Use this Lbs Of Steam To Btu Calculator to convert steam mass or flow to total, latent, or custom enthalpy energy at selected pressure conditions, or reverse-solve pounds.
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Lbs Of Steam To Btu Formula
The following formula converts steam mass to energy using a specified enthalpy basis. For process heat, E is the inlet minus outlet enthalpy.
Variables:
- BTU is the energy content in British Thermal Units
- L is the amount of steam in pounds (lbs)
- E is the selected specific enthalpy or enthalpy change in Btu/lb
Multiply steam mass by the applicable specific energy. Total saturated-steam enthalpy hg includes the liquid-water reference enthalpy; latent heat hfg describes condensation to saturated liquid at the same pressure. They are different quantities.
| Steam (lb) | Steam (kg) | Energy (BTU) | Energy (kJ) |
|---|---|---|---|
| 1 | 0.454 | 970.000 | 1023.404 |
| 5 | 2.268 | 4850.000 | 5117.021 |
| 10 | 4.536 | 9700.000 | 10234.042 |
| 20 | 9.072 | 19400.000 | 20468.084 |
| 25 | 11.340 | 24250.000 | 25585.104 |
| 30 | 13.608 | 29100.000 | 30702.125 |
| 40 | 18.144 | 38800.000 | 40936.167 |
| 50 | 22.680 | 48500.000 | 51170.209 |
| 75 | 34.019 | 72750.000 | 76755.313 |
| 100 | 45.359 | 97000.000 | 102340.418 |
| 150 | 68.039 | 145500.000 | 153510.627 |
| 200 | 90.718 | 194000.000 | 204680.835 |
| 250 | 113.398 | 242500.000 | 255851.044 |
| 300 | 136.078 | 291000.000 | 307021.253 |
| 400 | 181.437 | 388000.000 | 409361.671 |
| 500 | 226.796 | 485000.000 | 511702.089 |
| 750 | 340.194 | 727500.000 | 767553.133 |
| 1000 | 453.592 | 970000.000 | 1023404.177 |
| 1500 | 680.389 | 1455000.000 | 1535106.266 |
| 2000 | 907.185 | 1940000.000 | 2046808.354 |
| * Rounded to 3 decimals. Uses an illustrative latent heat of 970 Btu/lb, approximately atmospheric-pressure condensation, rather than total steam enthalpy. The calculator preset uses 970.3 Btu/lb. 1 Btu (IT) = 1.05505585262 kJ; 1 lb = 0.45359237 kg. | |||
What Does “Lbs Of Steam to Btu” Mean?
Converting pounds of steam to Btu requires a specific enthalpy or enthalpy change in Btu/lb; mass alone does not determine heat. For a heating process, Q = m(hin − hout). Dry saturated steam condensing to saturated water at the same pressure releases latent heat hfg. Total enthalpy hg uses a liquid-water reference and is not all released by condensation alone. Pressure, steam quality, superheat and condensate conditions affect the appropriate property values.
How to Calculate Lbs Of Steam To Btu?
The following steps outline how to calculate the Lbs Of Steam To Btu using the formula BTU = L * E.
- First, determine the amount of steam in pounds (L).
- Next, choose the applicable specific enthalpy or enthalpy change in Btu/lb (E).
- Next, gather the formula from above = BTU = L * E.
- Finally, calculate the Lbs Of Steam To Btu.
- After inserting the variables and calculating the result, check your answer with the calculator above.
Example Problem :
Use the following variables as an example problem to test your knowledge.
amount of steam in pounds (L) = 50
Assumed specific enthalpy change (E) = 1200 Btu/lb. Then 50 × 1200 = 60,000 Btu. Select Custom steam-table value to reproduce this assumed example.
