Julia van der Veen

Q&A Ventilation

What ventilation system are we using?

We are using a heat recovery ventilation system, the HRU ECO 350, which is guided by a CO2 sensor (RFT CO2 sensor).

How does a heat recovery system work?

The heat recovery machine has a warmth regulator. In this warmth regulator, the warmth of the air leaving the building is transmitted to the incoming air. This regulator has a thermal efficiency of 94%, which means only 6% of heat is lost.

We measure the quality of the air by checking the CO2 levels in ppm (parts per million). People breathe out CO2, when there are several people in a room and no fresh air is coming in, the CO2 starts building up. The sensors in the machines notice this buildup, and they will start working harder as a result. When the CO2 concentration is lowered, the machines will reduce their power automatically.

When is the CO2 level in a room too high?

A well ventilated room should have a concentration of less than 800ppm. As a maximum, the GGD has set the limit to less than 1200ppm.

How much fresh air is our goal?

We maintain 25 m3 / h pp. The CO2 levels are controlled by the sensor in the machine, which tries to keep the CO2 value around 500/600.

How much fresh air can one machine provide?

One machine can refresh a maximum of 350 m3/h of air. One m3 is 1000 liters of air. So almost 6000 liters (5833) per minute. We have therefore installed two machines in the larger rooms.