Modern Concepts for Refurbishment of Ventilation and Air- Conditioning Systems

A research project has been carried out to develop new methods and technical solutions torefurbish ventilation and air-conditioning systems of office and commercial buildings builtduring 1970`and 1980`. More than twenty refurbishment concepts have been developed,which deal with all parts of ventilation and air-conditioning system (air-intake, filtering,cleaning, tightening and balancing of ductwork, noise control, air distribution, demand basedventilation, night cooling, adding mechanical cooling etc) and which can be carried out oneby one or all together depending of the actual needs. Special attention has been paid for theinstallation work on site to minimize the disturbance and nuisance to users of the building.Therefore dustless and noiseless installation methods have been developed. For each conceptsdesign criterias and installation rules are given. Finally the commissioning procedure for eachconcept has been discribed. This project has been carried out in Finland, where buildingowners, manfacturers, contractors and designers have been working together with researchesto achieve means to refurbish old buildings to meet todays reguirements of modern indoor airclimate.