MEPVAULT - U Value Calculator

MEPVAULT - U VALUE CALCULATOR

Construction Assembly Builder

MEPVAULT THERMAL ASSEMBLY REPORT

Project Assembly: --

	Material Description	Conductivity (λ) W/m·K	Thick (t) mm	Resistance (R) m²·K/W	Act

Total Resistance (R) 0.000m²·K/W

Overall U-Value (SI) 0.000W/m²·K

Overall U-Value (IP) 0.000BTU/h·ft²·°F

Ordering: Drag the ☰ icon to move layers up or down. Heat flow is calculated from top (Outside) to bottom (Inside).
Surface Films: Outside and Inside air films are added by default as per ASHRAE. You can delete them if modeling a sub-component.
Custom Materials: Select "Custom" to enter thermal conductivity for specific vendor data.
Air Gaps: For air cavities, set conductivity to 0 and enter the R-value directly (typically 0.15 to 0.18).

Thermal Data: National Building Code (NBC) 2016, Part 11, Table 4.
Calculations: ISHRAE Fundamentals & ASHRAE Handbook (Fundamentals).
Surface Films: R_so (0.04) and R_si (0.13) based on standard wind velocity and still air conditions.
Conversion: 1 W/m²·K = 0.1761 BTU/h·ft²·°F.