Method of calculating the season heat requirements for ventilation purposes in residential buildings.

Heat requirements of ventilation systems are becoming a dominant factor to be considered in energy balances prepared for residential buildings. This results from a consistent improvement of thermal insulating power and better tightness of partitions, as well as from the standards that ventilation systems have to meet in relation to the quality of the indoor air. This factor despite variable volumes of the air exchanged with the external environment, is not always considered in most estimates of thermal power quantities. The assessment of seasonal heat demands which provides grounds for the selection of the components and quantities of heat sources, often does not account for the thermal power requirements needed for ventilation, which may lead to considerable discrepancies in relation to actual heat quantities. The discussed method of estimating mean multi-annual thermal energy consumption by ventilation systems, is based on relating the changed air multiple to the outdoor temperature.