Wet Bulb Dry Bulb Psychrometric Chart

You can enter also altitude that is necessary to make corrections for the atmospheric pressure.

Wet bulb dry bulb psychrometric chart.

By combining the dry bulb and wet bulb temperature in a psychrometric chart or mollier diagram the state of the humid air. This psychrometric calculator provides web bulb temperature and other psychrometric calculation in addition to a psychrometric chart. Wet bulb temperature is the temperature of the air as measured by an ordinary thermometer whose glass bulb is covered by a wet cloth or gauze represented by oblique lines at small angle 3. Wet bulb temp c.

As another example let s say you know that the wet bulb temper ature is 50 and the dry bulb temper ature is 75. Psychrometric chart includes so many axis which represent different parameters of air. Psychrometric chart the psychrometric chart displays the relationship between dry bulb wet bulb and dew point temperatures and specific and relative humidity. 575 1 262 159 38 3813 12 5 82 65 470 13 10 85 0 4 39 24 10 17 5 8773 043 35210 88 77 64 43 32 21 11 0 80 700 0 42 37 22 123 91 82 73 65 36 479 31 3 15.

Relative humidity dewpoint temp c. To use the chart take the point of intersection of the lines of any two. Enter dry bulb temperature plus either wet bulb temp rh or dewpoint temp. Table 1 psychrometric chart of relative humidity in percent depression of the wet bulb dry bulb temperature minus wet bulb temperature in c 0 5 1 0 1 5 2 0 1 5 3 0 3 5 4 0 6 5 0 75 10 0 12 5 15 0 17 5 210 1 22 5 25 0 200 111 7.

The wet bulb temperature is the temperature of an object that can be achieved through evaporative cooling assuming good air flow and that the ambient air temperature remains the same. Dry bulb temp c. Dry bulb temperature is the temperature of the air as measured by an ordinary thermometer represented by vertical line on chart 2. Plot the state point and read the rest of the parameters.

Now we are going to learn two of those axis dry bulb temperature and wet bulb temperature. Either wet bulb temperature or relative humidity can be selected as input. Dry wet bulb temperature axis on psychrometric chart. The psychrometric chart gives the relative humidity for a given wet bulb and dry bulb temperature.

Altitude above sea level m. To use find the vertical line for the dry bulb temperature at the bottom of the chart and the slanted line for the wet bulb temperature at the curved top left edge.