Demand Controlled Ventilation

How to Maximize Energy savings, while maintaining Indoor Air Quality? Demand Controlled Ventilation based on CO2 measurement.

A school with OptoSense CO2 sensors may save up to 200 €/year per classroom, while maintaining excellent indoor climate for well-being and productive learning.

A good indoor environment for learning

The UN Climate Panel calculated that 40-50% of world energy is used in buildings. EU research showed that an astounding 30-45 MT of CO2/year could be saved, leading to adoption of the EU Directive on Energy Efficient Buildings. As HVAC represent 40-65% of energy usage in commercial and public buildings, the industry is challenged to balance between comfort and energy saving under all conditions.

An important answer is Demand Controlled Ventilation (DCV) with CO2 sensors.

CO2 sensors measure the level of occupancy as all humans exhale 4-5% CO2 in each breath and 700-900 ppm CO2with normal temperature constitutes excellent Indoor Air Quality.

DCV yield the greatest energy savings in buildings with low predictability and large variations in occupancy. New demands on energy efficiency leads to masures like more airtight buildings and ventilation being completely turned off at nights. This makes calibration against a background CO2 level less and less relevant. DCV with CO2 sensors should also be deployed in buildings with 24/7 occupation.

Some examples:

  • Sports facilities have extreme fluctuation in usage; i.e. swimming pools have the single highest energy/m2 usage in the public sector.
  • Shoppers expect convenient hours and comfortable environment; 24/7 superstores have the highest energy-intensity in retail.
  • Care wards, clean rooms etc need high accuracy.
  • Hotels require a guaranteed comfort level also in periods with late-hour usage of conferencing and dining facilities.
  • Train stations and airports experience extreme rush hour variations and overcrowding due to severe delays.
  • Hospitals, support centres and prisons never empty.

To provide real value the sensors must report accurate and stable measurements day-by-day, year-by-year throughout the buildings lifespan. Sensors should be installed in any kind of building without special setup parameters or calibration routines.

OptoSense provides the only sensor in the market that does an absolute and independent measurement of CO2 contents every second throughout the lifetime.