Convert Calories per Hour to Ton of Refrigeration
Convert Calories per Hour (cal/h) to Ton of Refrigeration (RT) instantly and accurately.
Conversion Formula
RT = cal/h × 3.306933933e-7
About Calories per Hour
One calorie per hour (cal/h) equals exactly 0.001163 W - the rate of transferring one thermochemical calorie (4.1868 J) per hour. A resting adult generates ~70-80 W ≈ 60,000-70,000 cal/h of heat. The unit appears in European and Asian HVAC standards for small-appliance heat loads and in laboratory calorimetry reporting metabolic activity of small organisms. Calorimetric enzyme assays also express catalytic heat in cal/h per unit enzyme. 1 cal/h = 0.001163 W.
About Ton of Refrigeration
One ton of refrigeration (RT) = 12,000 BTU/h ≈ 3,517 W - the cooling rate to freeze 1 short ton (2,000 lb) of water in 24 hours. This follows from water's latent heat: 144 BTU/lb × 2,000 lb ÷ 24 h = 12,000 BTU/h. US residential AC is 1.5-5 tons; a large commercial building 500-2,000 tons; a hyperscale data centre 50,000-100,000 tons. The RT is deeply embedded in North American HVAC catalogs, load calculation software, and contractor pricing. 1 RT = 3,516.85 W.
Quick Reference Table
| Calories per Hour (cal/h) | Ton of Refrigeration (RT) |
|---|---|
| 1 cal/h | 3.307 × 10-7 RT |
| 2 cal/h | 6.614 × 10-7 RT |
| 5 cal/h | 1.653 × 10-6 RT |
| 10 cal/h | 3.307 × 10-6 RT |
| 25 cal/h | 8.267 × 10-6 RT |
| 50 cal/h | 1.653 × 10-5 RT |
| 100 cal/h | 3.307 × 10-5 RT |