Details on "Domestic Ventilation Project"
Information on the area Domestic Ventilation Project of the Ventilation module in LINEAR Building.
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Building Data
Building Data
Opens the dialog in which you make settings for the building, for example the building type, the building geometry or the ventilation zone. You can apply a ventilation concept only to residential buildings.
Location, Position
Location
Determines the place where the building is located. For each location, it is stored whether it is located in a windy or a low-windy region. This setting affects the airflow rate of infiltration through the building envelope. Clicking Select Location opens the dialog where you select another location. Set the location here, even if you have already selected a location during a heat load calculation.
Wind Data using Location Selection
Enabled: Includes the wind data stored for the selected location in the calculation.
Disabled: Allows manual selection of windy or not windy.
Ventilation zone: […]
Opens the Building Data dialog where you can define the level of the ventilation zone.
Heat Protection of Building Envelope
Heat Protection of Building Envelope
Determines the heat protection of the building envelope.
New buildings are generally better insulated than existing buildings. Improved insulation always leads to increased ventilation requirements for humidity control. New buildings or modernized buildings with a thermal insulation standard after 1995 are assumed to have high thermal insulation. Low thermal insulation is assumed for buildings constructed before 1995.
High occupancy means that the effective floor area is less than 40 m2/person when the building is used as planned. If the number of persons is unknown, high occupancy is assumed.
Increased Requirements
As soon as increased requirements are placed on sound insulation, indoor air quality or energy efficiency, a ventilation measure is required. When selecting the ventilation system, the program issues a message in the log indicating whether the requirements are met or not. The ventilation system is marked accordingly in the printout.
Ventilation Systems according to DIN 18017-3
The air volumes for interior/windowless rooms are determined in accordance with DIN 18017-3. The option Additional Dimensioning According to DIN 1946-6 makes it possible to include the areas and volume flow rates of windowless rooms in the calculation according to DIN 1946-6. Depending on the proportion of windowless rooms, the total volume flow rate of the ventilation zone can increase or decrease.
If the option Dimensioning according to DIN 1946-6 is enabled and the setting for the maximum extract air volume flow of the ventilation system is set to According to DIN 18017-3, the minimum volume flow in the room results from the maximum of the extract air volume flow according to DIN 18017-3 and the extract air volume flow according to table 16 for mechanical nominal ventilation. Otherwise, the minimum volume flow in the room is the maximum of the exhaust air volume flow according to table 16 for mechanical nominal ventilation and the value entered by the user.
If the option Dimensioning according to DIN 1946-6 is disabled and the setting for the maximum extract air volume flow of the ventilation system is set to According to DIN 18017-3, the maximum volume flow according to DIN 18017-3 is used. Otherwise, the minimum volume flow rate is the maximum of the volume flow rate according to DIN 18017-3 and a volume flow rate that is determined in two different ways.
- If there are rooms of the room type WC, utility room and bathroom in the project, these rooms are counted. Bathrooms will be multiplied by a factor of 2. The maximum extract air volume flow rate entered by the user is then divided by this determined number. Depending on the type of room under consideration, the determined volume flow rate is either used directly (WCs and utility rooms) or multiplied by a factor of 2 beforehand (bathrooms).
- If there are no rooms of these room types in the project, the maximum extract air volume flow rate entered by the user is used directly.
If necessary, select Cross Ventilation as the general Ventilation Concept for the zone in the ventilation zone overview and assign Ventilation as the Ventilation Concept for at least one room in the zone. DIN 18017-3 with a single or central fan to activate the options for the minimum and maximum extract air volume flow rate of the ventilation system. Then click on the 
button and select Custom to be able to enter values for the exhaust air volume flow rates.
Design of Cross Ventilation
Enable this setting if there is a significant height difference between leakage and outdoor component air diffusers. This setting affects infiltration regarding the cross-ventilation.
Infiltration through the Building Envelope
Infiltration through the building envelope is calculated according to DIN 1946-6 from the air volume of the ventilation zone, the air exchange rate at 50 Pa differential pressure across the building envelope, and a volume flow coefficient that depends on the ventilation measure selected.
