Convert Degree Fahrenheit per watt to Minute-degree Fahrenheit per BTU
Convert Degree Fahrenheit per watt (°F/W) to Minute-degree Fahrenheit per BTU (min·°F/BTU) instantly and accurately.
Conversion Formula
min·°F/BTU = °F/W × 17.58426421
About Degree Fahrenheit per watt
The degree Fahrenheit per watt (°F/W) equals exactly 5/9 K/W ≈ 0.5556 K/W. It appears in US power electronics datasheets and legacy JEDEC thermal specifications where junction-to-case resistance is reported in °F/W rather than °C/W or K/W. A device rated 5 °F/W has R = 5 × 5/9 ≈ 2.78 K/W. 1 °F/W = 5/9 K/W.
About Minute-degree Fahrenheit per BTU
The minute-degree Fahrenheit per BTU (min·°F/BTU) equals (5/9 × 60)/1055.05585262 K/W ≈ 0.03159 K/W. Used in US refrigeration and air-conditioning engineering where capacity is expressed in BTU/min - 1 ton of refrigeration equals 200 BTU/min. Thermal resistance of evaporator and condenser circuits is conveniently quoted in this unit. 1 min·°F/BTU ≈ 0.03159 K/W = 60 s·°F/BTU.
Quick Reference Table
| Degree Fahrenheit per watt (°F/W) | Minute-degree Fahrenheit per BTU (min·°F/BTU) |
|---|---|
| 1 °F/W | 17.5843 min·°F/BTU |
| 2 °F/W | 35.1685 min·°F/BTU |
| 5 °F/W | 87.9213 min·°F/BTU |
| 10 °F/W | 175.843 min·°F/BTU |
| 25 °F/W | 439.607 min·°F/BTU |
| 50 °F/W | 879.213 min·°F/BTU |
| 100 °F/W | 1758.43 min·°F/BTU |