Convert BTU per hour to Tons of refrigeration
1 BTU per hour is 0.00008333 TR. One BTU per hour is exactly 0.0000833333333333 tons of refrigeration.
One BTU per hour is 8.3333 × 10^-5 tons of refrigeration. To convert BTU per hour to tons of refrigeration, multiply by 8.3333 × 10^-5; to go the other way, divide by 8.3333 × 10^-5 or multiply by 12000. The relation is exact but the figure is not: it is a rounding of a number that does not terminate, and it follows from NIST Special Publication 811. The rate US heating and air conditioning is sold in.
Factor checked against the defining standard · How we check
- BTU per hour × 8.3333 × 10^-5
1 * 0.00008330 TR
1 BTU per hour in every power unit
| Unit | Value | Exact factor |
|---|---|---|
| horsepower | 0.0003930147789 hp | × 0.000393014778922 |
| metric horsepower | 0.0003984657624 PS | × 0.000398465762413 |
| watts | 0.2930710702 W | × 0.293071070172 |
| kilowatts | 0.0002930710702 kW | × 0.000293071070172 |
| milliwatts | 293.0710702 mW | × 293.071070172 |
| megawatts | 0.0000002930710702 MW | × 0.000000293071070172 |
| tons of refrigeration | 0.00008333333333 TR | × 0.0000833333333333 |
| BTU per hour (as entered) | 1 BTU/h | — |
Factors are entered by hand from NIST Special Publication 811 rather than derived from a units library, so the ones that terminate are exact rather than rounded.
How do you convert BTU per hour to tons of refrigeration? The converter and the working
- 1.Take the measurement in BTU per hour.
- 2.Multiply by 8.3333 × 10^-5 — that is how many tons of refrigeration fit in one BTU per hour.
- 3.To go back the other way, divide by 8.3333 × 10^-5, or multiply by 12000.
Worked example: 25 BTU per hour to tons of refrigeration
- Formula
- BTU/h × 8.3333 × 10^-5 = TR
- Arithmetic
- 25 × 8.3333 × 10^-5 = 0.002083 TR
- Answer
- 25 BTU/h = 0.002083 TR
The factor is rounded for display; the figure above is computed from the full value.
BTU per hour to tons of refrigeration conversion table
| BTU per hour | Tons of refrigeration |
|---|---|
| 1 BTU/h | 0.00008333 TR |
| 2 BTU/h | 0.0001667 TR |
| 3 BTU/h | 0.00025 TR |
| 4 BTU/h | 0.0003333 TR |
| 5 BTU/h | 0.0004167 TR |
| 6 BTU/h | 0.0005 TR |
| 7 BTU/h | 0.0005833 TR |
| 8 BTU/h | 0.0006667 TR |
| 9 BTU/h | 0.00075 TR |
| 10 BTU/h | 0.0008333 TR |
| 12 BTU/h | 0.001 TR |
| 15 BTU/h | 0.00125 TR |
| 20 BTU/h | 0.001667 TR |
| 25 BTU/h | 0.002083 TR |
| 50 BTU/h | 0.004167 TR |
| 100 BTU/h | 0.01 TR |
| 200 BTU/h | 0.02 TR |
| 300 BTU/h | 0.02 TR |
| 500 BTU/h | 0.04 TR |
| 1000 BTU/h | 0.08 TR |
| 2000 BTU/h | 0.17 TR |
| 5000 BTU/h | 0.42 TR |
| 10000 BTU/h | 0.83 TR |
A ton of cooling is a ton of ice, melted over a day
One ton of refrigeration is exactly 12,000 BTU an hour — the rate at which a short ton of ice absorbs heat as it melts over 24 hours, which is how cooling was sold before it was made electrically. A three-ton domestic unit is 36,000 BTU/h or 10.5 kW of heat moved, and it has nothing to do with the weight of the equipment.
NIST Special Publication 811 — Guide for the Use of the International System of Units
What is a BTU per hour?
The rate US heating and air conditioning is sold in. A 12,000 BTU/h unit is one "ton" of cooling and about 3.5 kilowatts of heat moved.
What is a ton of refrigeration?
Exactly 12,000 BTU an hour — the rate at which a short ton of ice melts over a day, which is what air conditioning was measured against before it was made electrically. A three-ton domestic unit is 36,000 BTU/h, or 10.5 kW.
How many tons of refrigeration are in a BTU per hour?
One BTU per hour is 8.3333 × 10^-5 tons of refrigeration. Going the other way, one ton of refrigeration is 12000 BTU per hour. Both figures come from the same defined relation rather than from a measurement, which is why they are the same today as they were in 1959.
Every power unit here
The whole group — 8 units with their symbols and the size of each one in watts — is on the conversion index, along with every pair it makes. The table above already gives each of them relative to a BTU per hour.
Source: NIST Special Publication 811 — mechanical horsepower is 550 ft·lbf/s exactly
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Questions people actually ask
- How many tons of refrigeration are in a BTU per hour?
- 8.3333 × 10^-5. Exactly 12,000 BTU an hour — the rate at which a short ton of ice melts over a day, which is what air conditioning was measured against before it was made electrically. A three-ton domestic unit is 36,000 BTU/h, or 10.5 kW.
- How do I convert tons of refrigeration back to BTU per hour?
- Divide by 8.3333 × 10^-5, or multiply by 12000 — they are the same operation.
Other power conversions
Tons of refrigeration to BTU per hour — the same conversion the other way.