Specific Enthalpy of Saturated Steam

The specific enthalpy of saturated steam, denoted as

${ℎ}_{\text{steam}}$, represents the total energy content per unit mass of steam at the saturation point, where it exists as both liquid and vapor phases in equilibrium. To calculate the specific enthalpy of saturated steam, you typically use steam tables or steam property calculators, as it involves considering the phase change and the energy associated with it.

However, if you want an approximate calculation and have the saturation pressure (${𝑃}_{\text{sat}}$) and temperature (${𝑇}_{\text{sat}}$) of the steam, you can use the following formula:

${ℎ}_{\text{steam}}={𝑐}_{𝑝,\text{steam}}\cdot ({𝑇}_{\text{sat}}-{𝑇}_{\text{ref}})+{ℎ}_{\text{fg}}$

Where:

• ${ℎ}_{\text{steam}}$ = specific enthalpy of saturated steam (in joules per kilogram, J/kg)
• ${𝑐}_{𝑝,\text{steam}}$ = specific heat capacity of steam (in joules per kilogram per Kelvin, J/(kg·K))
• ${𝑇}_{\text{sat}}$ = saturation temperature of steam (in Kelvin, K)
• ${𝑇}_{\text{ref}}$ = reference temperature (in Kelvin, usually taken as 0°C or 273.15 K)
• ${ℎ}_{\text{fg}}$ = latent heat of vaporization (in joules per kilogram, J/kg)

The specific heat capacity of steam, ${𝑐}_{𝑝,\text{steam}}$, is approximately 2,000 J/(kg·K), and the latent heat of vaporization, ${ℎ}_{\text{fg}}$, is approximately 2,260 kJ/kg.

Please note that this formula provides an approximation and may not be as accurate as values obtained from steam tables or property calculations. Additionally, ${𝑇}_{\text{sat}}$ and ${𝑃}_{\text{sat}}$ need to be known precisely for accurate calculations.