planning:building_services:ventilation:basics:air_volumes
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planning:building_services:ventilation:basics:air_volumes [2014/09/18 18:19] – external edit 127.0.0.1 | planning:building_services:ventilation:basics:air_volumes [2019/03/20 10:58] (current) – cblagojevic | ||
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* Experience with operation and evaluations of measured data (e.g. evaluation of the switch position during operation in the multi-storey building in Kassel Marbachshöhe) have shown that the systems are almost always operated at the " | * Experience with operation and evaluations of measured data (e.g. evaluation of the switch position during operation in the multi-storey building in Kassel Marbachshöhe) have shown that the systems are almost always operated at the " | ||
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* Even in single-family houses, the air volumes are only adjusted for longer periods of absence. | * Even in single-family houses, the air volumes are only adjusted for longer periods of absence. | ||
Nevertheless, | Nevertheless, | ||
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First of all, the linear characteristics of the ducting network have to be determined by dimensioning the duct cross-sections and the loss of pressure including that of all installations. | First of all, the linear characteristics of the ducting network have to be determined by dimensioning the duct cross-sections and the loss of pressure including that of all installations. | ||
* Based on these linear characteristics, | * Based on these linear characteristics, | ||
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* The device must still be able to transport the air flows necessary for purge ventilation (not with maximum efficiency as the operation periods in the purge ventilation mode are relatively short), and it must also be possible to achieve the minimum output of 0.3 1/h. | * The device must still be able to transport the air flows necessary for purge ventilation (not with maximum efficiency as the operation periods in the purge ventilation mode are relatively short), and it must also be possible to achieve the minimum output of 0.3 1/h. | ||
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* the intensity of the internal humidity sources (e.g. plants, cooking, drying clothes, | * the intensity of the internal humidity sources (e.g. plants, cooking, drying clothes, | ||
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* the amount of fresh air supplied from outside. | * the amount of fresh air supplied from outside. | ||
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**No-one should have to ventilate beyond their comfort level in terms of air humidity**. | **No-one should have to ventilate beyond their comfort level in terms of air humidity**. | ||
* Conventional ventilation designers tend to dimension the air volumes of home ventilation systems as rather high. At times, air change rates of 0.5 or even 0.8 are considered to be necessary, - especially in order to keep the indoor air humidity low in winter, thus reducing the risk of condensation and the associated mould growth. | * Conventional ventilation designers tend to dimension the air volumes of home ventilation systems as rather high. At times, air change rates of 0.5 or even 0.8 are considered to be necessary, - especially in order to keep the indoor air humidity low in winter, thus reducing the risk of condensation and the associated mould growth. | ||
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* In Passive Houses, both problems do not occur anyway, because due to the good level of thermal protection, all interior surfaces of external components are so warm that even at 60% indoor air humidity, condensation cannot occur. Therefore, the external air quantity can be decreased slightly in cold periods, particularly if indoor air humidity is felt to be too low by the occupants. **Ventilation system air changes between 0.3 and 0.4 are " | * In Passive Houses, both problems do not occur anyway, because due to the good level of thermal protection, all interior surfaces of external components are so warm that even at 60% indoor air humidity, condensation cannot occur. Therefore, the external air quantity can be decreased slightly in cold periods, particularly if indoor air humidity is felt to be too low by the occupants. **Ventilation system air changes between 0.3 and 0.4 are " | ||
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* Adjust air volumes to lower levels | * Adjust air volumes to lower levels | ||
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* Add sources of moisture in the living areas (e.g. plants) | * Add sources of moisture in the living areas (e.g. plants) | ||
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* Keep the home as dust-free as possible: clean more often using a vacuum cleaner equipped with a fine dust filter. | * Keep the home as dust-free as possible: clean more often using a vacuum cleaner equipped with a fine dust filter. | ||
planning/building_services/ventilation/basics/air_volumes.1411057157.txt.gz · Last modified: 2014/09/18 18:19 by 127.0.0.1