How To Use Psychrometric Chart

Locate the dry bulb tem perature along the bottom axis and the associated vertical line for each temperature. Wet bulb temperature and enthalpy use the same chart line but values are read off seperate scales. Autoplay when autoplay is enabled a suggested video will automatically play next.

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How To Read A Psychrometric Chart 11 Steps With Pictures

Chapter 10b The Psychrometric Chart Updated 7 22 2014

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To detect air temperature and humidity problems you also need to understand how the psychrometric chart works.

How to use psychrometric chart. Extend the vertical line constant db temperature line from 78o and the diagonal. The psychrometric chart comprises a dry bulb temperature scale on the horizontal axis moisture ratio scale on the vertical axis. Use figures 2 and 3 with the psychrometric chart in figure 1 to verify whether you can find each air property.

A rh b tdp c hr d v e h. Pick any 2 known measurements available and plot them on the chart where the lines intersect. Theory and application perry peralta nc state university.

The psychrometric chart and its use psychrometry is an impressive word which is defined as the measurement of the moisture content of air. In broader terms it is the science and practices associated with atmospheric air mixtures their control and the effect on materials and human comfort. Example showing how to use psychrometric chart.

In this video detail method to draw psychrometric chart is explained. Psychrometric chart identify parts of the chart determine moist air properties use chart to analyze processes involving moist air. Normally you should give preference to measurements of dry temperature absolute humidity dew point or vapor pressure.

This guide is an easy 8 step framework designed to demystify the psychrometric chart. The key is to determine which interest. Locate wb temperature of 65of on the saturation curve scale.

On the psychrometric chart locate value 78of on the db temperature scale located at the bottom of the chart. T 25 c tw 20 c required. This scale will be in degrees f or degrees c.

Some practice with examples will help. Locate the humidity ratio along the right vertical axis. Another psychrometric chart use we use the psychro chart in an entirely different way.

It represents a curved boundary saturated air or 100 percent moisture retention capacity. Comments are turned off. Properties of moist air on a psychrometric chart.

When solving a problem involving a psychrometric chart you only need 2 measurements to read the chart. Using the chart variation that has passive strategies and a comfort zone mapped on it as the initial phase of passive solar nze design we chart monthly temps and humidities on the chart and instantly get a graphic which tells us what passive strategies are appropriate to make a comfortable nze building.