How does ASTEC outperform 4 inches (10 cm) of foam insulation?
We compared an ASTEC-coated metal roof without insulation with another metal roof having 10 cm of polyurethane foam. This allowed us to calculate the surface temperature under identical simulated environmental conditions. In addition, the roofs were given a “typical” 40 m length to determine the thermal shock reduction provided by ASTEC. The following steps were followed in the calculations: 1. The thermal properties (for conduction) of the materials (metal roof, ASTEC, polyurethane foam) specified were based on ASHRAE Fundamental Handbook data. 2. Environmental conditions were given as follows: a. Outside Air Temperature: 35˚ C b. Inside Air Temperature with Air-Conditioning: 24˚ C c. “Clear day” solar radiation factor: 905 W/m2 3. Constant Values: a. The Stefan-Boltzmann constant (for radiation). b. Air film coefficient (for convection): we used identical air film coefficients for both, the outside air and the inside air.
We compared an ASTEC-coated metal roof without insulation with another metal roof having 10 cm of polyurethane foam. This allowed us to calculate the surface temperature under identical simulated environmental conditions. In addition, the roofs were given a “typical” 40 m length to determine the thermal shock reduction provided by ASTEC. The following steps were followed in the calculations: 1. The thermal properties (for conduction) of the materials (metal roof, ASTEC, polyurethane foam) specified were based on ASHRAE Fundamental Handbook data. 2. Environmental conditions were given as follows: a. Outside Air Temperature: 35˚ C b. Inside Air Temperature with Air-Conditioning: 24˚ C c. “Clear day” solar radiation factor: 905 W/m2 3. Constant Values: a. The Stefan-Boltzmann constant (for radiation). b. Air film coefficient (for convection): we used identical air film coefficients for both, the outside air and the inside air. CONCLUSION: The ASTEC coated roof surface temperature was calc
