User Tools

Site Tools


construction:quality_assurance:thermal_bridges

Differences

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

Link to this comparison view

Both sides previous revisionPrevious revision
Next revision
Previous revision
construction:quality_assurance:thermal_bridges [2017/11/17 13:30] kdreimaneconstruction:quality_assurance:thermal_bridges [2018/11/05 11:40] (current) cblagojevic
Line 10: Line 10:
 \\ \\
 |{{ :picopen:abb_1a_thermal bridges_quality assurance.jpg?250 }}|{{ :picopen:abb_1b_thermal bridges_quality assurance.jpg?250 }}|**Connection of basement to external wall:**\\ the insulation has been embedded only 25cm\\ into the ground for financial reasons;\\ in addition, a frost apron has been laid\\ along the outside;\\ Ψ<sub>a</sub> = 0.134W/(mK)| |{{ :picopen:abb_1a_thermal bridges_quality assurance.jpg?250 }}|{{ :picopen:abb_1b_thermal bridges_quality assurance.jpg?250 }}|**Connection of basement to external wall:**\\ the insulation has been embedded only 25cm\\ into the ground for financial reasons;\\ in addition, a frost apron has been laid\\ along the outside;\\ Ψ<sub>a</sub> = 0.134W/(mK)|
-|{{ :picopen:abb_2a_thermal bridges_quality assurance.jpg?250 }}|{{ :picopen:abb_2b_thermal bridges_quality assurance.jpg?250 }}|**Connection of internal celler wall to \\ brickwork on the ground floor:**\\ due to the vertical continuation of the\\ basement wall insulation downwards\\ (30cm), a Ψ <sub>a</sub> of 0.30W/(mK)\\ was achieved; for walls with a thickness\\ of 38cm, this Ψ<sub>a</sub> = 0.46W/(mK)|+|{{ :picopen:abb_2a_thermal bridges_quality assurance.jpg?250 }}|{{ :picopen:abb_2b_thermal bridges_quality assurance.jpg?250 }}|**Connection of internal cellar wall to \\ brickwork on the ground floor:**\\ due to the vertical continuation of the\\ basement wall insulation downwards\\ (30cm), a Ψ <sub>a</sub> of 0.30W/(mK)\\ was achieved; for walls with a thickness\\ of 38cm, this Ψ<sub>a</sub> = 0.46W/(mK)|
 |{{ :picopen:abb_3a_thermal bridges_quality assurance.jpg?250 }}|{{ :picopen:abb_3b_thermal bridges_quality assurance.jpg?250 }}|**Knee wall:**\\ Completely insulating the knee wall\\ with a thickness of 20cm laterally\\ and 10cm above gave a\\ Ψ<sub>a</sub> = 0.056W/(mK) | |{{ :picopen:abb_3a_thermal bridges_quality assurance.jpg?250 }}|{{ :picopen:abb_3b_thermal bridges_quality assurance.jpg?250 }}|**Knee wall:**\\ Completely insulating the knee wall\\ with a thickness of 20cm laterally\\ and 10cm above gave a\\ Ψ<sub>a</sub> = 0.056W/(mK) |
 |{{ :picopen:abb_4a_thermal bridges_quality assurance.jpg?250 }}|{{ :picopen:abb_4b_thermal bridges_quality assurance.jpg?250 }}|**Windows:**\\ thermal bridges comparable to the situation\\ in a new build with Ψ<sub>a</sub> = 0.017W/(mK)\\ for the connection detail on the side;\\ the lower area of the metal window sill has\\ Ψ<sub>a</sub> = 0.030W/(mK) | |{{ :picopen:abb_4a_thermal bridges_quality assurance.jpg?250 }}|{{ :picopen:abb_4b_thermal bridges_quality assurance.jpg?250 }}|**Windows:**\\ thermal bridges comparable to the situation\\ in a new build with Ψ<sub>a</sub> = 0.017W/(mK)\\ for the connection detail on the side;\\ the lower area of the metal window sill has\\ Ψ<sub>a</sub> = 0.030W/(mK) |
-//**Illustration 1: (source: left PHI, right Schulze Darup)**//\\+//**Illustration 1:** (source: left PHI, right Schulze Darup)//\\
 \\ \\
  
-[{{ :picopen:infrared_thermographic_image_after_completion_of_the_exterior_thermal_insulation_compound_system.png?400|//**Illustration 2: Infrared thermographic image after completion of the exterior thermal insulation compound system,\\ before installation of the balcony: the four reinforcing attachment points of the balcony can be seen as well as the\\ traces of the attachment of the temperature sensor under the ground floor window on the right. For comparison:\\ on the right side of the thermographic image there is a similar but non-renovated existing building (source: PHI)**//}}]+[{{ :picopen:infrared_thermographic_image_after_completion_of_the_exterior_thermal_insulation_compound_system.png?400| //**Illustration 2:** Infrared thermographic image after completion of the exterior thermal insulation compound system, before installation of the balcony: the four reinforcing attachment points of the balcony can be seen as well as the traces of the attachment of the temperature sensor under the ground floor window on the right. For comparison: on the right side of the thermographic image there is a similar but non-renovated existing building (source: PHI)//}}] 
 + 
 +[{{ :picopen:thermographic_image_of_the_inside_of_the_ground_floor_base_area_at_a_corner_of_the_building.png?500| //**Illustration 3:** Thermographic image of the inside of the ground floor base area at a corner of the building (source: PHI)//}}] 
 Quality assurance with respect to thermal bridge effects initially takes place by optimising the details based on the calculation of the thermal bridges. The purpose of construction planning is to meticulously examine the building for any possible thermal bridges effects. Studying a cross-section is not enough; three-dimensional problematic areas and point thermal bridges must also be checked. For the connection details, e.g. of windows, detailed examinations should be carried out regarding the profiles and window glass edge systems as well as the installation situation. Quality assurance with respect to thermal bridge effects initially takes place by optimising the details based on the calculation of the thermal bridges. The purpose of construction planning is to meticulously examine the building for any possible thermal bridges effects. Studying a cross-section is not enough; three-dimensional problematic areas and point thermal bridges must also be checked. For the connection details, e.g. of windows, detailed examinations should be carried out regarding the profiles and window glass edge systems as well as the installation situation.
  
