Heat recovery in natural ventilation design of office buildings.

In the EU Joule project Nat Vent one of the work packages was dealing with controlled air flow inlets. During the last conference in Greece and overview was presented on availability, performances and application of controlled air flow inlets. At the presented poster an interactive IAQ computer tool was demonstrated. This tool has been improved and is now available. Some participating countries in the Nat Vent project have carried out special tests with the NatVent IAQ tool. The NatVent participants were asked to design a natural ventilation system according to their national requirements. A second run was asked for a ventilation system which could read the 1000 ppm C02 requirement. The tests of the various countries will be shown. The results of this exercise are very interesting. It shows the positive effect of controlled inlets on IAQ in case of natural ventilation in offices.