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--- planning:building_services:ventilation:differentiation_between_vv_and_vn50_values [2019/01/24 10:46] – cblagojevic
+++ planning:building_services:ventilation:differentiation_between_vv_and_vn50_values [2023/01/30 11:37] – [Vn50 – Net air volume for pressurisation test] zbastian
@@ Line 5: / Line 5: @@
 ^    V<sub>v</sub>    ^    V<sub>n50</sub>    ^
-| Reference value for calculation of heat losses of 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. |
-| Calculated by multiplying the TFA times an average room height for the entire building. \\ In the case of residential buildings, a standart height of 2.50 m should be considered, regardless of the actual height. | Calculated on a room by room basis, of all rooms of the building (including the stairs) multiplying the net area times the clear room height. |
+| 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 + 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.
@@ Line 24: / Line 25: @@
 ===== 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 lekage 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 (including staircases).
+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 ====
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 The volume of window reveals is not taken into account either (measured only up to the inner wall surface). The same applies in the case of doors and openings. Please note that these stipulations are for the purpose of simplification. Any deviations occurring as a result are usually small.
-Moreover, the volume of a stairwell is part of the air volume and is fully taken into account. The volume of the stairs themselves (building component) is not taken into account, therefore it is not deducted. The base area of the stairwell can thus be multiplied with the clear height of the storey.
+Moreover, the volume of a stairwell is part of the air volume and is fully taken into account.
+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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@@ Line 48: / Line 50: @@
 ==== Single family house - Calculation of TFA, VV and Vn50  ====
-|  {{:picopen:grundriss_1_engl.jpg?direct&800|}}    ||
+| {{:picopen:grundriss_englisch.jpg?direct&800|}}  ||
-| The areas considered for the TFA are highlighted with different colours. | The net areas to be considered for the calculation of the V<sub>n50</sub> are highlighted with green. |
+| The area counted in TFA is highlighted blue and yellow. | The area to be considered for the V<sub>n50</sub> calculation is highlighted green. |
-| {{:planning:building_services:ventilation:grundriss_2_engl.jpg?direct&600|}}|
+| {{:picopen:grundriss_englisch_2.jpg?direct&600|}} |
-|    Sections of example calculation project: the net areas to be considered for the calculation of the V<sub>n50</sub> are highlighted with green.    |
+|    Sections of example calculation project: The area to be considered for the V<sub>n50</sub> calculation  is highlighted green.    |
+[{{:picopen:calculation_en.jpg?direct&800|}}]
-[{{:picopen:excell_englisch.jpg?direct&700|}}]
@@ Line 64: / Line 67: @@
 A more detailed explanation can be found in the following sources:
-[[https://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:refurbishment_with_passive_house_components:thermal_envelope:airtightness|Airtightness - how and why?]]
-[[planning:airtight_construction:airtightness_measurements_in_passive_houses|In depth article (iPHA Members)]] {{:picopen:members_only.png?nolink&20|}}