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Figure 2. Required properties for insulation
3. High‐Efficiency Insulations for Zero Energy Buildings in Korea
There are several high‐efficiency insulations for zero energy buildings in Korea. They are Low‐
Emissivity Hybrid Insulation and incombustible Vacuum Insulation Panel.
3.1. Low‐Emissivity Hybrid Insulation
3.1.1. Development of Low‐Emissivity Insulation
Low‐E Insulation is a multilayer product consisting of layers of aluminum foil and a honey‐comb
structure produced from polyethylene foam. The resulting structure creates reflective airspaces within
the cavity that reduce radiant heat transfer and heat flow by convection. The use of aluminum foil
ensures a minimum 95% reduction in radiation across the enclosed regions [4]. Figure 3 shows a 20
mm thick Low‐E Insulation structure.
Figure 3. 20 mm thick Low‐Emissivity Insulation
Low‐E Insulation has foil surface emissivity of 0.04 with enclosed air cells between foils. Its
core material is 35 times foamed polyethylene foam which is expanded to make air cells. The enclosed
air cells with foil reduce convective and radiative heat transfer.
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