Thermic Fluids Properties Calculator
Therminol® Properties Calculator
Operating Conditions
Range: -3 to 345 °C
Required for Phase Check (Boiling Point)
Thermophysical Properties
Phase: Liquid (Stable)
Density (ρ)
---
kg/m³
Dynamic Viscosity (μ)
---
mPa·s (cP)
Specific Heat (Cp)
---
kJ/kg·K
Thermal Conductivity (k)
---
W/m·K
Kinematic Viscosity (ν)
---
cSt
Vapor Pressure (Abs)
---
bar(a)
Technical Notes
Variable Definitions
- T: Operating temperature entered by the user (°C).
- Pg: System pressure (bar(g)).
- Pabs: System absolute pressure (bar(a)) = Pg + Patm.
- Patm: Atmospheric pressure used for conversion (1.013 bar).
- ρ: Density (kg/m³).
- ν: Kinematic viscosity (cSt = mm²/s).
- μ: Dynamic viscosity (mPa·s = cP).
- Cp: Specific heat capacity at constant pressure (kJ/kg·K).
- k: Thermal conductivity (W/m·K).
- Pvap: Vapor pressure at temperature T (bar(a)).
Formulas / Logic
- Dynamic viscosity: μ (mPa·s) = ν (cSt) × ρ (kg/m³) / 1000.
-
Phase check: Compare Pvap(T) with
system absolute pressure Pabs.
- If Pvap > Pabs: boiling / vapor phase warning.
- If Pvap > 0.9 × Pabs: near-boiling warning (<10% margin).
- Property correlations: Each fluid uses curve-fit correlations versus temperature (polynomial/exponential/Antoine-like forms) intended to match typical vendor technical datasheet trends.
Assumptions / Notes
- Correlations are engineering estimates. For design/guarantee work, always verify with the latest Therminol®/vendor technical datasheet for the selected grade and operating range.
- Pressure input is treated as gauge. The calculator converts to absolute using Patm = 1.013 bar(a).
- Phase warning is a screening check based on vapor pressure only; it does not model two-phase hydraulics, flashing, or pump NPSH margins.
- Validity: If temperature is outside the recommended range shown, results are displayed but flagged as out-of-range.
- Units are fixed as displayed (SI-based): ρ (kg/m³), μ (mPa·s), ν (cSt), Cp (kJ/kg·K), k (W/m·K), pressures in bar.
References (typical): Vendor Therminol® technical datasheets; common
heat-transfer fluid property reporting conventions; Antoine-type
vapor pressure form for phase screening.