Wet Bulb Dry Bulb Psychrometric Chart

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.

Wet bulb dry bulb psychrometric chart.

Relative humidity temperature in. 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 wet bulb temperature axis on psychrometric chart. When we know dry bulb temperature and wet bulb temperature.

Enter dry bulb temperature plus either wet bulb temp rh or dewpoint temp. Dry bulb temperature is located on the horizontal or x axis of the psychrometric chart and lines of constant temperature are represented by vertical chart lines. The relative humidity is approximately 50 the humidity ratio is approximately 65 grains h2o lb dry air. When dry bulb and wet bulb temperatures of the air are known the dew point temperature can be plotted on the psychrometric chart fig.

Properties of atmospheric air such as the dry bulb temperature the wet bulb temperature the dew point temperature the specific humidity the relative humidity specific enthalpy and specific volume are discussed in relation to the psychrometric chart below. It includes a dry bulb thermometer a wet bulb thermometer and a psychrometric chart a graph that plots the relationships between the dry and wet bulb temperature relative humidity and dew point at constant pressure. Example the state of air in the psychrometric chart. Psychrometric chart includes so many axis which represent different parameters of air.

The higher its dew point temperature. A process in which there is no change of dry bulb temperature. Determine the properties of the air at state point 2 and compare them with those at state point 1. Wet bulb temp c.

The state of air with dry bulb temperature 75 o f and wet bulb temperature 62 5 o f can be visualized in the psychrometric chart as indicated below. Relative humidity dewpoint temp c. Two independent intensive properties are required to completely specify the state of air in the psychrometric chart. The psychrometric chart gives the relative humidity for a given wet bulb and dry bulb temperature.

The temperature read directly on an ordinary thermometer. Since this temperature is so commonly used assume that temperatures are dry bulb temperatures unless otherwise designated. Dry bulb temp c. If the air is flowing.

By definition wet bulb temperature is the lowest temperature a portion of air can acquire by evaporative cooling only. Altitude above sea level m.