Low – Energy Houses
Low – Energy Houses
Energy-efficient houses will be standard in Polish construction in a few years. All housesbuilt in Poland will have to have this feature after 2020. Energy-efficient buildings are characterized by a heating demand of 30-70 kWh / m² at least. They use 5 heating oil liters per m2 of the heated area a year- just to cover heat losses.The cost of building an energy efficient building is more than 10% higher than the reference building – consuming about 120 kWh of energy per m2 of the usable area per year.
- Houses outside the energy efficiency class – above 70 kWh /m²/ year
- Energy-efficient home – 40 kWh /m²/ year
- Passive house – 15 kWh /m²/ year
The energy efficient house is characterized by good insulation of the external partitions, including window and door joinery, high-performance mechanical ventilation system with heat recovery, high-efficiency heating system and reduced thermal bridges. Such a building itself contributes to the reduction of carbon dioxide emissions into the atmosphere and uses a large percentage of renewable energy, e.g. wind, solar, biomass, heat pumps (geological heat). It uses as little energy as possible for daily operation. Comprehensive implementation of appropriate measures to reduce the loss of heat guarantees high quality of energy balance.
Source of heat
Heat sources in energy-efficient houses are usually high efficiency appliances, such as condensing boilers or heat pumps, powered by free solar energy.Heaters should have the smallest possible water capacity and the pipes should be well insulated. It is recommended to use mechanical ventilation of ventilation and extract air with heat recovery. Both energy-efficient and passive buildings must be airtight. The fresh air is only vented through the ventilation system.
Average heat transfer coefficient
The average heat transfer coefficient U of the outer partitions in the energy-efficient building does not exceed 0.2 W / (sq.m. K). Achieving these parameters is possible thanks to the use of thicknesses of min. 20 cm, and in the roof or ceiling – 30 cm. In comparison, the brick house is warmed by standard Styrofoam 10-12cm thick. The heat transfer coefficient for a standard 20cm wool wall is U = 0.19 W / m² * K. The standard for warm houses is when the coefficient does not exceed U = 0.3 W / m² * K.
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11-100 Lidzbark Warminski, Poland