A detailed analysis of the influence of a glazed surface type with a diversified thermal transmittance on the energy balance of a detached house boasting the volume of 445.10 m3, was carried out on the basis of the Passive House Planning Program (PHPP). Average monthly transmission heat losses and solar gains by windows with five different U-Values were determined. A part of heat losses by windows in the total building energy balance was compared. It was pointed out, that the use of windows with thermal transmittance equals 0.80 W/(m2×K) enables to reduce transmission heat losses by 34% and to decrease the energy need for heating by circa 18% in comparison with the windows with thermal transmittance equals 1.20 W/(m2×K). The annual primary energy demand in this building was reduced by 2.9%. For all analyzed cases, the use of external solar shading devices contributes to reduction of the transmission heat losses and the energy demand ratio for the heating system. The solar control devices allowed to decrease of solar heat gains at the average by 41.3% during the months from May to September. The application of energy-saving windows with external solar shading devices influenced the increase of the building energy efficiency.
W okresie zimowym zyski ciepła z tytułu nasłonecznienia wspomagają system ogrzewania budynku, natomiast w okresie letnim muszą być ograniczane. Wielkością mającą wpływ na podatność pomieszczeń na przegrzewanie jest pojemność cieplna. W artykule przedłożono informacje m.in. o ochronie przed nadmiernym nasłonecznieniem, wykorzystywaniu zysków ciepła, czynnikach wpływających na wielkość zysków ciepła.
EN
In winter, heat gains due to sunlight support the heating system of a building, while in summer they must be limited. Heat capacity is a quantity influencing the vulnerability of the rooms to overheating. The article presents information amongst others on the protection against excessive insulation, use of heat gains and factors affecting the level of heat gains.
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