PWS-PIR-ST-120 - Wall sandwich panel - polyurethane foam - visible fastening

When designing, temperature differences between the claddings of sandwich panels must be taken into account. The temperature gradients resulting from the difference between the outdoor temperature_T1 and the indoor temperature_T2 depend on several factors:

• intended use of the facility (temperature range inside the facility –_T2)
• Location of the building—its orientation relative to the sun
• color of the exterior cladding (_T1).

Depending on latitude, elevation above sea level, and distance from the sea, four different winter temperature levels are used on the European continent (T1—exterior cladding):

• 0,^-10°C,
• 0,^-20°C, (e.g., Poland)
• 0,^-30°C(e.g., Scandinavian countries)

The temperature of the outer cladding for roof panels covered with a layer of snow is^0°C.

An outdoor temperature of -20 ^°Cduring the winter was used for the calculations.

The temperature of the exterior cladding,_T1, reaches its maximum value in the summer and depends on the color and reflectivity of the surface. The_T1 values, which are the minimum values for strength-of-resistance (SGN) calculations and are appropriate for serviceability limit state (SGU) calculations, are adopted as follows:

• Very bright colors:_RG = 75–90,_T1 = +55^_oC
• light colors_RG = 40–74_T1 =^+65°C
• dark colors_RG = 8–39_T1 =^+80°C

where_RG is the reflectance of the rays relative to magnesium oxide = 100%

The table below shows a classification by color group for the individual colors available in the Pruszyński Company product line.