Android app no longer available. By using this site, you agree to the Terms of Use and Privacy Policy. Not to be confused with Psychometricsa discipline of psychology and education. The protractor on the upper left of the chart has two scales. Common atmospheric pressure values are:. This page was last edited on 3 Decemberat Asshrae you move your finger around the graph, the psychrometric properties at the top of the screen dynamically update.
However, no warranty, either expressed or implied, is given with respect to the accuracy or the sufficiency of the information provided herein, and the user must assume all risks and responsibility in connection with the use thereof. Such substances include cotton, paper, cellulose, other wood products, sugar, calcium oxide burned lime and many chemicals and fertilizers.
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These cookies do not store any personal information. This website uses cookies to improve your experience. She looked a bit rumpled after a couple of days in jail, but she was totally calm.
Apart from the annoyance she showed when they took her from the hospital waiting room, she had exhibited an exceedingly well-controlled facade.
You take care of yourself, okay. His hand touched his belt, but then drew away, leaving the pithons at his waist still coiled inside their little nests.
He stood and gazed down, over the curved empty territory of the vertical world. A bright, cold wind surged against his face, stinging his throat and lungs as he drank it in. Of Father, all I told him for now was that he was long dead, killed during the French occupation of Porto. Psychrometrics , psychrometry , and hygrometry are names for the field of engineering concerned with the physical and thermodynamic properties of gas-vapor mixtures.
Although 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, ventilation, and air-conditioning and meteorology. In human terms, our thermal comfort is in large part a consequence of not just the temperature of the surrounding air, but because we cool ourselves via perspiration the extent to which that air is saturated with water vapor.
Many substances are hygroscopic , meaning they attract water, usually in proportion to the relative humidity or above a critical relative humidity. Such substances include cotton, paper, cellulose, other wood products, sugar, calcium oxide burned lime and many chemicals and fertilizers. Industries that use these materials are concerned with relative humidity control in production and storage of such materials.
The horizontal component of the condition line is the change in sensible heat while the vertical charr is the change in latent heat. Archived copy as title Webarchive template wayback links. This quantity is also known as the water vapor density. In many industrial applications it is important to avoid condensation that would ruin product or cause corrosion.
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A chart is valid for a given air pressure or elevation above sea level. Mixtures of air and water vapor are the most common systems encountered in psychrometry. Each line represents asjrae constant temperature.
The value indicated by a wet-bulb thermometer often provides an adequate approximation of the thermodynamic wet-bulb temperature. Views Read Edit View history. This property of air-water vapor systems simplifies drying and cooling unigs often performed using psychrometic relationships.
Industries that use these materials are concerned with relative humidity control in production and storage of such materials. Purchase Understanding Psychrometrics, 3rd ed. Psychromeyric dew point unjts is equal to the fully saturated dry bulb or wet bulb temperatures. 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.
As you move your finger around the graph, the psychrometric properties at the top of the screen dynamically update. New in the Third Edition: Sea Level Pressure — In addition, you can double-tap a point to display the point properties and then edit them. The thermodynamic wet-bulb temperature is a thermodynamic property of a psychrometri of air and water vapor.
This page was last edited on 3 Decemberat Heating, ventilation and air conditioning.
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