Passipedia EN

User Tools

Site Tools

You are here: Passipedia - The Passive House Resource » Planning and Construction » Building Services » Ventilation » Basics » Types of ventilation
planning:building_services:ventilation:basics:types_of_ventilation

Differences

This shows you the differences between two versions of the page.

Link to this comparison view

Both sides previous revisionPrevious revision
Next revision		Previous revision
planning:building_services:ventilation:basics:types_of_ventilation [2019/02/21 12:53] – cblagojevicplanning:building_services:ventilation:basics:types_of_ventilation [2023/06/06 11:40] (current) – yaling.hsiao@passiv.de
Line 3: Line 3:
 For occupants, the most important planning aspects are health and comfort. Excellent air quality is especially essential and can only be achieved if "used" air is regularly replaced by fresh air. Opening windows twice a day is not enough (see [[[planning:building services:Ventilation:Basics:Types of ventilation#Purge ventilation through windows]]). Comfort ventilation based on the requirements for fresh air is therefore indispensable in every [[basics:what_is_a_passive_house|Passive House]]. A regular, guaranteed and adequate exchange of air in winter is only possible by means of comfort ventilation –  this also applies for ordinary new buildings. The issue here is not energy efficiency, but the health of the building's occupants; Indoor Air Quality (IAQ) has a much higher priority than energy conservation - but it turns out that there is no conflict at all, if efficient components are used. For occupants, the most important planning aspects are health and comfort. Excellent air quality is especially essential and can only be achieved if "used" air is regularly replaced by fresh air. Opening windows twice a day is not enough (see [[[planning:building services:Ventilation:Basics:Types of ventilation#Purge ventilation through windows]]). Comfort ventilation based on the requirements for fresh air is therefore indispensable in every [[basics:what_is_a_passive_house|Passive House]]. A regular, guaranteed and adequate exchange of air in winter is only possible by means of comfort ventilation –  this also applies for ordinary new buildings. The issue here is not energy efficiency, but the health of the building's occupants; Indoor Air Quality (IAQ) has a much higher priority than energy conservation - but it turns out that there is no conflict at all, if efficient components are used.
  
-===== Gap ventilation =====+===== Ventilation through leaks in the building envelope =====
  
 Gap ventilation through leaks is not adequate in the heating period at all (see also [[Planning:Airtight construction]]): \\ Gap ventilation through leaks is not adequate in the heating period at all (see also [[Planning:Airtight construction]]): \\
Line 117: Line 117:
  
 Ventilation can also take place if a simple exhaust air system and external air inlets are used.  The external air inlets let fresh (cold) air in the required amounts into the rooms.  However, for the Passive House the ventilation heat losses that would be caused by the disposal of the unused extract air would be much too high.  It would only be possible to adjust the energy balance with a high heating output. Ventilation can also take place if a simple exhaust air system and external air inlets are used.  The external air inlets let fresh (cold) air in the required amounts into the rooms.  However, for the Passive House the ventilation heat losses that would be caused by the disposal of the unused extract air would be much too high.  It would only be possible to adjust the energy balance with a high heating output.
 +
 +===== Heat Recovery with a Counterflow Heat Exchanger =====
  
 **In Central Europe, Passive Houses only work if a highly efficient heat recovery system is also present**  This recovers the heat from the exhaust air and using a heat exchanger, transfers it back into the supply air without mixing the air flows. Today, modern ventilation technology allows a heat recovery rate of  between 75 and 95 %. This is possible due to counterflow heat exchangers and special energy-efficient fans (with so-called EC motors with a particularly high effectiveness), so that the recovered heat is 8 to 15 times the electricity consumed.\\ **In Central Europe, Passive Houses only work if a highly efficient heat recovery system is also present**  This recovers the heat from the exhaust air and using a heat exchanger, transfers it back into the supply air without mixing the air flows. Today, modern ventilation technology allows a heat recovery rate of  between 75 and 95 %. This is possible due to counterflow heat exchangers and special energy-efficient fans (with so-called EC motors with a particularly high effectiveness), so that the recovered heat is 8 to 15 times the electricity consumed.\\
Line 145: Line 147:
 ===== Conclusion ===== ===== Conclusion =====
  
-Passive Houses always have an integrated home ventilation system with heat recovery, and often this is the central component of the complete building services. Only high quality ventilation technology is suitable for the Passive House. The Passive House Institute has [[http://www.passiv.de/03_zer/Komp/Lueft/Lueft_F.htm|summarised these (in German) in the requirements for central ventilation units]]: Apart from a high heat recovery rate, low electricity consumption, and hygienically faultless and very quiet operation must be guaranteed.\\+Passive Houses always have an integrated home ventilation system with heat recovery, and often this is the central component of the complete building services. Only high quality ventilation technology is suitable for the Passive House. The Passive House Institute has [[https://passivehouse.com/03_certification/01_certification_components/02_certification_criteria/02_certification_criteria.htm |summarised these (in German) in the requirements for central ventilation units]]: Apart from a high heat recovery rate, low electricity consumption, and hygienically faultless and very quiet operation must be guaranteed.\\
 \\  \\ 
 ===== Literature ===== ===== Literature =====
planning/building_services/ventilation/basics/types_of_ventilation.1550750025.txt.gz · Last modified: 2019/02/21 12:53 by cblagojevic