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 11:52] (current) – [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 ==== | ||
- | The base area of each room should be multiplied by the average clear height of the room. Overall assumptions for determining the internal volume of the enclosed space (gross volume) by means of a reduction factor are not permissible. \\ | + | ===== Example ===== |
- | The base area to be used for this calculation differs from the treated floor area (TFA) which is normally used. The TFA follows certain rules and applies certain percentages for considering areas from the energy use point of view. The base area for consideration the V< | + | |
- | As mentioned before, the V< | + | ==== Single family house - Calculation |
- | A full and comprehensible room-by-room calculation of the volume must be provided | + | | {{: |
+ | | The area counted in TFA is highlighted blue and yellow. | The area to be considered | ||
- | Visible rafters, beams, plasterboard encasings, wall-mounted installations (if these do not have the same height as the room) and the like are not taken into account; in the calculation they are not deducted for simplification. They are thus treated as if they did not exist (= air space). | ||
- | 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. | + | | {{: |
+ | | Sections of example calculation project: | ||
- | 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. | + | [{{: |
- | ---- | ||
- | ===== Example ===== | ||
- | ==== Single family house - Calculation of TFA, VV and Vn50 ==== | + | ---- |
- | | {{: | ||
- | | The areas considered for the TFA are highlighted with different colours. | The net areas to be considered for the calculation of the V< | ||
+ | A more detailed explanation can be found in the following sources: | ||
- | | {{:picopen: | + | [[http://passiv.de/downloads/ |
- | | Sections of example calculation project: the net areas to be considered for the calculation of the V< | + | |
- | [{{: | + | [[planning: |
+ | [[planning: | ||
- | ---- | ||
- | |||
- | |||
- | A more detailed explanation can be found in the following sources: | ||
- | |||
- | [[https:// | ||
- | [[planning: |
planning/building_services/ventilation/differentiation_between_vv_and_vn50_values.1548331248.txt.gz · Last modified: 2019/01/24 13:00 by cblagojevic