Wind protection/Shielding
For the calculation of infiltration through the building envelope for cross-ventilation and shaft ventilation, the correction factor fLocation is taken into account depending on the wind protection. The more wind-shielded a building is, the lower the infiltration.
Measured air exchange rate values available
Allows manual entry of values for air exchange and pressure exponents.
| Category | Air change 1/h |
|---|---|
| Category A: Mechanical ventilation | 1.0 |
| Category B: Natural ventilation, for buildings built from 2002 | 1.5 |
| Category B: Natural ventilation, modernization, one storey ventilation zone (e.g. multi-family house) | 1.5 |
| Category C: natural ventilation, modernization, multi-storey ventilation zonbe (e.g. single-family house), built before 2002 | 2.0 |
Air exchange (n50)
Indicates the air exchange rate measured during the air tightness test at a differential pressure of 50 Pa (“blower door test”).
Pressure exponent
Specifies the pressure exponent. The pressure exponent is either specified with n=2/3 or you enter the measured value.
Calculation of infiltration volume flow rate
Specifies whether the correction factor for the height of the ventilation zone above ground is determined based on the height of the building or the height of the respective ventilation zone in the case of cross and shaft ventilation. For example, if you’re dealing with a tall building and you determine the infiltration air volume based on the height of the building, all ventilation zones will have a higher infiltration air volume than when determined based on the height of each ventilation zone.
Design Options for Ventilation Systems
Dimension for the superior operating stage
Lay out the ventilation system one operating level higher than required by the standard. Example: If fan-assisted ventilation is selected, the ventilation system is designed according to nominal ventilation (NV) by default. If you enable the option Dimension for Superior Operating Stage, the fan-assisted ventilation is layed out according to intensive ventilation (IV). You cannot set a higher operating level for shaft ventilation.
| Operating level | Description |
|---|---|
| HCV - Ventilation necessary for humidity control | Corresponds to 30% - 40% of the volume flow of nominal ventilation. Ventilation depending on the thermal insulation level and the occupancy of the building to ensure building protection (humidity control) under normal conditions of use with partially reduced humidity loads (e.g. temporary absence of users, no drying of laundry). According to the standard, this level must be ensured constantly and independently of the user. |
| RV - Reduced ventilation | Corresponds to 70% of the volume flow of the nominal ventilation. Additional ventilation necessary to ensure the minimum hygienic standard (pollutant load) and building protection during temporary absence of the user. This level must be ensured as far as possible independent of the user. |
| NV - Nominal ventilation | Corresponds to 100% of the volume flow. Describes the necessary ventilation to ensure hygienic and health requirements as well as building protection during normal use of the housing. The user can be partially involved for active window ventilation for this purpose. |
| IV - Intensive ventilation | Corresponds to 130% of the volume flow of the nominal ventilation. Serves to reduce peak loads caused, for example, by cooking and washing. The user can also be partially involved here with active window ventilation. |
Info
Opens a diagram with the systems and operating levels of the domestic ventilation. In this diagram you can see that you have a choice between free, fan-assisted and combined ventilation. For all ventilation types, several ventilation systems are available for selection.
The design of a ventilation system is usually based on the highest possible operating level. If you want to set a higher operating level, the operating level in brackets is used. The lower operating levels are automatically included and are therefore listed in the diagram. An exception is cross ventilation (humidity control), which can only be designed according to reduced ventilation (RV).
Intensive ventilation (IV) can be achieved in all ventilation systems by means of window ventilation by the user. According to DIN 1946-6, manual window ventilation is only possible and necessary when users are present. Therefore, the outdoor air flow rate due to window ventilation qv,Fe,Wirk is not used for the design of ventilation measures.
Default Setting
Determines whether ventilation is centralized or decentralized. When selecting Standard: Centralized, a fan supplies all rooms with the required air volume flows via ducts. When selecting Standard: Decentralized fans generate the air volume flows in the room.
The ventilation settings according to the German heat load and from the ventilation concept are automatically synchronized.