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Air renewal

Different ventilation systems for my eco-friendly house

Different kind of ventilation are available in order to reach a correct air renewal and to insure a good indoor air quality in our ecological house. 

The following table shows the benefits and disadvantages of different kind of ventilation system. 

How it works

  • Low and high ventilation grids in wet rooms (kitchen, bathroom).

Disadvantages

  • Does not allow all the dwelling to be ventilated and allows cold air to enter in winter and little air in summer.
  • There are no ventilation in the other rooms.
  • Random and subject to climatic contingencies.
  • Little control over winter flows and energy losses.

Benefits

  • No costs involved

How it works

  • Opening of the windows by the tenants

Disadvantages

  • Random, uncertain, risky

How it works

  • Turbine in the bathrooms that extract air directly to the outside.
  • Direct extraction hoods to the outside in kitchens.

Disadvantages

  • Noisy
  • No air change in all rooms
  • No flow regulation
  • Not automatic

How it works

  • Centralized turbine that extracts water vapor-charged air from humid rooms (bathroom, kitchen, etc.) via ducts. 
  • Air intakes via strips on the external frames or air vents in the main rooms. 
  • Fresh air circulates in the house through the spaces left under the doors: important when installing flooring. 
  • The used air is evacuated through exhaust vents located near the ceiling and then through the chimney.

Disadvantages

  • Extracts hot air is lost because is expulsed to the outside 
  • Does not take into account indoor humidity.

Benefits

  • Constant incoming air flow rate.

How it works

  • Analyzes the water content of the ambient air continuously extracted and adapts the volumes to the real needs of regulating its relative humidity.

Disadvantages

  • High skilled maintenance

Benefits

  • Variable exhaust air flow rate as a function of humidity and therefore occupancy and activities.

How it works

  • Analysis of the humidity of the incoming air.
  • The strips are humidity sensitive, i. e. they adapt the size of their openings according to the water content of the incoming air.

Disadvantages

  • Likely to limit too much the incoming flow so the air is not renewed enough. 

Benefits

  • Variable exhaust air flow rate as a function of humidity and therefore occupancy and activities

How it works

  • Extraction of saturated air from wet rooms and supply air via strips on frames or vents in the walls/doors of dry rooms.
  • Individual extraction per wet room.

Disadvantages

  • Quite noisy
  • Extraction unit in each operating part (space and aesthetics)

Benefits

  • Savings because there are no ducts.
  • Good for renovation

How it works

  • The extracted air passes through a heat exchanger which recovers the calories and preheats the air blown in through them. 
  • Circuit 1 blows fresh air into the main rooms > outside air is filtered, preheated at a heat exchanger and blown into the main rooms by a fan through air inlets. 
  • Circuit 2 recovers used air in the operating rooms > air is sucked in and filtered. Its heat is recovered at the exchanger and transmitted to the fresh air circuit. Exhaust air is discharged to the outside. 
  • Condensate drainage must be managed carefull

Disadvantages

  • More expensive than unidirectionnal CMV because it consumes more electricity but saves heating costs because it recovers 70% of the heat contained in the extracted used air (even 90%). 
  • Recommended for the coldest climate zones
  • If incorrect installation, noise of the insufflation openings
  • More suitable for new construction than renovation

Benefits

  • Energy saving through calorie recovery
  • Filtration of incoming air
  • Sensation of cold air flow suppressed
  • Preheating or cooling of incoming air

How it works

  • A single machine receives all the extracted air for preheating.
  • Consisting of an extract air turbine, a supply air turbine, an exchanger and filters.
  • Many ducts to supply air into dry rooms.  

Disadvantages

  • Difficult installation for an old house
  • Requires a very high wind tightness
  • Need to maintain it rigorously (cleaning every 2 or 3 years and changing filters at least twice a year)

How it works

  • Coupled with a Heat Pump.

How it works

  • Small individual units with an air flow circulating through a cartridge for about 70 to 80 seconds in one direction and then by reversing in the opposite direction. 
  • The calories from the outgoing hot air are captured by the cartridge and released by the same cartridge to the ambient air.

Disadvantages

  • A bit noisy

Benefits

  • It required just a few ducts.
  • Easier to install in an old house

How it works

  • The insufflation is done in dry rooms in order to avoid distributing moisture throughout the home.

Disadvantages

  • Necessary to properly maintain the ducts

Benefits

  • Easier filtration of the supply air. 
  • Limits radon infiltration into homes on underground sites

It is necessary to properly renew the air in a dwelling. This will have a positive impact on the health of the occupants. On the other hand, a good ventilation will ensure the durability of the housing.