Definition: A material’s ability to conduct heat, measured in W/(m·K) (watts per meter-kelvin). Lower values indicate better insulation.
Common Values:
- Polyurethane foam: 0.022-0.028 W/(m·K) (excellent insulation)
- Polystyrene (EPS): 0.033-0.040 W/(m·K) (good insulation)
- Fiberglass: 0.040-0.045 W/(m·K) (moderate insulation)
- Concrete: 1.4-1.7 W/(m·K) (poor insulation)
- Steel: 50 W/(m·K) (conducts heat readily)
Why It Matters: Insulation selection based on thermal conductivity determines heat leakage and refrigeration load. Lower thermal conductivity = less heat gain = lower operating cost.
Related Terms: U-Value, R-Value, Insulation, Heat Transfer