How To Find Specific Humidity Using Psychrometric Chart

You are provided a psychrometric chart which is designed for 101325 10 5 pa. Locate the humidity ratio along the right vertical axis.

Chapter 10b The Psychrometric Chart Updated 7 22 2014

how to find specific humidity using psychrometric chart

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On the right of the chart youll find the dew point line and the vapor pressure line on the right of that.

How to find specific humidity using psychrometric chart. The psychrometric chart shows graphically the parameters relating to water moisture in air. Moving to the right until the end of the diagram we find the absolute humidity vertical line. Well now continue the example of the previous chapter with air at 200c with 60.

Dry bulb temperature relative humidity moisture content dew point temperature enthalpy humid air volume and wet bulb temperature. One of the major applications of the psychrometric chart is in air conditioning and we find that most humans feel comfortable when the temperature is between 220c and 270c and the relative humidity f between 40 and 60. If you know the relative humidity and the temperature you can calculate using a psychrometric chart or a table what is the specific humidity.

The total pressure in the room is 089214 10 5 pa. And you are said to find relative humidity of a room using given chart. This scale will be in degrees f or degrees c.

The total pressure and psychrometric chart design pressure is not same. But air is never dry even in a desert. The straight diagonal lines show specific volume lines.

Relative humidity rh. From the psychrometric chart we can find out the specific volume of the required air and find the total volume of the required air by multiplying it with the total weight of the air required. This application note describes the purpose and use of the psychrometric chart as it affects the hvac engineer or technician.

Explains how to read on a psychrometric chart. A psychrometric chart is drawn against two fundamental dimensions dry bulb temperature and humidity ratio. Absolute humidity on the psychrometric chart.

This guide is an easy 8 step framework designed to demystify the psychrometric chart. Air comprises approximately 78 nitrogen 21 oxygen and 1 other gases. For more tips including how to draw conclusions from specific parameters on a psychometric chart read on.

On the vertical line corresponding to the temperature of 200c we go up until we reach the 60 hr curve. How to use a psychrometric chart. We can use a psychrometric chart to determine the other properties of a moist air.

Locate the dry bulb tem perature along the bottom axis and the associated vertical line for each temperature. Then the specific humidity will. The interior curved lines represent various levels of relative humidity.

Say the temperature is 15 c and the relative humidity is 100 percent. This defines the comfort zone which is portrayed on the psychrometric chart as shown below.

Chapter 10b The Psychrometric Chart Updated 7 22 2014