planning:building_services:ventilation:differentiation_between_vv_and_vn50_values
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planning:building_services:ventilation:differentiation_between_vv_and_vn50_values [2019/01/24 13:00] – [Single family house - Calculation of TFA, VV and Vn50] cblagojevic | planning: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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^ V< | ^ V< | ||
- | | Reference | + | | Reference |
- | | Calculated by multiplying the TFA times an average room height for the entire building. \\ In the case of residential buildings, a standart | + | | is used to calculate the air exchange rate | is used for the calculation of n< |
+ | | Rough calculation: | ||
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< | + | The air volume V< |
==== Calculation methodology ==== | ==== 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. | 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. | + | Moreover, the volume of a stairwell is part of the air volume and is fully taken into account. |
+ | Therefore, | ||
+ | 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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==== Single family house - Calculation of TFA, VV and Vn50 ==== | ==== Single family house - Calculation of TFA, VV and Vn50 ==== | ||
- | | {{:picopen:grundriss_1_engl.jpg? | + | | {{:picopen:grundriss_englisch.jpg? |
- | | The areas considered for the TFA are highlighted | + | | The area counted in TFA is highlighted |
- | | {{:picopen:grundrisse_2.png? | + | | {{:picopen:grundriss_englisch_2.jpg? |
- | | Sections of example calculation project: | + | | Sections of example calculation project: |
+ | |||
+ | [{{: | ||
- | [{{: | ||
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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: | ||
- | [[https:// | + | [[http:// |
+ | |||
+ | [[planning: | ||
+ | |||
+ | [[planning: | ||
+ | |||
- | [[planning: |
planning/building_services/ventilation/differentiation_between_vv_and_vn50_values.txt · Last modified: 2023/01/30 11:52 by zbastian