Based on sensitivity analysis, the economic EPS insulation thickness for exterior wall and roof was obtained.
This paper is a proposal to optimize the combination of surface reflectivity and the insulation thickness of exterior walls for energy savings in regions of Japan.
The new regulations would encourage better insulation by allowing buildings to add up to eight inches of thickness to exterior walls without its being counted in the building's maximum footprint.
Correlations are also developed, which express the dynamic thermal parameters of buildings in terms of the thickness of exterior wall layers and the surface percentage of envelope parts with different compositions.
Calculations of building thermal loads and economic analysis of the total cost for six cities from high-latitude to low-latitude regions of Japan were carried out for a range of surface reflectivity and insulation thickness of exterior walls.
Each exterior layer has a thickness of 200 to 300 nm and a diameter of 400 to 600 nm, while the relatively small middle layer has a thickness of 20 to 50 nm and a diameter approximately 80 nm smaller than the exterior layer.
However, there was no significant difference in burrow characteristics (exterior or interior diameter, wall thickness) between the facies.
The thicknesses of the exterior wall, interior wall, and slab were 36, 32, and 40 mm, respectively.
Therefore, thickness and material of exterior as well as interior walls and floors are valuable data when, for example, an optimum start/stop schedule for the heating system has to be provided.
We estimated the annual thermal loads of a simulated building floor and analyzed the cost of the building envelope in Sapporo, Tokyo, Nagoya, Osaka, Fukuoka and Naha, Japan, varying the surface reflectivity of the exterior walls from 0.1 to 0.8, and insulation thickness of the exterior walls from 10 mm to 100 mm, using the thermal load calculation software, New HASP/ACLD-β HASP/ACLD-βandsis.
