What is ton of refrigeration?
A ton of refrigeration is a power unit measuring the heat removal capacity of cooling systems, equal to 12,000 BTU per hour. It is the standard capacity rating for commercial and industrial air conditioning units in the United States.
Real-world uses
The ton of refrigeration (TR) is used for rating commercial and industrial cooling systems, chillers, and large-scale HVAC equipment. A small commercial building might need a 20–100 TR chiller. Data centres measure cooling capacity in TR. One TR = 12,000 BTU/h = approximately 3.517 kW.
History
The ton of refrigeration originated in the 19th century ice trade, when mechanical refrigeration systems were judged by their ability to replace ice delivery. One ton was defined as the cooling equivalent of melting one ton of ice per day. As mechanical refrigeration displaced natural ice by the early 20th century, TR became a standard industrial cooling unit.
Common mistakes
Confusing refrigeration tons with metric tons of mass—they are completely unrelated. Also, the "ton" in TR originated from the cooling power needed to melt one short ton (2,000 lb) of ice in 24 hours, not from any mass being cooled.
What is kilocalorie per hour?
Kilocalorie per hour is a unit of power expressing energy transfer as dietary calories per hour. It is used in nutrition and exercise physiology to express the rate of energy expenditure during physical activity.
Real-world uses
Kilocalories per hour (kcal/h) are used in exercise physiology to express metabolic power output (a brisk walk burns about 300 kcal/h, cycling about 500–800 kcal/h), and in HVAC engineering in Asia and Latin America to rate heating and cooling equipment, where it bridges nutritional and thermal engineering contexts.
History
The kilocalorie per hour emerged as a natural unit at the intersection of nutritional science and physiology, where metabolic rates had long been expressed in food energy per unit time. In HVAC contexts, it provided a familiar scale for countries where kilocalories were the customary energy unit before SI adoption.
Common mistakes
Confusing kcal/h (power) with kcal (energy). A person burning 300 kcal/h for 2 hours has expended 600 kcal, not 300 kcal. Also, mixing up kcal/h with kJ/h: 1 kcal/h = 4.184 kJ/h ≈ 1.163 W.
When is this conversion used?
Converting ton of refrigeration to kilocalorie per hour is useful in the power domain when comparing values across different measurement standards or applying formulas that require a specific unit.
Worked examples
1 ton of refrigeration = 3,023.94913156 kilocalorie per hour
1 kilocalorie per hour = 1.163 watt
How to convert ton of refrigeration to kilocalorie per hour
To convert ton of refrigeration to kilocalorie per hour, multiply the value by 3,023.94913156.
To convert kilocalorie per hour back to ton of refrigeration, multiply by 0.00033069.
Measurement standards
The watt is the SI derived unit of power, defined as one joule per second (kg·m²/s³). Horsepower remains in widespread informal use, particularly in the automotive industry, but has no single universal definition across regions.
Did you know?
The human body at rest produces about 80 watts of power — roughly enough to keep an incandescent light bulb glowing. During intense exercise, a trained cyclist can sustain over 400 watts, and elite sprinters briefly exceed 2,000 watts.
Quick reference: ton of refrigeration to kilocalorie per hour
| ton of refrigeration | kilocalorie per hour |
|---|---|
| 0.1 | 302.39491316 |
| 0.5 | 1,511.97456578 |
| 1 | 3,023.94913156 |
| 2 | 6,047.89826311 |
| 5 | 15,119.74565778 |
| 10 | 30,239.49131556 |
| 25 | 75,598.72828891 |
| 50 | 151,197.45657782 |
| 100 | 302,394.91315563 |
| 250 | 755,987.28288908 |
| 500 | 1,511,974.56577816 |
| 1,000 | 3,023,949.13155632 |
Common values
| ton of refrigeration | kilocalorie per hour | |
|---|---|---|
| LED light bulb | 0.00284345 ton of refrigeration | 8.59845228 kilocalorie per hour |
| Desktop computer | 0.08530354 ton of refrigeration | 257.95356836 kilocalorie per hour |
| Microwave oven | 0.28434514 ton of refrigeration | 859.84522786 kilocalorie per hour |
| Small car engine | 21.32588522 ton of refrigeration | 64,488.39208942 kilocalorie per hour |
| Wind turbine (large) | 853.03540878 ton of refrigeration | 2,579,535.68357696 kilocalorie per hour |
Available Power units
More ton of refrigeration conversions
- Convert ton of refrigeration to watt
- Convert ton of refrigeration to kilowatt
- Convert ton of refrigeration to horsepower (mechanical)
- Convert ton of refrigeration to megawatt
- Convert ton of refrigeration to gigawatt
- Convert ton of refrigeration to milliwatt
- Convert ton of refrigeration to microwatt
- Convert ton of refrigeration to BTU per hour
- Convert ton of refrigeration to kilocalorie per hour
Assumption: horsepower values use mechanical horsepower.