Energy-efficient houses are being built in European countries for a long time, but for our country, such a dwelling is still exotic.
It is not surprising that many developers are suspicious of the construction of such buildings, considering it an unjustified waste of money.
An energy-efficient (energy-passive) house is a structure in which the costs associated with energy consumption are, on average, 30% less than in an ordinary house. Energy efficiency at home until recently could be determined by the coefficient of seasonal use of thermal energy – E.
E <= 110 kWh / m2 / year is a normal house.
E <= 70 kWh / m2 / year – energy efficient house.
E <= 15 kWh / m2 / year – passive house.
When calculating the coefficient E, the ratio of the area of all external surfaces to the total cubic capacity of the house, the thickness of the thermal insulation layer in the walls, the roof and the floors of the house, the glazing area and the number of people living in the building are taken into account.
In Europe, to determine the energy efficiency class of the house, the EP coefficient is used, which determines the amount of electricity spent for heating, hot water, lighting, ventilation and the operation of household electrical appliances.
The starting point is taken by EP = 1 and the energy class D, i.e. standard. The modern classification of houses, adopted in European countries, looks like this:
ЕР <= 0,25 – class A, passive house;
0.26 <EP <= 0.50 – class B, economical house;
0,51 <ЕР <= 0,75 – class C, energy-saving house;
0.75 <EP <= 1 – class D, standard house;
1,01 <EP <= 1.25 – class E;
1.26 <EP <= 1.50 – class F;
ЕР> 1,51 – class G, the most energy-consuming house.
In an ordinary, not sufficiently insulated, house with large heat losses through the enclosing structures, most of the energy (up to 70%) goes to heating.
You can say that the owners of this house heat the street.
Therefore, in European countries, no one is surprised at the thickness of the insulation in the walls of 300-400 mm, and the contour of the building itself is made airtight.
But before buying cubic meters of insulation, it is necessary to understand when additional insulation and the whole complex of measures related to the construction of an energy efficient house are economically justified.
Energy efficiency in figures
In northern Canada, the heating season lasts for an average of 7-8 months, and the climate is more severe than in Europe. Because of this, a lot of controversy arises about whether it is profitable to build an energy-efficient house in our country? One of the most frequent statements of opponents of energy-efficient construction is the argument that in our country the construction of such a house is very expensive, and the cost of its erection will never pay off. Is it really?