Abstract
The paper describes the method for the determination and evaluation of thermal insulation properties of various types of windows made from pine wood. The method has been used for a simple and a double window that are parts of a log house in the Czech Republic. Both windows are located in one room. The method for the evaluation of thermal insulation properties consists in determining the boundary conditions of the frame and sash temperature from the interior and exterior. Additionally, the temperature of the window surroundings was measured, at the building envelope. The boundary conditions were measured by different sensors to ensure an accurate setting of the thermographic camera. Based on the values determined, the method calculates the heat transfer coefficient and the temperature factor of the internal surface. Then, the thermal insulation properties of integrated windows can be determined and compared. The priority of this measurement was a basic comparison of thermal insulation properties of two different types of windows located in a log house. This measurement will serve as the basis for a comparison of thermal insulation properties of the same types of windows in different log houses located in regions with different weather conditions. After a comprehensive comparison, based on the results, the right type of window can be recommended with respect to the location of the log house in question.
Highlights
The thermal insulation properties of integrated windows can be determined and compared. The priority of this measurement was a basic comparison of thermal insulation properties of two different types of windows located in a log house
The measured values show that the double window has significantly better thermal insulation properties than the simple window
Windows are the weakest spot of each building envelope from the perspective of thermal insulation properties and the economic performance of log houses
Summary
A window is an important part of the building external envelope, primarily providing daylight and natural ventilation for the interiors and meeting basic health requirements for living spaces (Motyková, 2008). Given the current energy cost increase, house owners wish to improve the energy performance of their houses. As early as when designing the house and its technical facilities, the climatic conditions of the house location should be taken into account. Disregarding this aspect may lead to significantly increased costs of the house operation. Heat loss through windows is among the largest ones; windows usually represent approximately 30 to 50 percent of the heat loss through the building envelope (Gustavsen, 2011). The greatest attention should be paid to window selection, not just from the aesthetic perspective, but mainly with respect to its thermal insulation properties
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