ASHRAE PSYCHROMETRIC CHART NO NORMAL TEMPERATURE. BAROMETRIC PRESSURE: INCHES OF MERCURY. Copyright 0. 5. DRY BULB TEMPERATURE – °C. 5. Psychrometric Charts . .. . ASHRAE Fundamentals Handbook (SI) Mass of water added per unit mass of dry air is (W.* – W), which.

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Not to be confused with Psychometricsa discipline of psychology and education. You show a ‘Virtual’ Temperature under Thermodynamic properties. They are also available in low and high temperature ranges and for different pressures.

It is not to be confused with Psychometry.

The inner scale represents sensible-total heat ratio SHF. The saturation temperature of the moisture present in the sample of air, it can also be defined as the temperature at which the vapour changes into liquid condensation. Default when Elevation is selected User may override default input by selecting and entering new value. Please send correspondence to: Purchase Understanding Psychrometrics, 3rd ed.

The psychrometric ratio of air-water vapor mixtures is approximately unity, which implies that the difference between the adiabatic saturation temperature and wet bulb temperature of air-water vapor mixtures is small. These lines are oblique lines ashraw differ slightly from the enthalpy lines.

Easily plot HVAC and other psychrometric processes while out in the field, save the graphs, and then email the graph and results to yourself or clients. Analogous to the specific volume of a pure substance.

Archived from the original on The psychrometric ratio is an important property in the area of psychrometry, as it relates the absolute humidity and saturation humidity to the difference between the dry bulb temperature and the adiabatic saturation temperature. In other projects Wikimedia Commons. Chapter 2, Measurement of Temperature. The protractor on the upper left of the chart has two scales. Mixtures of air and water vapor are the most common systems encountered in psychrometry. This quantity is also known as the water vapor density.


Analogous to the specific enthalpy of a pure substance. The thermodynamic wet-bulb temperature is a thermodynamic property of a mixture of air and water vapor. The range is from 0 for dry air up to 0.


In industrial drying applications, such as drying paper, manufacturers usually try to achieve an optimum between low relative humidity, which increases the drying rate, and energy usage, which decreases as exhaust relative humidity increases. Why does this program show two different values of specific volume? It will also provide a number of other thermodynamic properties not found on a typical psychrometric chart. 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.

The outer scale gives the ratio of enthalpy difference to humidity difference. Specific humidity is defined as the proportion of the mass of water vapor and mass of the moist air sample including both dry air and the water vapor ; it is closely related to humidity ratio and always lower in value. Psychrometrics, psychrometry, and hygrometry are names for the field of engineering concerned with the physical and thermodynamic properties of gas-vapor mixtures. It may be evaluated with the following equation: This page was last edited on 3 Decemberat Pressure Liquid water Avogadro’s law Nucleation Thermodynamic equilibrium.


The value indicated by a wet-bulb thermometer often provides an adequate approximation of the thermodynamic wet-bulb temperature. The enthalpy coordinate is skewed and the lines of constant enthalpy are parallel and evenly spaced.

Heating, ventilation and air conditioning. The ratio of the vapor pressure of moisture in the sample to the saturation pressure at the dry bulb temperature of the sample. In addition, you can double-tap a point to display the point properties and then edit them.

A simplified definition is the temperature at which the water vapour turns into “dew” Chamunoda Zambuko Such substances include cotton, paper, cellulose, other wood products, sugar, calcium oxide burned lime and many chemicals and fertilizers.

These lines are drawn straight, not always parallel to each other, and slightly inclined from the vertical position. In meteorology and psychrometrics the word temperature by itself without a prefix usually means dry-bulb temperature. This is the t —axis, the abscissa horizontal axis.

Dayton ASHRAE On-Line Psychrometrics

Display a fully customizable psychrometric chart in both landscape and portrait modes. Psychrometrics Humidity and hygrometry Heating, ventilating, and air conditioning. The “Mollier i – x ” Enthalpy – Humidity Mixing Ratio diagram, developed by Richard Mollier in[12] is an alternative psychrometric chart, preferred by many users in Scandinavia, Eastern Europe, and Russia. Archived copy as title Webarchive template wayback links.

Also, create custom labels anywhere on the chart. Box Dayton, OH Email: Create an unlimited number of psychrometric chart projects.