This calculator is used to compute the thermodynamic properties of saturated steam. This calculator uses steam properties from the 1967 ASME Steam Tables, published by the American Society of Mechanical Engineers. This calculator allows the user to input either temperature or pressure in either metric or I-P units. The calculator then outputs the pressure or temperature, the specific volume, the enthalpy, and the entropy. The values are obtained by a linear interpolation between available data points. This calculator provides reasonable accuracy. Before I release this calculator, I must have more precise data. In the meantime, please feel free to use it, but make sure you double check your answers with another source of data - just to be safe.

Note: btu conversions are done with the International Table values.

EXAMPLE: How much steam flow would be required at a steam heating coil if you had a heat load of 100,000 BTUs per hour, and steam was available at 5 PSIG?

Enter the steam table with a pressure of 19.696 PSIA (14.696 + 5). The calculator should return a latent heat of evaporation equal to 960.4 BTUs per pound mass. This is the difference in enthalpy from the saturated vapor state to the saturated liquid state. Now simply divide the heat load of 100,000 BTU/HR by the latent heat of evaporation 960.4 BTU/lbm. The result is 104.12 lbm/hr. This is the required flow rate of steam.

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Situation 1

Given: Temperature in degrees F or C
Look up: Pressure, specific volume (sat liq, evap, sat vap), enthalpy (sat liq, evap, sat vapor), and entropy (sat liq, evap, sat vapor).

Situation 2

Given: Pressure in PSI or bar
Look up: Temperature, specific volume (sat liq, evap, sat vap), enthalpy (sat liq, evap, sat vapor), and entropy (sat liq, evap, sat vapor).