Sound insulation of PVC windows at negative outdoor temperatures

The PVC windows using experience in the climatic conditions of the Russian Federation shows that their profile elements are subject to temperature deformations under the influence of the temperature gradient of outdoor air and indoor air. This physical phenomenon is observed both in the summer and winter operation period. In this article we study the influence of external air negative temperatures into the sound insulation of PVC windows. The research was performed on a standard PVC window in a climate chamber with acoustic equipment. The PVC window sound insulation measurements were carried out at the following temperatures inside the cold compartment of the climate chamber+20 °C, 0°C, -5°C, -20°C (at a constant temperature in the warm compartment of the chamber + 20°C). It is established that the reduction of PVC windows sound insulation begins to occur only at outdoor temperatures below 0 °C. The sound insulation of PVC window at an outdoor temperature -20°C is 3 dB lower than the sound insulation of the same window, determined under standard conditions (+20 °C). Obviously, existing methods of calculation of sound insulation of PVC windows it is necessary to adjust in terms of operational ambient temperatures and design features of the windows.