REQUIREMENTS
- Requires iOS 12.1 or later. Compatible with iPhone.
FEATURES
- Implements the latest mathematical models to simulate the physics of water, water vapor, moist air, dry air and ice.
- Calculates 39 psychrometric quantities of moist air, dry air, water, water vapor and ice.
- Allows for 17 combinations of thermodynamic properties to be entered.
- Validates each calculation informing the user of the range of values to be entered in case of an invalid input.
- Manages and converts results and inputs between the SI (metric) and I-P (English) System of Units.
- Results can be sent by email along with a comma-separated value (CSV) file.
DOWNLOADS
PsychroMoist performs high-precision calculations of Thermodynamic and Transport properties of humid air.
Given a combination of two thermodynamic properties of moist air and a value of pressure, it calculates 39 thermodynamic properties of moist air, dry air, water, water vapor and ice. It incorporates the latest mathematical models for the simulation of the physics of water vapor, dry air and moist air as real gases.
The numerical results obtained are suitable for scientific, industrial, HVAC, meteorology, engineering and related fields.
-
Performs all the calculations implementing the latest mathematical models used to generate the tables for moist air properties and thermodynamic properties of water in the 2009 ASHRAE Handbook of Fundamentals, namely:
- Thermodynamic and psychrometric property algorithms from the ASHRAE Research Project 1485.
- Properties of steam, water and ice from the Industrial Formulation IAPWS-IF97, the Scientific Formulation IAPWS-95, IAPWS Formulation 2008 and IAPWS Formulation 2006. Properties of dry air are from the NIST Reference equation of Lemmon et al.
-
Allows for 17 different combinations of thermodynamic properties to be entered as input parameters:
- Dry-bulb Temperature / Wet-bulb Temperature
- Dry-bulb Temperature / Dew Point Temperature
- Dry-bulb Temperature / Relative Humidity
- Dry-bulb Temperature / Humidity Ratio
- Dry-bulb Temperature / Specific Enthalpy
- Dry-bulb Temperature / Specific Volume
- Wet-bulb Temperature / Dew Point Temperature
- Wet-bulb Temperature / Relative Humidity
- Wet-bulb Temperature / Humidity Ratio
- Dew Point Temperature / Relative Humidity
- Dew Point Temperature / Specific Enthalpy
- Dew Point Temperature / Specific Volume
- Relative Humidity / Humidity Ratio
- Relative Humidity / Specific Enthalpy
- Relative Humidity / Specific Volume
- Humidity Ratio / Specific Enthalpy
- Humidity Ratio / Specific Volume
- Supports input parameters and calculation results in both the SI (metric) and the I-P (English) system of units.
- For each combination of input thermodynamic properties, it validates the appropriate input values in the valid range of computations.
- Results can be sent by email in an HTML file along with a comma-separated value (CSV) file.
SYSTEM OF UNITS
Psychrometric variables in the SI (metric) system of units can be entered and/or the calculation results can be displayed in the following units (w = water, da = dry air):
- Pressure: Pa, kPa, bar, mmHg
- Temperature: °C, K
- Humidity Ratio: kg(w)/kg)(da), g(w)/kg(da)
- Relative Humidity: [%]
- Absolute Humidity: kg(w)/m³
- Parts per million: ppm
- Specific Volume: m³/kg, m³/kg(da)
- Density: kg/m³
- Specific Enthalpy: kJ/kg(da), kJ/kg
- Specific Entropy: kJ/(kg(da)·K), kJ/(kg·K)
Psychrometric variables in the I-P (English) system of units can be entered and/or the calculation results can be displayed in the following units (w = water, da = dry air):
- Pressure: psi, inHg, inH2O, atm
- Temperature: °F, °R
- Humidity Ratio: lb(w)/lb(da), gr(w)/lb(da)
- Relative Humidity: [%]
- Absolute Humidity: lb(w)/ft³
- Parts per million: ppm
- Specific Volume: ft³/lb, ft³/lb(da)
- Density: lb/ft³
- Specific Enthalpy: Btu/lb(da), Btu/lb
- Specific Entropy: Btu/(lb(da)·°R), Btu/(lb·°R)
Output Variables
- Dry-Bulb Temperature
- Wet-Bulb Temperature
- Dew Point Temperature
- Moist Air Pressure
- Water Vapor Pressure
- Saturation Water Vapor Pressure
- Saturation Pressure at Wet-Bulb Temp
- Saturation Pressure at Dew Point Temp
- Dry Air Mole Fraction
- Water Mole Fraction
- Dry Air Mass Fraction
- Water Mass Fraction
- Humidity Ratio
- Saturation Humidity Ratio
- Relative Humidity
- Absolute Humidity
- Parts per million by weight
- Parts per million by volume
- Enhancement Factor
- Specific Volume of Dry Air
- Specific Volume of Moist Air
- Specific Volume of Saturated Water
- Specific Volume of Saturated Ice
- Specific Volume of Steam
- Density of Dry Air
- Density of Moist Air
- Density of Saturated Water
- Density of Saturated Ice
- Density of Steam
- Specific Enthalpy of Dry Air
- Specific Enthalpy of Moist Air
- Specific Enthalpy of Saturated Water
- Specific Enthalpy of Saturated Ice
- Specific Enthalpy of Steam
- Specific Entropy of Dry Air
- Specific Entropy of Moist Air
- Specific Entropy of Saturated Water
- Specific Entropy of Saturated Ice
- Specific Entropy of Steam
- Compressibility of Dry Air
- Compressibility of Moist Air
- Compressibility of Saturated Steam
Range of Input/Output Variables (SI)
|
Property |
Valid range |
Units |
|---|---|---|
|
Dry-bulb Temperature |
-143.15 ≤ Tdb ≤ 350 |
°C |
|
Wet-bulb Temperature |
-143.15 ≤ Twb ≤ 350 |
°C |
|
Dew Point Temperature |
-143.15 ≤ Tdp ≤ 350 |
°C |
|
Relative Humidity |
0 ≤ RH ≤ 100 |
[%] |
|
Humidity Ratio |
0 ≤ W ≤ 10 |
kg/kg |
|
Specific Enthalpy |
-311.357 ≤ h ≤ 32135.848 |
kJ/kg |
|
Specific Volume |
1.469E-3 ≤ v ≤ 3.055E5 |
m³/kg |
|
Pressure |
10 ≤ P ≤ 10.0E6 |
Pa |
Range of Input/Output Variables (I-P)
|
Property |
Valid range |
Units |
|---|---|---|
|
Dry-bulb Temperature |
-225.67 ≤ Tdb ≤ 662.0 |
°F |
|
Wet-bulb Temperature |
-225.67 ≤ Twb ≤ 662.0 |
°F |
|
Dew Point Temperature |
-225.67 ≤ Tdp ≤ 662.0 |
°F |
|
Relative Humidity |
0 ≤ RH ≤ 100 |
[%] |
|
Humidity Ratio |
0 ≤ W ≤ 10 |
lb/lb |
|
Specific Enthalpy |
-126.174 ≤ h ≤ 13823.61 |
Btu/lb |
|
Specific Volume |
2.353E-2 ≤ v ≤ 4.893E6 |
ft³/lb |
|
Pressure |
0.00145 ≤ P ≤ 1450.4 |
psi |
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