228 W/m²·K = 40.1531 BTU/hr·ft²·°F
| W/m²·K | BTU/hr·ft²·°F |
|---|---|
| 213 W/m²·K | 37.5115 |
| 218 W/m²·K | 38.392 |
| 223 W/m²·K | 39.2726 |
| 228 | 40.1531 |
| 233 W/m²·K | 41.0337 |
| 238 W/m²·K | 41.9142 |
| 243 W/m²·K | 42.7948 |
228 W/m²·K = 40.1531 BTU/hr·ft²·°F
1 W/(m²·K) = 0.176110 BTU/(hr·ft²·°F) · 1 BTU/(hr·ft²·°F) = 5.67826 W/(m²·K)