My question: Because SRI capabilities of newly developed products are outpacing accepted modeling techniques and with antiquated static R values still being primarily used in overall calculations where/what would be the best avenue (DOE, IECC, TAMU-TERP, ASHRE) for someone who has developed enhanced modeling capabilities that provide a more accurate functional measure of heat transfer and subsequent energy use?
Common knowledge:
• R value quantifies conduction: 1 of 3 measures of heat transfer in thermodynamics.
• Derivation of R value from k is very manipulatable (changing temperatures- ΔT).
• At least 2 delta T’s are now required for R value quantification, however models do not incorporate this as a dynamic R value.
o Most insulation’s R value is inversely proportional to increasing delta t’s
o IECC code accepts ASTM 518 with a ΔT of only 3° F to quantify R value
No insulation is needed at a ΔT of 3°
A static R value at this low ΔT leads to wildly inaccurate modeling
• New Energy Codes require radiant barriers with reflectivity, emissivity or SRI values yet few models take these primary heat transfer methods into account.
• Angle of incidence and capacitance of course exist yet are also rarely quantified in overall heat transfer modeling
