Heat recovery from the exhaust air in old apartment buildings. Lammon talteenotto poistoilmasta vanhoissa asuinkerrostaloissa.

In order to investigate the possibilities of installing heat recovery equipment in old apartment houses, a large project has been started. There are 30,000 to 35,000 apartment houses in Finland with an average volume of6000-7000 cu.m. Possible savings from heat recovery in houses with mechanical exhaust are the transfer of heat to supply air using standard equipment and heat recovery from exhaust air using heat pumps. Applications of the latter method depend on the heating system in the house.< The project will investigate the performance of heat recovery, air flows in individual rooms and in the whole apartment, pressure conditions and air leakage in the building, temperature in the apartments and on staircases and the opinions of the inhabitants.< Details some problems encountered with heat recovery systems and some advantages of heat recovery.