Intelligent ventilation reacts to CO2

In the lecture theatres at Fuglesangs Allé, the ventilation system is able to sense how many students are present by measuring the amount of CO2 they breathe out. The new sensors are part of the strategy to make BSS more sustainable, and this has an effect on both the indoor climate and the electricity bill.

2012.01.19 | Anne Shirin Ørberg

It is important to have good air quality in the premises of the university, but it is far from free. Ventilation is one of the major expenses on the profit and loss account, but this also provides a potential for great savings. Since the installation of the new sensors, which react to movement and the number of people in the room, Fuglesangs Allé has saved 85,000 kWh per year. This corresponds to a reduction in CO2 emissions of 40 tonnes on a yearly basis.

Minimal waste of energy
The investment in new sensors ensures that the ventilation system is always running at the required level – no more, no less. This will result in huge savings on the electricity bill without having to compromise with the good indoor climate, says Engineer Lars Friis:

- Previously, the ventilation system was set to run at certain times every day. It was especially a problem in the exam period in which there are rarely any classes. Now the ventilation is only switched on when it can sense that people are present in the lecture theatre. If there are only a few people, it runs slowly, but if several hundred people are attending a lecture, it adjusts itself automatically.

Several sustainable initiatives
The new ventilation sensors are one of several green initiatives which have been initiated at the former ASB since the so-called 'Sustainable Campus' project was launched in September 2009. In particular, a sustainable operation of buildings can make a difference which is why Lars Friis and his colleagues continuously perform an environmental overhaul of the buildings at Fuglesangs Allé. In addition to ventilation sensors, some of the latest projects to be launched include new lighting, better utilisation of heating as well as waterless urinals, which can save 150,000 litres of water on a yearly basis.



Lars Friis

AU Finance and Planning - Facilities Management Department

Telephone: (+45) 87 15 23 73

Aarhus BSS
308561 / i40