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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The enthalpy coordinate is skewed and the lines of constant enthalpy are parallel and evenly spaced. The various lines shown in the chart are as chatr please refer the figs below: Use a ruler to locate other measurements at the point of intersection.

Around the extremes of the chart and just outside of the saturation curve, locate the diagonal scales which uhve enthalpy in BTU per pound of dry air. On the chart, you will notice various lines that follow psychromdtric curve of the saturation curve. The underlying psychrometric parameter data for the psychrometric chart and the Mollier diagram are identical.

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.

Analogous to the specific volume of a pure substance. The horizontal lines starting from this vertical scale are constant moisture lines. These are the horizontal lines on the chart. WMO provides a page chapter on the measurement of temperature.



Knowing both the dry-bulb temperature DBT and wet-bulb temperature WBTone can determine the relative humidity RH from the psychrometric chart appropriate to the air pressure. 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.

In many industrial applications it is important to avoid condensation that would ruin product or cause corrosion. This type of cooler is extremely popular in hot, dry climates, and is popularly known as a Swamp Cooler. This property of air-water vapor systems simplifies drying and cooling calculations often performed using psychrometic relationships.

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

A chart is valid for a given air pressure or elevation psychrometrjc sea level. Notice that on the saturation curve the wet and dry bulb temperatures have the same values. This article was co-authored by our trained team of editors and researchers who validated it for accuracy and comprehensiveness.

A wikiHow Staff Editor reviewed this article to make sure it’s helpful and accurate. Locate the uppermost curved line on the chart to find the saturation curve.


Find the diagonal enthalpy scales surrounding the chart. All the points located along the constant WB temperature jhve have the same temperature. Follow the interior curved lines to see various levels of relative humidity.

This will help when it comes time to use the measurements in an equation. The value indicated by a wet-bulb thermometer often provides an adequate approximation of the thermodynamic wet-bulb temperature. However, you can also use relative humidity, enthalpy, and specific volume to make estimated conclusions. Views Read Edit View history. These are not parallel to wet bulb temperature lines.

Find the humidity ratio labeled on the right vertical axis.

Psychrometrics Humidity and hygrometry Heating, ventilating, and air conditioning. Archived copy as title Webarchive template wayback links.

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

The saturation temperature pwychrometric 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 is the series of articles that describes psychrometric chart and various psychrometric processes like sensible heating, sensible cooling, humidification, de-dumidification, evaporative cooling etc. The mass of water vapor per unit volume of air containing the water vapor.