Energy and IAQ friendly variable ventilation rates, according with the proposed indoor air quality regulations included in the Spanish building code.

The Spanish Building Code (BC) regulates indoor air quality (IAQ) requirements in dwellings by establishing threshold continuous flow rates according to the occupancy, use of the rooms and their usable area. The implementation of this threshold flow allow adequate IAQ.
A revised IAQ requirement have been proposed. These new requirement quantifies the IAQ as a function of CO2 concentration which means an non continuous flow rates ventilation systems will be able to be used.
In order to reduce the global ventilation rate and save energy related to heating and cooling, research have been conducted to obtain nom continuous flow rates that full fill propose IAQ requirement for some case studies. In addition to this CO2 concentration has been using the continuous ventilation rates including in the current IAQ regulations.
This research has been developed using the CONTAM simulation tool, BD proposed hypothesis and owns hypothesis too. Results show different non continues ventilation rates which are friendly with energy saving and the proposed IAQ levels.