Convert Hour-degree Fahrenheit per BTU to Hour-degree Celsius per kilocalorie
Convert Hour-degree Fahrenheit per BTU (h·°F/BTU) to Hour-degree Celsius per kilocalorie (h·°C/kcal) instantly and accurately.
Conversion Formula
h·°C/kcal = h·°F/BTU × 2.204622622
About Hour-degree Fahrenheit per BTU
The h·°F/BTU equals (5/9 × 3600)/1055.05585262 K/W ≈ 1.8956 K/W. It is the traditional US unit for thermal resistance in HVAC, building science, and insulation engineering. A pipe fitting with R = 1 h·°F/BTU passes 1 BTU/h per °F driving difference. Appears in ASHRAE handbooks, ASTM C177, and older US plumbing codes. 1 h·°F/BTU ≈ 1.8956 K/W.
About Hour-degree Celsius per kilocalorie
The h·°C/kcal equals 3600/4186.8 K/W ≈ 0.8598 K/W. Used in pre-SI European engineering literature (French, German, Italian) for heat transfer system calculations. A boiler with 1 h·°C/kcal resistance passes 1 kcal/h per °C temperature difference. Superseded by K/W and h·°C/W in modern standards. 1 h·°C/kcal ≈ 0.8598 K/W.
Quick Reference Table
| Hour-degree Fahrenheit per BTU (h·°F/BTU) | Hour-degree Celsius per kilocalorie (h·°C/kcal) |
|---|---|
| 1 h·°F/BTU | 2.20462 h·°C/kcal |
| 2 h·°F/BTU | 4.40925 h·°C/kcal |
| 5 h·°F/BTU | 11.0231 h·°C/kcal |
| 10 h·°F/BTU | 22.0462 h·°C/kcal |
| 25 h·°F/BTU | 55.1156 h·°C/kcal |
| 50 h·°F/BTU | 110.231 h·°C/kcal |
| 100 h·°F/BTU | 220.462 h·°C/kcal |