A convenient, precise and customizable psychrometric chart & calculator tool for 25 26 27 28 29 30 m^3/kg(d.a) 10% 20% 30% 40% 50% 60% 70%. Psychrometrics, psychrometry, and hygrometry are names for the field of engineering . The ASHRAE-style psychrometric chart, shown here, was pioneered by. Use chart to analyze processes involving moist Psychrometric chart: Example 1 . Given: T = 25°C . m wide x m long, and the boards are separated by.

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How to Read a Psychrometric Chart: 11 Steps (with Pictures)

The various lines shown in the chart are as follows please refer the figs below:. Using the Psychrometric Chart neatly plot the required air conditioning process and estimate a the amount of moisture removed [ Follow the interior curved lines to see various levels of relative humidity. The four equations highlighted above were programmed in MATLAB and used to plot the simplified psychrometric charts shown above.

Psychrometrics, psychrometry, and hygrometry are names for the field of engineering concerned with the physical and thermodynamic properties of gas-vapor mixtures.


This is used to establish the slope of a condition line between two processes. In meteorology and psychrometrics the word temperature by itself without a prefix usually means dry-bulb temperature. Technically, the temperature registered by the dry-bulb thermometer of a psychrometer. Changes in statesuch as when two air streams mix, can be modeled easily and somewhat graphically using the correct psychrometric chart for the location’s air pressure or elevation relative to sea level.


Since the dew point temperature of the air depends on the moisture content of the air, constant moisture lines are also constant DP temperature lines. Heating, ventilation and air conditioning. Identify the diagonal specific volume lines throughout the chart. This page was last edited on 3 Decemberat 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.

Psychrometric Chart Use

A simplified definition is the temperature at which the water vapour turns into “dew” Chamunoda Zambuko Views Read Edit View history. Look on the right side of the chart to find the vertical dew point line. At first appearence the psychrometric chart is quite confusing, however with some practice it becomes an extremely useful tool for rapidly evaluating air-conditioning processes. Architectural acoustics Architectural engineering Architectural technologist Building services engineering Building information modeling BIM Deep energy retrofit Duct leakage testing Environmental engineering Hydronic balancing Kitchen exhaust cleaning Mechanical engineering Mechanical, electrical, and plumbing Mold growth, assessment, and remediation Refrigerant reclamation Testing, adjusting, balancing.

Mixtures of air and water vapor are the psychrometricc common systems encountered in psychrometry. Various Lines and Curves in the Psychrometric Chart All the properties of air indicated in the psychrometric chart are calculated at the standard atmospheric pressure.

They are also available in low and high temperature ranges and for different pressures.

What is Psychrometric Chart? Introduction to Reading the Psychrometric Properties of Air

Archived copy as title Webarchive template wayback links. However, you can also use relative humidity, enthalpy, and specific volume to make estimated conclusions.


Together, they cited information from 12 referenceswhich can be found at the bottom of the page. Industries that use these materials are concerned with relative humidity control in production and storage of such materials. Cookies make wikiHow better.

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.

This quantity is also known as the water vapor density. Usually the level at which water vapor changes into liquid marks the base of the cloud in the atmosphere hence called condensation level.

Thus we introduce an oblique enthalpy axis and enthalpy black lines as follows: Each line psychrometgic a constant temperature. 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.

The vertical lines shown in the chart are the constant DB temperature lines and all the points located along a particular vertical line have same DB temperature. The dew point temperature is equal to the fully saturated dry bulb or wet bulb temperatures. What is Psychrometric Chart?