Trial implementations of hybrid ventilation principles in dwelling buildings

The paper is devoted to the trial implementation of two different types of hybrid ventilation systems in dwelling buildings done in the scope of the EU LIFE Programme supported project ECOVENT.Recent changes in Latvian Building Codes require higher thermal resistance of buildingstructures, air tight windows and mandatory ventilation systems. Use of mechanical ventilationsystems may reduce the positive effect of improvements of thermal performance of buildingstructures by 30-40% of the achieved economy. The possible solution in order to prevent thenegative effect of mechanical ventilation system installation is introduction in Latvia hybridventilation systems.The paper explores theoretical working modes of the ventilation systems, describes advantages and shortcomings of the ventilation systems selected for the trial implementation in Latvian climate conditions.