Development and optimizing of an energy efficient 'straightner' ventilation aggregate with an integrated 'chopper' heat exchanger

More explicitly the purpose is to develop a ventilation aggregate (incl. duct system) at the same market price, as a traditional aggregate, with a SEL factor of approx 1000 [J/m3 and a heat recovery unit with a thermal etavgv of approx 90%. Furhtermore the project will focus on the development of system solutions for duct system integrated in the building with the following objective: Minimal heat loss and low price. The problem of rime frost formation is evaluated in relation to defrosting or preheating of fresh air in ground duct. New proposal, based on variable bypassing of heat exchangers on the intake side in order just to avoid frost formation, is being examined. Analysis of energy savings through different construction designs and control of these - for instance variable flow optimized in relation to humidity and time. Essential effects will be: 1) Attractive energy- and CO2 accounts. 2) Greater guarantee that BR's ventilation demands are met throughout the whole year. 3). A good mixing of the fresh air in the room.