Closed protective roller significantly improves heat and sound insulation characteristics of the "window-shutters." Considering the design of protective blinds (shutters) in terms of thermal performance, it should be noted that in Depending on the season is changing the nature of the protective roller shutters – as sunscreen in summer and winter as an additional thermal insulation. During the winter period of low temperatures coincides with the period of short daylight days and long nights when the windows can be closed with protective shutters completely. The screen does not affect the flow of solar heat, as it slightly in the winter, but only changes the thermal resistance of the "window – Protective blinds." The most effective protective exterior blinds, insulated slats, the thickness of 10-15 mm. Thermal resistance of the screen is roughly equivalent to the usual window with double glazing and single-chamber is about 0.36 square meters. * C / watt. Thus, provided that the infiltration of cold air through a screen will be within the normal terms of the standard window, the total thermal resistance to account for the window blinds will increase by 2 times. In summer conditions, intense solar radiation is accompanied by the long daylight hours.

The main factor affecting the indoor climate is overheating, primarily associated with the thermal radiation from the sun. Particularly important from this point of view should be considered as the location of the screen outside the window, as in this case when it is heated by heat exchange with the environment by convection to the outside air and radiation, "the street". In this case the shield may be almost completely restrict the amount of solar heat radiation in the room, which at the latitude of Kiev can reach 420 W / m at vertical surface of the facade. System, "window blinds, protective" looks privlekatielno in terms of the factor that its characteristics vary depending on open or closed position of the screen. We can assume that Such a system has a variable heat and sound insulating properties. Cooling the room at night by opening windows and protective roller shutters, and closing the system of "window-blinds defense" during the day (in summer), we can achieve optimum temperature indoors during the hottest days.

For example, the summer climate conditions are: the average maximum temperature t max = +32 C, daily temperature amplitude outside Air A = 10.7 C; daily outdoor air temperature t = 32 days C night outdoor temperature t H = 21.3 G. In our example, can be cooled to room temperature overnight with 21.3 and try to keep it throughout the day with the help of protective blinds in the light of increased thermal protective roller shutters and high heat capacity of the building envelope. Thermal resistance and sound insulation depends on the design of blades (standard or insulated) and the thickness of the air gap between the protective shutters and window (Figure 1) The figure shows that the level of thermal insulation system "window-blinds protection" increases with the distance between the surfaces of the window and screen. This dependence is maintained, provided that this distance is within 4 cm, over which the thermal resistance of the system remains virtually unchanged. Buy Roller in Kiev you can by calling Phone: (044) 383-09-54