Moist-air mass and enthalpy
Treats moist air as an ideal mixture. It uses the KNMI Magnus phase formulas and ASHRAE 2021 equations 21 and 32, and leaves out the enhancement factor.
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Treats moist air as an ideal mixture. It uses the KNMI Magnus phase formulas and ASHRAE 2021 equations 21 and 32, and leaves out the enhancement factor. Pressure must be 5 to 200 kPa, and vapor pressure must be below total pressure. Enthalpy is measured from 0 °C per kilogram of dry air. This is not an approval for plant design.
Model, grammar and limits
pv=RH·es(T); W=.621945pv/(p−pv); h=1.006T+W(2501+1.86T) kJ/kgda
Numbers can have up to 48 characters, with a decimal point or e, and no thousands separators. Curves use 2 to 501 samples plus up to 16 section endpoints. Use up to 32 forces or sources and up to 16 sections. Springs take 1 to 20 periods with at least 8 samples per period; pendulum angles run from 0 to 179°. Magnus covers −40 to 35 °C over water and −40 to 0 °C over ice; relative humidity 0 to 100%, pressure 5 to 200 kPa, and vapor pressure must be below total pressure. Backup is limited to 1 MiB. Invalid, non-unique or unresolved data are rejected.
Results are numerical idealizations in SI units, shown with up to 10 digits; CSV keeps the numeric values and units. 9.80665 m/s² is the conventional standard g, not local gravity. Uncertainty in your inputs or the model is not estimated, and nothing here is a physical approval.
Calculation and backup stay in this browser. Workers stop after 15 seconds, or when you edit, reset or cancel. Inputs are never uploaded or stored. Input data, formulas and filenames are never sent. Only with your optional consent, Refentra sends aggregate counts of actions and outcomes, without input content.
Use the chosen model
- Model, grammar and limits
Treats moist air as an ideal mixture. It uses the KNMI Magnus phase formulas and ASHRAE 2021 equations 21 and 32, and leaves out the enhancement factor. Pressure must be 5 to 200 kPa, and vapor pressure must be below total pressure. Enthalpy is measured from 0 °C per kilogram of dry air. This is not an approval for plant design.
- Calculate
pv=RH·es(T); W=.621945pv/(p−pv); h=1.006T+W(2501+1.86T) kJ/kgda. Numbers can have up to 48 characters, with a decimal point or e, and no thousands separators. Curves use 2 to 501 samples plus up to 16 section endpoints. Use up to 32 forces or sources and up to 16 sections. Springs take 1 to 20 periods with at least 8 samples per period; pendulum angles run from 0 to 179°. Magnus covers −40 to 35 °C over water and −40 to 0 °C over ice; relative humidity 0 to 100%, pressure 5 to 200 kPa, and vapor pressure must be below total pressure. Backup is limited to 1 MiB. Invalid, non-unique or unresolved data are rejected.
- Download CSV report
Results are numerical idealizations in SI units, shown with up to 10 digits; CSV keeps the numeric values and units. 9.80665 m/s² is the conventional standard g, not local gravity. Uncertainty in your inputs or the model is not estimated, and nothing here is a physical approval. Calculation and backup stay in this browser. Workers stop after 15 seconds, or when you edit, reset or cancel. Inputs are never uploaded or stored. Input data, formulas and filenames are never sent. Only with your optional consent, Refentra sends aggregate counts of actions and outcomes, without input content.
Model questions
Model, grammar and limits
Treats moist air as an ideal mixture. It uses the KNMI Magnus phase formulas and ASHRAE 2021 equations 21 and 32, and leaves out the enhancement factor. Pressure must be 5 to 200 kPa, and vapor pressure must be below total pressure. Enthalpy is measured from 0 °C per kilogram of dry air. This is not an approval for plant design. pv=RH·es(T); W=.621945pv/(p−pv); h=1.006T+W(2501+1.86T) kJ/kgda
Unit
Air temperature; Saturation surface; Relative humidity for selected phase (%); Curve sample count (1); Own absolute air pressure. Numbers can have up to 48 characters, with a decimal point or e, and no thousands separators. Curves use 2 to 501 samples plus up to 16 section endpoints. Use up to 32 forces or sources and up to 16 sections. Springs take 1 to 20 periods with at least 8 samples per period; pendulum angles run from 0 to 179°. Magnus covers −40 to 35 °C over water and −40 to 0 °C over ice; relative humidity 0 to 100%, pressure 5 to 200 kPa, and vapor pressure must be below total pressure. Backup is limited to 1 MiB. Invalid, non-unique or unresolved data are rejected.
Model results
Results are numerical idealizations in SI units, shown with up to 10 digits; CSV keeps the numeric values and units. 9.80665 m/s² is the conventional standard g, not local gravity. Uncertainty in your inputs or the model is not estimated, and nothing here is a physical approval.
Download input backup
Calculation and backup stay in this browser. Workers stop after 15 seconds, or when you edit, reset or cancel. Inputs are never uploaded or stored. Input data, formulas and filenames are never sent. Only with your optional consent, Refentra sends aggregate counts of actions and outcomes, without input content.