Wet Bulb Dry Bulb Psychrometric Chart

Altitude above sea level m.

Wet bulb dry bulb psychrometric chart.

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. 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. Wet bulb temp c.

Now we are going to learn two of those axis dry bulb temperature and wet bulb temperature. Dry bulb temp c. Enter dry bulb temperature plus either wet bulb temp rh or dewpoint temp. Dry bulb temperature and 57 c wet bulb temperature experiences a temperature drop of 3 c as it passes through the 1 2 m wide stack of lumber.

The relative humidity is approximately 50 the humidity ratio is approximately 65 grains h2o lb dry air. Two independent intensive properties are required to completely specify the state of air in the psychrometric chart. If the air is flowing. Dry wet bulb temperature axis on psychrometric chart.

When we know dry bulb temperature and wet bulb temperature. 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. Relative humidity temperature in. 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.

By combining the dry bulb and wet bulb temperature in a psychrometric chart or mollier diagram the state of the humid air. Determine the properties of the air at state point 2 and compare them with those at state point 1. The psychrometric chart gives the relative humidity for a given wet bulb and dry bulb temperature. 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.

Psychrometric chart includes so many axis which represent different parameters of air. A process in which there is no change of dry bulb temperature. By definition wet bulb temperature is the lowest temperature a portion of air can acquire by evaporative cooling only. Relative humidity dewpoint 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. Since this temperature is so commonly used assume that temperatures are dry bulb temperatures unless otherwise designated.