05 11:33 edit created Line 5: Line 5: The physical dimension for the extent of heat transfer is the heat flow rate, that is the power which passes through a square metre of a surface which is perpendicular to a surface measured in W/m² (watts per square metre). As a rule the heat flow rate (at least with small temperature differences) is proportional to the difference between the temperatures. If divided by the temperature difference, the result will be a value which characterises the heat transfer capacity of the envelope surface of the building component: this is the thermal transmittance or U-value. This is measured in W/(m²K) (watts per square metre per kelvin), whereby a temperature difference of 1 K is exactly the same as a temperature difference of 1 °C. The physical dimension for the extent of heat transfer is the heat flow rate, that is the power which passes through a square metre of a surface which is perpendicular to a surface measured in W/m² (watts per square metre). As a rule the heat flow rate (at least with small temperature differences) is proportional to the difference between the temperatures. If divided by the temperature difference, the result will be a value which characterises the heat transfer capacity of the envelope surface of the building component: this is the thermal transmittance or U-value. This is measured in W/(m²K) (watts per square metre per kelvin), whereby a temperature difference of 1 K is exactly the same as a temperature difference of 1 °C. - * [[basics:​building_physics_-_basics:​heat_transfer:​what_defines_thermal_bridge_free_design|What defines thermal bridge free design? ​]] + * [[basics:​building_physics_-_basics:​what_defines_thermal_bridge_free_design]] * [[planning:​thermal_protection:​don_t_save_on_the_insulation ]] * [[planning:​thermal_protection:​don_t_save_on_the_insulation ]]