Line 23: Line 26:
 An inspection with infrared thermographic imaging, which makes the infrared radiation visible in a series of colours, can be carried out to assess the thermal building envelope. The following illustrations show infrared images of the same building after completion of the energy-efficient modernisation.\\ An inspection with infrared thermographic imaging, which makes the infrared radiation visible in a series of colours, can be carried out to assess the thermal building envelope. The following illustrations show infrared images of the same building after completion of the energy-efficient modernisation.\\
  
 +[{{ :picopen:the_thermographic_image_shows_warm_surfaces.png?nolink400|//**Illustration 4:** The thermographic image shows warm surfaces for the glazing, frames and external wall as well as the thermal bridge at the glass edge system. The base point thermal bridge below at the transition of the external wall and basement ceiling can also be seen. (source: PHI)//}}]
  
------------- 
-\\ 
-|{{ :picopen: base area_thermogr._thermal bridges_quality assurance.jpg?400 }}|{{ :picopen: base area_thermal bridges_quality assurance.jpg?370 }}| 
-|//**Illustration 3: Thermographic image of the inside of the ground floor base area at a corner of the building (source: PHI)**//||\\ 
-\\ 
------------- 
-\\ 
-|{{ :picopen:window_thermogr._ thermal bridges_quality assurance.jpg?300 }}|{{ :picopen:window_thermal bridges_quality assurance.jpg?294 }}| 
-|//**Illustration 4: The thermographic image shows warm surfaces for the glazing, frames and external\\ wall as well as the thermal bridge at the glass edge system. The base point thermal bridge below\\ at the transition of the external wall and basement ceiling can also be seen. (source: PHI)**//||\\ 
-\\ 
 A particularly interesting aspect is the comparison of the thermographic imaging with the set values of the thermal bridge calculation. It is important that the respective boundary conditions that exist are also compared in the process. The set values of the thermal bridge calculation are compared with the measured values of the thermographic images using two examples for the building’s base.\\ A particularly interesting aspect is the comparison of the thermographic imaging with the set values of the thermal bridge calculation. It is important that the respective boundary conditions that exist are also compared in the process. The set values of the thermal bridge calculation are compared with the measured values of the thermographic images using two examples for the building’s base.\\
-\\+----
 |{{ :picopen:External wallbasement ceiling_set temp._thermal bridges_quality assurance.jpg?240 }}|{{ :picopen:External wallbasement ceiling_thermal bridges_quality assurance.jpg?200 }}|//**External wall/basement ceiling:**\\ at the lower edge of the insulation apron,\\ the set temperature is slightly lower\\ (reason: cooling of the basement\\ during the construction period)//| |{{ :picopen:External wallbasement ceiling_set temp._thermal bridges_quality assurance.jpg?240 }}|{{ :picopen:External wallbasement ceiling_thermal bridges_quality assurance.jpg?200 }}|//**External wall/basement ceiling:**\\ at the lower edge of the insulation apron,\\ the set temperature is slightly lower\\ (reason: cooling of the basement\\ during the construction period)//|
 |{{ :picopen:External wall at base_set temp._thermal bridges_quality assurance.jpg?240 }}|{{ :picopen:External wall at base_thermal bridges_quality assurance.jpg?200 }}|//**External wall at base on the ground floor:**\\ The set temperatures and measured\\ temperatures match; the temperature\\ is 1.5K lower in the corner of the room,\\ as expected.//| |{{ :picopen:External wall at base_set temp._thermal bridges_quality assurance.jpg?240 }}|{{ :picopen:External wall at base_thermal bridges_quality assurance.jpg?200 }}|//**External wall at base on the ground floor:**\\ The set temperatures and measured\\ temperatures match; the temperature\\ is 1.5K lower in the corner of the room,\\ as expected.//|
-//**Illustration 5 (source: PHI)**//\\+//**Illustration 5** (source: PHI)//\\
 \\ \\
  
 ===== See also ===== ===== See also =====
-[[construction:quality_assurance:airtightness_and_wind_proofing|]]\\ +[[construction:quality_assurance:airtightness_and_wind_proofing|]]  {{:picopen:members_only.png?25|}}\\ 
-[[construction:quality_assurance:final_approval_and_initial_use|]]\\+[[construction:quality_assurance:final_approval_and_initial_use|]]  {{:picopen:members_only.png?25|}}\\
 [[construction:quality_assurance:nuremberg_case_study|]]\\ [[construction:quality_assurance:nuremberg_case_study|]]\\
  
  
  
construction/quality_assurance/thermal_bridges.1510921850.txt.gz · Last modified: 2017/11/17 13:30 by kdreimane