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planning:building_services:ventilation:differentiation_between_vv_and_vn50_values

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planning:building_services:ventilation:differentiation_between_vv_and_vn50_values [2019/02/27 09:01] – [Single family house - Calculation of TFA, VV and Vn50] cblagojevicplanning:building_services:ventilation:differentiation_between_vv_and_vn50_values [2023/01/30 11:37] – [Vn50 – Net air volume for pressurisation test] zbastian
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 | Reference volume of the ventilation system   | Value of air volume that will be heated or cooled for calculating the n<sub>50</sub> leakage value. | | Reference volume of the ventilation system   | Value of air volume that will be heated or cooled for calculating the n<sub>50</sub> leakage value. |
 | is used to calculate the air exchange rate | is used for the calculation of n<sub>50</sub> |  | is used to calculate the air exchange rate | is used for the calculation of n<sub>50</sub> | 
-| Rough calculation: \\ Calculated by multiplying the TFA times an average room height for the entire building. \\ In the case of residential buildings, a standard height of 2.50 m should be considered, regardless of the actual height. | Exact caltulation: \\ All rooms of the building (including the stairs) are calculated separately by multiplying the net area times the clear room height. |+| Rough calculation: \\ Calculated by multiplying the TFA times an average room height for the entire building. \\ In the case of residential buildings, a standard height of 2.50 m should be considered, regardless of the actual height. | Exact caltulation: \\ All rooms of the building (including the stairs + elevator) are calculated separately by multiplying the net area times the clear room height. |
  
 The next sections provide a detailed description of both values and their calculation.  The next sections provide a detailed description of both values and their calculation. 
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 ===== Vn50 – Net air volume for pressurisation test ===== ===== Vn50 – Net air volume for pressurisation test =====
  
-The air volume V<sub>n50</sub> within the heated building envelope is the volume that will be used for calculating [[planning:airtight_construction:general_principles:blower_door_test|the n50 air leakage value]]. It is supposed to indicate the //actual// volume of air that will be heated or cooled within the building and should be calculated separately for each room. The calculation should be carried out in accordance with the EN 13829 standard and must be clearly documented. The total air volume within the thermal envelope should be taken into account.  +The air volume V<sub>n50</sub> within the heated building envelope is the volume that will be used for calculating [[planning:airtight_construction:general_principles:blower_door_test|the n50 air leakage value]]. It is supposed to indicate the //actual// volume of air that will be heated or cooled within the building and should be calculated separately for each room. The calculation should be carried out in accordance with detailed rules given in the [[https://passivehouse.com/downloads/03_building_criteria_en.pdf| Criteria for Buildings]], section 3.2.10 Airtightness of the building envelope.  
  
 ==== Calculation methodology ==== ==== Calculation methodology ====
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 Therefore, the base floor area of the stairwell is simply multiplied by the clear height of the storey. The volume for flights of stairs and intermediate landings does not have to be subtracted. Therefore, the base floor area of the stairwell is simply multiplied by the clear height of the storey. The volume for flights of stairs and intermediate landings does not have to be subtracted.
  
- +The air volume of elevator shafts and of any other kind of shafts inside the thermal envelope is part of the Vn50 and is fully taken into account. The volume of the elevator cabin as well as of pipes, ducts etc. themselves counts as part of the Vn50 in a simplified way and is not deducted. The base area of the shaft can thus be multiplied with the clear height of the storey.
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 |    Sections of example calculation project: The area to be considered for the V<sub>n50</sub> calculation  is highlighted green.    | |    Sections of example calculation project: The area to be considered for the V<sub>n50</sub> calculation  is highlighted green.    |
  
-[{{:picopen:excell_englisch.jpg?direct&800|}}]+[{{:picopen:calculation_en.jpg?direct&800|}}] 
  
  
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 A more detailed explanation can be found in the following sources: A more detailed explanation can be found in the following sources:
  
-[[http://passiv.de/downloads/Building_Certification_Guide/#p=58|Certification guide]]+[[http://passiv.de/downloads/Building_Certification_Guide/#p=58| Building Certification Guide]]
  
 [[planning:airtight_construction:airtightness_measurements_in_passive_houses|Airtightness measurements in Passive Houses]] {{:picopen:members_only.png?nolink&20|}} [[planning:airtight_construction:airtightness_measurements_in_passive_houses|Airtightness measurements in Passive Houses]] {{:picopen:members_only.png?nolink&20|}}
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-{{:picopen:sinfonia_logo_cmyk_hr.jpg?nolink&160|}} //SINFONIA stands for “**S**mart **IN**itiative of cities **F**ully c**O**mmited to i**N**vest in **A**dvanced large-scaled energy solutions”. This project has received funding from the European Union’s Seventh Programme for research, technological development and demonstration under grant agreement No 609019. // 
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-{{:picopen:azeb.jpg?nolink&80|}}  //AZEB stands for “Affordable Zero Energy Buildings”. This project has received funding from the European Union's Horizon 2020 research and innovation programme under grant agreement No 754174.// 
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-{{:picopen:euroflagge.jpg?nolink&120|}} //This sole responsibility for the content of this publication lies with the authors. It does not necessarily reflect the opinion of the European Commission are responsible for any use that may be made of the information contained therein.// 
  
planning/building_services/ventilation/differentiation_between_vv_and_vn50_values.txt · Last modified: 2023/01/30 11:52 by zbastian