bulk insulation การใช้

There are essentially two types of building insulation-bulk insulation and reflective insulation.
It also has very low emittance values " E-values " ( typically 0.03 compared to 0.90 for most bulk insulation ) which significantly reduces heat transfer by radiation.
The effectiveness of bulk insulation is commonly evaluated by its R-value, of which there are two-metric ( SI ) and US customary, the former being 0.176 times the latter.
The question of how to quantify performance of other systems such as radiant barriers has resulted in controversy and confusion in the building industry with the use of R-values or'equivalent R-values'for products which have entirely different systems of inhibiting heat transfer . ( In the U . S ., the federal government's R-Value Rule establishes a legal definition for the R-value of a building material; the term'equivalent R-value'has no legal definition and is therefore meaningless . ) According to current standards, R-values are most reliably stated for bulk insulation materials.