Wet Bulb Dry Bulb Psychrometric Chart

Wet bulb temp c.

Wet bulb dry bulb psychrometric chart.

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. The higher its dew point 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. Enter dry bulb temperature plus either wet bulb temp rh or dewpoint temp.

Relative humidity temperature in. Determine the properties of the air at state point 2 and compare them with those at state point 1. The temperature read directly on an ordinary thermometer. By combining the dry bulb and wet bulb temperature in a psychrometric chart or mollier diagram the state of the humid air.

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. Dry bulb temp c. Since this temperature is so commonly used assume that temperatures are dry bulb temperatures unless otherwise designated. 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.

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

If the air is flowing. When we know dry bulb temperature and wet bulb temperature. When dry bulb and wet bulb temperatures of the air are known the dew point temperature can be plotted on the psychrometric chart fig. 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.

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. 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. The psychrometric chart gives the relative humidity for a given wet bulb and dry bulb temperature.

Example the state of air in the psychrometric chart. A process in which there is no change of dry bulb temperature.