Humid heat is the constant-pressure specific heat of moist air, per unit mass of the dry air. The mass of water vapor per unit volume of air containing the water vapor. The underlying psychrometric parameter data for the psychrometric chart and the Mollier diagram are identical. Sea Level Pressure – This page was last edited on 3 Decemberat The psychrometric chart allows all the parameters of some moist air to be determined from any three independent parameters, one of which must be the pressure. Such substances include cotton, paper, cellulose, other wood products, sugar, calcium oxide burned lime and many chemicals and fertilizers. The program on the CD allows the user to plot typical psychrometric processes and perform the corresponding energy calculations on-screen, without having to first print out the individual charts. Dayton ASHRAE On-Line PsychrometricsĬreate an unlimited number of psychrometric chart projects. Retrieved 18 September There appears to be error in the calculations when converting from one unit system to another. The ratio of the vapor pressure of moisture in the sample to the saturation pressure at the dry bulb temperature of the sample. In industrial drying applications, such as drying paper, manufacturers usually try to achieve an optimum between low ashraw humidity, which increases the drying rate, and energy usage, which decreases as exhaust relative humidity increases. ASHRAE Fundamentals Handbook (SI) Mass of water added per unit mass of dry air is (W.* – W), which.
ASHRAE PSYCHROMETRIC CHART NO NORMAL TEMPERATURE.
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