Fluidtool DocsCoolProp Wiki
A practical thermodynamics and refrigerants primer for HVAC and automotive use cases.
Short, practical notes to help you interpret results from FluidTool. These pages are educational and do not replace codes, standards, manufacturer guidance, or local regulations.
For humid-air topics, pair these notes with the Humid Air Calculator when you want to compute real states after reading the concept pages.
P-h Diagram
How to read a pressure-enthalpy chart: dome, quality, isolines, and cycle intuition.
Superheat & Subcooling
ΔTsh and ΔTsc definitions, how they relate to saturation, and measurement pitfalls.
Two-phase quality (Q)
How vapor quality works on the saturation line and why PT can be ambiguous there.
Saturation pressure vs temperature
Psat(T) and Tsat(P), superheat/subcooling intuition, and common pitfalls.
Refrigerant PT chart
Organized refrigerant-specific PT chart primers and guidance on choosing the right chart for your system.
Psychrometric Chart
Learn how to read a moist air chart, then apply those ideas in the Humid Air Calculator.
Dew Point
Understand dew point, then use the Humid Air Calculator to check condensation risk and RH relationships.
Wet-bulb temperature (Twb)
Understand Twb, then use the Humid Air Calculator to derive RH, dew point, and enthalpy.
RH vs Humidity Ratio (W)
Learn why RH and W behave differently, then compare both in the Humid Air Calculator.
Mixing Outdoor Air & Return Air
Learn why mixed air is solved with W and h, then use the Humid Air Calculator to compute OA/RA endpoint states.
For saturation-focused engineering work, open Property Lookup to compare Psat/Tsat trends and export CSV tables.