Molds and fungi can be controlled by keeping relative humidity low.
This property of air-water vapor systems simplifies drying and cooling calculations often performed using psychrometic relationships.īy using this site, you agree to the Terms of Use and Privacy Policy. As you move your finger around the graph, the psychrometric properties at the top of the screen dynamically update. Pressure Liquid water Avogadro’s law Nucleation Thermodynamic equilibrium.Ĭreate an unlimited number of psychrometric chart projects. These lines are drawn straight, not always parallel to each other, and slightly inclined from the vertical position.Īlthough the principles of psychrometry apply to any physical system consisting of gas-vapor mixtures, the most common system of interest is the mixture of water vapor and air, because of its application in heating, ventilating, and air-conditioning and meteorology. Psychrometrics, psychrometry, and hygrometry are names for the field of engineering concerned with the physical and thermodynamic properties of gas-vapor mixtures.
The mass of water vapor per unit volume of air containing the water vapor. The region above the saturation curve is a two-phase region that represents a mixture of saturated moist air and liquid water, in thermal equilibrium. Industries that use these materials are concerned with relative humidity control in production and storage of such materials. Create psychrometric processes by plotting points then connecting them with process lines.
#Ashrae psychrometric chart no 1 imperial manual#
Understanding Psychrometrics serves as a lifetime reference manual and basic refresher course for those who use psychrometrics on a recurring basis and provides a four- to six-hour psychrometrics learning module to students air-conditioning designers agricultural, food process, and industrial process engineers meteorologists and others.Ī chart is valid for a given air pressure or elevation above sea level. Purchase Understanding Psychrometrics, 3rd ed. From any two independent ones of the six parameters dry bulb temperature, wet bulb temperature, relative humidity, humidity ratio, specific enthalpy, and specific volume, all the others can be determined. Mixtures of air and water vapor are the most common systems encountered in psychrometry. COPYRIGHT AMERICAN.Īrchived copy as title Webarchive template wayback links. ASHRAE PSYCHROMETRIC CHART NO NORMAL TEMPERATURE. ASHRAE PSYCHROMETRIC CHART NO.1 D AT N U R PO PE M R 45 TE PE N TU O 65 TI -B HUMIDITY RATIO – POUNDS MOISTURE PER POUND.
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