The share of ventilation in the energy demand in Finnish building stock is about 50 per cent. An essential part of the ventilation heat losses is uncontrolled due to air infiltration, which only partly serves the demand of ventilation. The aim of improving the airtightness of windows and other leakpoints is to prevent the infiltration. But then, if the supply air intake is not mechanical, certain risks of insufficient ventilation occur. In thereport, the interconnection between the building envelope and ventilation system is studied.
The introduction describes the principle of SVP (Solar Ventilation Pre-heating) and then reviews a number of current related topics. Heat recovery is considered. Work on other devices which produce solar heated air is reviewed. The main driving forces of natural ventilation are wind pressure and thermal buoyancy. One of the problems is that the magnitude of these forces is very variable. The basis of SVP demands a thorough knowledge of airflow through buildings.
Login