Heat pumps for domestic ventilation systems. Luftungswarmepumpe for Wohngebaude.

Improved levels of thermal insulation for dwellings in W.Germany have substantially reduced thermal transmission losses, so that ventilation heat loss has become much more important component of total building heat demand. Amount of heat appears important enough to justify considering heat recovery from ventilation air residential buildings. Describes 3 examples of exhaust air recovery from flats in an apartment building. Provides details of air change rates. Summarises basic data on ventilation and heat gains and losses for apartment with window ventilation and with 2 heat pump recovery systems.