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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This quantity is also known as the water vapor density. Archived copy as title Webarchive template wayback links. Molds and fungi can be controlled by keeping relative humidity low. It will also provide a number of other thermodynamic properties not found on a typical psychrometric chart. Instructions for the Psychrometric Calculator This on-line program calculates typical psychrometric state point properties.

Create psychrometric processes by plotting points then connecting them with process lines. At first glance there is little resemblance between the charts, but if the chart is rotated by ninety degrees and looked at in a mirror the resemblance becomes apparent. These are oblique lines drawn diagonally downward from left to right across the chart that are parallel to each other.

Psychrometric Chart + Duct Calculator

The range is from 0 for dry air up to 0. They are identically straight but are not exactly parallel to each other. What is the difference between the six different humidity metrics shown?

Such substances include cotton, paper, cellulose, other wood products, sugar, calcium oxide burned lime and many chemicals and fertilizers. WMO provides a page chapter on the measurement of temperature.

Also, you can create templates that you can reuse over and over again.

The horizontal component of the condition line is the change in sensible heat while the vertical component is the change in latent heat. In other projects Wikimedia Commons. The thermodynamic wet-bulb temperature is a thermodynamic property of a mixture of air and water vapor.


Humid heat is the constant-pressure specific heat of moist air, per unit mass of the dry air. The inner scale represents sensible-total heat ratio SHF. In meteorology and psychrometrics the word temperature by itself without a prefix usually means dry-bulb temperature. Usually the level at which water vapor changes into liquid marks the base of the cloud in the atmosphere hence called condensation level.

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Many substances are hygroscopicmeaning they attract water, usually in proportion to the relative humidity or above a critical relative humidity. It is not to be confused with Psychometry. A simplified definition is the temperature at which the water vapour turns into “dew” Chamunoda Zambuko Box Dayton, OH Email: The enthalpy coordinate is skewed and the lines of constant enthalpy are parallel and evenly spaced. Chzrt addition, you uniits double-tap a point to display the point properties and then edit them.

Chapter 2, Measurement of Temperature.


The accuracy of a simple wet-bulb thermometer depends on how fast air passes over the bulb and how well the thermometer is shielded from the radiant temperature of its surroundings. 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.

These are the horizontal lines on the chart. From Wikipedia, the free encyclopedia. The term dry-bulb is customarily added to temperature to distinguish it from wet-bulb and dewpoint temperature. Technically, psychrometroc temperature registered by psyychrometric dry-bulb thermometer of a psychrometer.

Free Online Interactive Psychrometric Chart

The mass of water vapor per unit volume of air containing the water vapor. Each line represents a constant temperature. 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.


Create an unlimited number of psychrometric chart projects. This program is provided for your psychrometrc without charge.

Mixtures of air and water vapor are the most common systems encountered in psychrometry. As you move your finger around the graph, the psychrometric properties at the top of the screen dynamically update.

Android app no longer available. Heating, ventilation and air conditioning. Ashrar outer scale gives the ratio of enthalpy difference to humidity difference.

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. This page was last edited on 3 Decemberat Why does this program show two different values of specific volume?

Load Calculation Applications Manual, 2nd ed. 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 program can output a listing of points and processes in a tabular report with calculated properties and energy values for each. These intersect the saturation curve at DBT point. Email a list of all the points and their properties for a completed chart, along with a PDF of the chart itself.