How is insulation thickness calculated for a flat surface?

For a flat surface: thickness = k × (T_hot − T_surface) / q, where k is thermal conductivity of insulation, T_hot is process temperature, T_surface is desired surface temperature, and q is heat flux. The surface heat transfer coefficient h_out also plays a role: q = h_out × (T_surface − T_ambient).

How does pipe insulation calculation differ from flat surfaces?

Pipe insulation uses the cylindrical heat transfer equation with logarithmic radius ratio: Q/L = 2π(T_hot − T_ambient) / [1/(h_in·r_i) + ln(r_o/r_i)/k_pipe + ln(r_ins/r_o)/k_ins + 1/(h_out·r_ins)]. The curved geometry means more insulation material is needed per unit of thermal resistance.

What is a typical insulation thermal conductivity?

Mineral wool: 0.035–0.045 W/mK. Glass wool: 0.030–0.040 W/mK. Polyurethane foam: 0.022–0.028 W/mK. Calcium silicate: 0.055–0.070 W/mK. Aerogel: 0.013–0.020 W/mK. Lower k = better insulator.

What surface temperature is safe for personnel protection?

For personnel protection, maximum surface temperature should be ≤60°C (140°F) according to most industrial standards. Some standards require ≤50°C for surfaces accessible to workers. This prevents burns from brief contact.

Does the outer surface heat transfer coefficient matter?

Yes. The outer film coefficient h_out (typically 5–25 W/m²K) affects the surface temperature. Still air: ~5–10 W/m²K. Light wind: ~15 W/m²K. Forced convection: 20–50 W/m²K. Lower h_out means higher surface temperature for same insulation.

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Calculadora de espesor de aislamiento

Calcule el espesor de aislamiento requerido para tuberías y superficies planas para alcanzar la temperatura superficial objetivo o limitar la pérdida de calor.

Tubería y planaISO 12241#180

Resultados

Espesor de aislamiento requerido

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Pérdida de calor por m² (o por m para tubería)

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Valor R del aislamiento

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Valor U Global

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Superficie plana

Donde q = h × (T_surface − T_ambient) es el flujo de calor desde la superficie exterior.

Tubería / cilindro

Para una tubería, el radio exterior del aislamiento r₂ se encuentra de forma iterativa para que la temperatura superficial sea igual a la objetivo. Q/L es la pérdida de calor por metro de longitud.

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