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Department of Civil Aviation
Category: Cladding Systems
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Sandwich Panels are available in Aluminium and Steel profiles. These panels are specially designed for building requiring high insulation values. The factory injected insulation core with polyurethane gives excellent properties.
MEI can provide a wide range of colors with reasonable period of time. A stock of fast moving color is available. Polyurethane insulation composed principally of the catalyzed products of polyisocyanate and polyhydroxyl closed-cell structure. It is used world wide as insulation against temperature extremes and has been adapted as one of the best energy material in the building industry.
MEI 38/200 PU Insulated Panel Specification
MEI 38/200 PU INSULATED PANEL |
INSULATION THICKNESS (IT mm) |
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35 |
50 |
80 |
100 |
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Allowable-Span (mm) |
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Steel |
Alum |
Steel |
Alum |
Steel |
Alum |
Steel |
Alum |
||
Top Skin Thickness (mm) |
0.5 |
2450 |
2400 |
2850 |
2750 |
3750 |
3450 |
4300 |
3900 |
0.7 |
2850 |
2800 |
3350 |
3200 |
4350 |
4000 |
5000 |
4500 |
|
0.9 |
3150 |
31005 |
3700 |
3650 |
4850 |
4200 |
5550 |
4550 |
|
Combined Conductivity W/m2oC |
P U |
0.419 |
0.326 |
0.226 |
0.187 |
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Span Design Criteria |
Conductivity Calculation conditions |
Steel yield strength 345 N/mm2, elastic modulus 205 KN/mm2 |
Thermal conductivity of polyurethane (PU) is 0.02 W/m.oC |
Aluminium yield 170 N/mm2, modulus 70 KN/mm2 |
Thermal conductivity of polystyrene (EPS) is 0.032 W/m.oC |
Maximum combination of working loads 1.5 KN/m2 |
Metal sheets ignored |
Span selected as the minimum value from pressure and suction case, assuming no bond slip |
Summer condition at roof (Heat transfer from out to inside) |
Bottom skin (Liner) thickness = 0.5 mm |
External wind speed 7.5Mph (4m/s) still air inside |
Allowable elastic deflection is L/150 < 20mm |
Equivalent thickness (including ribs) equals the total insulated volume/heat drained area |
Multi span construction |
