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Humans require air with a specific amount of moisture in order to remain healthy, safe, and comfortable indoors, which is where proper humidity control comes into play as a contributing factor. In atmospheric conditions, water vapor content in air typically varies between 0% and 3% by mass.

Psychrometry involves the study of moisture content in the air. Your Guide to Psychrometric Chart Properties

Humidification for Human Resources Managers.

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TE Series Ceiling Mounted Evaporative Humidifier.Kretzschmar, H.-J.: International Steam Tables. Pruß, A.: The IAPWS Formulation 1995 for the Thermodynamic Properties of Ordinary Water Substance for General and Scientific Use. Sauer, H.J.: Formulation of High-Temperature Properties for Moist Air. G.: Thermodynamic Properties of Air and Mixture of Nitrogen, Argon, and Oxygen from 60 to 2000 K at Pressures to 2000 MPa. Gatley, D.P.: Determination of Thermodynamic and Transport Properties for Humid Air for Power-Cycle Calculations. Gatley, Donald P.: Thermodynamic properties of real moist air, dry air, steam, water, and ice (RP-1485). American Society of Heating Owen, Mark.Specific Volume of Saturated Water Vapor (for T ≤ 273.15 K / 32 ☏ ).Specific Entropy of Saturated Water Vapor (for T ≤ 273.15 K / 32 ☏ ).Specific Enthalpy of Saturated Water Vapor (for T ≤ 273.15 K / 32 ☏ ).Specific Volume of Saturated Water Vapor (for T ≥ 273.15 K / 32 ☏).Specific Volume of Saturated Liquid Water.Specific Entropy of Saturated Water Vapor (for T ≥ 273.15 K / 32 ☏).Specific Entropy of Saturated Liquid Water.

Specific Enthalpy of Saturated Water Vapor (for T ≥ 273.15 K / 32 ☏).

Specific Enthalpy of Saturated Liquid Water.

Specific Isobaric Heat Capacity of Humid Air.

Mass Fraction of Wate Vapor in Humid Air.

Mole Fraction of Water Vapor in Humid Air.

Partial Saturation Water Vapor Pressure.

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:.

NET, C++, C# framework development environments.

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Royalty free distribution for unlimited Windows applications.