Thermal conductivity

Physical significance: to characterize the thermal conductivity of substances.

numerical expression: the thermal conductivity of the material is 1W/m.k when the heat conduction is 1W in 1 square metre area, 1 metre in thickness and 1 hour. 1Kcal/m.h. = 1.163 W/m.k.

Influencing factors: The value of thermal conductivity depends on the structure, bulk density, temperature, pressure, ambient atmosphere and humidity of the material.

Value determination: Direct test method and calculation method are usually used.

Calculating method: natural material lambda=0.035+0.203 (t/1000) 2kcal.m.h.. C

Compound lambda=0.054+0.272*10-6 T with 2 W/m.k

Testing method: Hotline method. Features: Fast speed, low accuracy.

Plate method. Features: Slow speed, high accuracy