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--- planning:building_services:ventilation:differentiation_between_vv_and_vn50_values [2020/05/11 15:40] – [Differentiation between Vv and Vn50 values] egollwitzer
+++ planning:building_services:ventilation:differentiation_between_vv_and_vn50_values [2022/01/12 15:08] – [Calculation methodology] yaling.hsiao@passiv.de
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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. |
 | 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 + lifts) 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.
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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.
-The volume of elevator shafts and any other kind of shafts inside the thermal envelope are part of the air volume and is fully taken into account. The volume of  the elevator, pipes etc. themselves (building component) is not taken into account, therefore it is not deducted. The base area of the shaft can thus be multiplied with the clear height of the storey.
+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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