Demand controlled ventilation (DCV) is one of the most systems used in the installations in Swedish buildings.
Demand controlled ventilation (DCV) = ventilation based on the actual need – driven by temperature, CO2, mixed gas, etc
Good indoor environment pays off:
- Even as little as only 1% increase in performance may correspond to the annual cost needed for ventilation of an office building.
- Productivity improvements just under 10% may correspond to the total installation and operating costs of an office building.
- The payback period for investment in improved indoor environment quality is often less than 2 years.
The need to control in Sweden:
- Average heating consumption in Swedish schools: 143 kWh/m2 per year
- Heating consumption in DCV systems in the corresponding buildings: ca 60 kWh/m2 per year
- Total area for schools in Sweden: 30 800 000 m2
Pitfalls and errors:
- In our zeal to save energy, there is a risk that we are sabotaging indoor climate.
- “Overkill” (over-dimensioning of HVAC components and system) when calculating the heating and cooling effects
- Wrong system selection, which causes noise and draft problems
- Do not try to save on the maintenance and repair
Source: Conny Nilsson´s presentation about Energy-efficient ventilation