Coefficient E depends on several factors. First of all, the thermal insulation and outer surfaces of all the bulkheads (walls, windows, doors, roof, ground floor). The system is used ventilation air (gravity, mechanical heat recovery, air conditioning), the heat gains from solar radiation, which is the proper positioning of the building against the world, as well as heat gains from domestic waste water (mainly the number of people living in the house and the type of devices that emit heat) .
Of course, each factor must be a punk references. In this case the limit values are determined by the rate seasonal heat demand for heating E0 [kWh / m² a year or kWh / m³ year].
It describes the amount of heat needed to vaporize a unit area or volume of a building on the assumption that all provisions are met and construction standards (eg, heat transfer coefficient of external partitions U = 0.3 W / m² K, and wooden window U = 2,0 or 2 , 6 W / m² K, etc.).
E0 size index is calculated on the basis of the aspect ratio of the building expressed the ratio of A / V (where A – is the total area of the external bulkheads of the heated part of the building, V – is part of the heated air space in the building).
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