Question 1

How is insulation thickness calculated for a flat surface?

Accepted Answer

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).

Question 2

How does pipe insulation calculation differ from flat surfaces?

Accepted Answer

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.

Question 3

What is a typical insulation thermal conductivity?

Accepted Answer

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.

Question 4

What surface temperature is safe for personnel protection?

Accepted Answer

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.

Question 5

Does the outer surface heat transfer coefficient matter?

Accepted Answer

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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