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Wall U-Value Calculator

Science & Engineering

GB 50176 layered thermal resistance

Quick Answer

Wall U-Value Calculator: GB 50176 layered thermal resistance. Wall U-Value Calculator uses standard science & engineering formulas to compute accurate results instantly.

Wall layers

mm
mm
mm
Thermal transmittance U/K0.64 W/(m²·K)
Total resistance R₀1.57 m²·K/W
Insulation layer R1.22 m²·K/W

How it works

  1. 1Layer R = δ ÷ λ: base 0.200 ÷ 1.74 = 0.11; insulation 0.050 ÷ 0.041 = 1.22; plaster 0.040 ÷ 0.93 × 2
  2. 2R₀ = Ri 0.11 + Σ layers + Re 0.04 = 1.57 m²·K/W
  3. 3K = 1 ÷ R₀ = 1 ÷ 1.57 = 0.64 W/(m²·K)
GB 55015-2021 residential exterior wall U-value limits: severe cold ≈0.25-0.35, cold ≈0.35-0.45, hot-summer-cold-winter ≈0.8, hot-summer-warm-winter ≈1.5 W/(m²·K) - check the climate zone tables. Design λ values need material correction factors (EPS 1.05-1.2, rock wool 1.1-1.2). Thermal bridges at beams/columns raise the average U by 10-30%. Windows are usually the weak point (double glazing ≈2.5-2.8) - prioritize glazing upgrades.

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How to Use

  1. Enter known quantities: fill values and confirm units in the Wall U-Value Calculator.
  2. Instant solution: unknowns solve live with the formula shown transparently.
  3. Use constant/material tables: standard physical constants and material data are listed on this page.
  4. Compare conditions: change inputs to compare scenarios.

Key Points

  • Wall U-Value Calculator is a free online science & engineering tool — open and use, no sign-up.
  • All calculations run locally in your browser; your data never leaves the device.
  • Key capability: GB 50176 layered thermal resistance.
  • Results come with formulas and reference tables so you can verify every number.

Formula & How It Works

Wall U-Value Calculator formula

Wall U-Value Calculator uses standard science & engineering formulas to compute accurate results instantly.

FAQ

How do I use the Wall U-Value Calculator?
Open the page and fill in the input fields — results update automatically. GB 50176 layered thermal resistance.
Are the results accurate?
Yes. Standard formulas and conversion factors are used and verified.
Is it free? Do I need to sign up?
Completely free. No registration, login or download required.
Does it work on mobile?
Yes. The responsive design works on phones, tablets and desktops.
Is my data saved?
No. Everything runs locally in your browser.

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Source & Updates

Based on CODATA recommended constants and standard physics formulas. Last updated: 2025-07

Last updated:

Formulas and content on this page are reviewed by the YiJianSuan team. For reference only — official sources prevail.

Maintained and periodically reviewed by the YiJianSuan editorial team — review process in ourEditorial Policy.

Cite this page: YiJianSuan. Wall U-Value Calculator[EB/OL]. https://www.yijiansuan.com/en/c/science/insulation-r

Results provided by this tool are for reference only and do not constitute professional advice.