Details on Ventilation
Information on the Ventilation section of the Heat Load module at room level.
You are here:
Ventilation system
Drop-down list for selecting the installed ventilation system.
If there is a ventilation system in the room, the supply air volume flow rate must always be heated when the supply air temperature is below the room temperature.
If the ventilation system is used to cover the heat load (or part of it) of the room, this proportion must not be taken into account in the heat load calculation for the room. In this case the supply air temperature will be adjusted to the actual value.
The type of ventilation system is usually taken from the general heat load data. In this case, From project setting is displayed in front of the name of the ventilation system. If the ventilation system in the room should deviate from the project setting, select a different system. Depending on the ventilation system selected, fields that do not apply are deactivated.
Air change rate: Enter the air change rate. The supply air and extract air volume flow are then calculated. If you change supply air or extract air volume flow, the air change rate is adjusted accordingly based on the larger volume flow rate.
Supply air flow rate: Quantity of air that flows into the room via the ventilation system. If you have also specified the extract air volume flow rate, the air change rate is calculated based on the larger volume flow rate. Clicking on 
to open a context menu in which you can choose between the options Reset to value from CAD and Reset to calculated value. Click on Reset to value from CAD to enter the value that was determined when the building was entered from CAD.. Click on Reset to Calculated Value to enter the value determined according to the standard. If you have selected system B or system D as the ventilation system, the minimum volume flow is entered here.
Extract air flow rate: Quantity of air that is discharged from the room via the ventilation system. If you have also specified the supply air volume flow rate, the air change rate is calculated based on the larger volume flow rate. Clicking on to open a context menu in which you can choose between the options Reset to value from CAD and Reset to calculated value. Click on Reset to value from CAD to enter the value that was determined when the building was entered from CAD.. Click on Reset to Calculated Value to enter the value determined according to the standard. If you have selected system C as the ventilation system, the minimum volume flow rate is entered here and divided 50% each between the air volume flow q_V,e coming from outside and the air volume flow q_V,ji coming from other rooms.
Supply air temperature: The supply air temperature is suggested as follows, depending on the type of ventilation system:
In supply and exhaust air systems, the supply air temperature is determined with the heat recovery rate.
For pure supply air systems, the outdoor temperature is taken from the general heat load data as supply air temperature. The supply air temperature can also be freely entered, the value then appears in bold. Clicking on to open a context menu in which you can choose between the options Reset to value from CAD and Reset to calculated value. Click on Reset to value from CAD to enter the value that was determined when the building was entered from CAD.. Click on Reset to Calculated Value to enter the value determined according to the standard.
Room area: The room area is automatically adopted from the general room data and displayed here.
Supply air volume flow rate by overflow or infiltration
Volume flow rate q_i: The calculated infiltration volume flow is entered here. This volume flow is not part of the air balance.
Supply air temperature q_i: The temperature of the infiltration volume flow rate. This temperature corresponds to the outside temperature.
Volume flow rate q_V,e: The air flowing in from outside to ensure the minimum air change rate. If you have selected System A as the ventilation system, the maximum volume flow from the calculation method of the module Ventilation is entered here. If you have selected System C as the ventilation system, 50% of the manually set exhaust air volume flow is entered here. The value can be adjusted manually. Clicking on to open a context menu in which you can choose between the options Reset to value from CAD and Reset to calculated value. Click on Reset to value from CAD to enter the value that was determined when the building was entered from CAD. Click on Reset to Calculated Value to enter the value determined according to the standard.
Supply air temperature q_V,e: The temperature of the air coming in from outside. This temperature corresponds to the outside temperature.
Volume flow rate q_v,ji: Volume flow rate which flows from the inside of one or more adjacent rooms must be entered manually. The proposed volume flow rate is the difference between the exhaust and supply air, if the difference is greater than 0. If you have selected System C as the ventilation system, 50% of the manually set exhaust air volume flow is entered here. The value can be overwritten with a manual entry. Clicking on to open a context menu in which you can choose between the options Reset to value from CAD and Reset to calculated value. Click on Reset to value from CAD to enter the value that was determined when the building was entered from CAD. Click on Reset to Calculated Value to enter the value determined according to the standard.
Supply air temperature q_v,ji: The average temperature of the air flowing in from adjoining rooms must be entered manually.
Volume flow rate q_V,ij: Volume flow rate that flows out of the room. This value is not included in the calculation of ventilation heat losses. The volume flow rate is calculated from the difference between supply and extract air, if the difference is greater than 0.
Supply air temperature q_V,ij: Average temperature of the air flowing out of the room. The value corresponds to the standard inside temperature of the room.