Superheated Steam Properties Calculator
Enter Pressure with either Temperature or Degree of Superheat. Calculates v, ρ, h, s, u and heat capacities (Cp, Cv, k). Exports to Excel with live formulas.
Saturation Temperature at P (Tsat)
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Actual Temperature (T)
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Degree of Superheat (ΔT)
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Specific Volume v (m³/kg)
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Density ρ (kg/m³)
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Enthalpy h (kJ/kg)
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Entropy s (kJ/kg·K)
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Internal Energy u (kJ/kg)
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Isobaric Heat Capacity Cp (kJ/kg·K)
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Isochoric Heat Capacity Cv (kJ/kg·K)
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Heat Capacity Ratio k = Cp/Cv
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Formula & correlation notes
- Saturation (for Tsat): IAPWS Wagner-type p(T); for T from P use Newton with central derivative.
- Ideal gas: v = R·T/P (with P in bar → ×100 to kPa); ρ = 1/v.
- Enthalpy (superheated): h ≈ Cp·T + h₀ with h(100 °C,sat)=2676 kJ/kg ⇒ h₀ = 2676 − Cp·Tref.
- Entropy (superheated): s ≈ sg,ref + Cp·ln(T/Tref) − R·ln(P/Pref).
- Internal energy: u = h − P·v (P in kPa, v in m³/kg → kJ/kg).
- Heat capacities: Cv = Cp − R; k = Cp/Cv. (Single-average Cp used.)