Low Energy House

The current situation on the fuel market inspires the search for solutions definitely lowering the costs of building maintenance. The concept of low energy building is a solution perfectly fitting that trend. By definition, a low energy building is a building, in which the applied design and technical solutions enable its use with small energy consumption and ensure comfort in terms of hygienic and sanitary conditions.

 

The presented buildings fulfil the assumptions of energy-saving.

 

 

The structure of the building and the materials used make the external partitions meet the requirements posed for low energy buildings. Please find below a specification of heat penetration coefficients.

U [W/(m2K)] - heat penetration coefficient - External partition

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

To ensure proper hygienic conditions inside the rooms, with minimum energy consumptions, mechanical blowing-extracting ventilation with a recuperator for heat recovery. The VGS-400 Flexit air handling unit is characterized by efficiency of heat recovery at the level of 85%. The use of a recuperator allows heating fresh air blown into the rooms with the air extracted from the rooms and removed from the building. Thus, the volume of energy necessary for heating ventilation air has been significantly reduced. It leads to lowering natural gas consumption and costs of heating the building. An additional ground heat exchanger, enables preliminary heating of air in winter and cooling blown air in summer. Thanks to it, it is possible to keep temperature of some 24 – 26°C in the rooms in summer with external temperature of 30°C. The effect is close to the use of air conditioning – it lowers the temperature in summer practically without electricity consumption.

 

 

It was planned to install two sun collectors of the PE15-58 and PE20-58 types from the Projprzemeko company. The heat obtained from solar energy will be used to heat potable water. Thanks to the use of a hot water container with a capacity of 300 litres, it will be possible to collect hot water during the day and its later use during the night. In the summer and the transitory periods, most of the energy needed to heat water will be obtained from the solar installation. It will lower natural gas consumption and, consequently, lower maintenance costs.

 

 

The seasonal demand for heat for heating the whole building, calculated according to Polish Standard PN-B-02025, amounts to about 52 GJ/year. With the current price of gaseous fuel, the annual cost of heating will amount to about PLN 2 500