Partial Pressure of Dry Air in Humid Air.Partial Pressure of Water Vapor in Humid Air.Specific Isobaric Heat Capacity: Btu/(lb.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): Specific Isobaric Heat Capacity: J/(kg.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): Valid range for Humid Air Properties - Psychrometrics. The valid range of calculations for thermodynamic and psychrometric properties is defined by the IAPWS (International Association for the Properties of Water and Steam) as shown on Figure 1.įigure 1. For each combination of input thermodynamic properties validates the range of input variables.Supports input parameters and calculation results in both the SI (metric) and I-P (English) system of units.Dew Point Temperature / Specific Volume.Dew Point Temperature / Specific Enthalpy.Dew Point Temperature / Relative Humidity.Wet-bulb Temperature / Relative Humidity.Wet-bulb Temperature / Dew Point Temperature.Dry-bulb Temperature / Specific Enthalpy.
Dry-bulb Temperature / Relative Humidity.Dry-bulb Temperature / Dew Point Temperature.Dry-bulb Temperature / Wet-bulb Temperature.Allows for 17 different combinations of thermodynamic properties to be entered as input parameters:.Properties of dry air are from the NIST Reference equation of Lemmon et al. Properties of steam, water and ice from the Industrial Formulation IAPWS-IF97, the Scientific Formulation IAPWS-95, IAPWS Formulation 2008 and IAPWS Formulation 2006.Thermodynamic and psychrometric property algorithms from the ASHRAE Research Project 1485.Performs all the calculations implementing the latest mathematical models used to generate the tables for humid air properties and thermodynamic properties of water in the 2009 ASHRAE Handbook of Fundamentals, namely:.
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