🛡️ MLI Heat Leak Calculator

Effective emissivity from layer count · practical degradation · blanket heat leak

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Blanket

Results

Ideal ε* (layers)
–
Effective ε* (flight)
–
Heat leak flux
– W/m²
Total heat leak
– W
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📖 How to use

  1. Estimate ε* from the layer count, then apply the degradation factor — flight blankets perform 5–10× worse than the ideal formula because of seams, edges and penetrations.先按层数估算 ε*，再乘退化系数——由于接缝、边缘与穿舱件，实际飞行毯性能比理想公式差 5–10 倍。
  2. Or switch to measured ε* and use your vendor/heritage value (0.01–0.03 typical).也可切换为实测 ε*，使用厂商/飞行继承数据（典型 0.01–0.03）。
  3. Beyond ~20–25 layers extra layers buy little — the leak is dominated by seams and standoffs.超过约 20–25 层后再加层收益很小——漏热由接缝与支撑主导。
  4. Use ε*·A as the radiative term in the Heater tool for MLI-wrapped components.包覆 MLI 的部件在加热器工具中辐射项即取 ε*·A。

MLI effective emissivity

For N floating shields of emissivity ε_f between two surfaces, the ideal effective emissivity is

ε*_ideal = ε_f / ((N+1)·(2−ε_f))

and the blanket leak is Q = ε*·σ·A·(T_h⁴ − T_c⁴). Real blankets are dominated by edge effects, seams, lacing buttons and harness penetrations, so flight values are 5–10× the ideal — always use measured data when available (ε* ≈ 0.015–0.03 for good workmanship).

All computation runs locally in your browser.

MLI 有效发射率

两表面之间夹 N 层发射率为 ε_f 的反射屏，理想有效发射率为

ε*_理想 = ε_f / ((N+1)·(2−ε_f))

毯漏热 Q = ε*·σ·A·(T_h⁴ − T_c⁴)。实际隔热毯受边缘效应、接缝、系扣与线缆穿舱主导，飞行值为理想值的 5–10 倍——有实测数据务必用实测（工艺良好时 ε* ≈ 0.015–0.03）。

全部计算在你的浏览器本地完成。