Question

The maximum heat loss from a pipe occurs when the critical radius equals:

• A. The ratio of the surface coefficient of heat transfer to the thermal conductivity of the insulation
• B. The ratio of the thermal conductivity of the insulation to the surface coefficient of heat transfer
• C. The product of thermal conductivity of the insulation and the surface coefficient of heat transfer
• D. The radius of the pipe

Hint:

The critical radius concept helps optimize insulation to minimize heat loss.

Answer 1

The Correct Option is B

The critical radius of insulation (\( r_c \)) is given by:

\( r_c = \frac{k}{h} \)

where \( k \) is the thermal conductivity of the insulation and \( h \) is the surface heat transfer coefficient.