Wet Bulb And Dry Bulb Temperature Chart

By definition wet bulb temperature is the lowest temperature a portion of air can acquire by evaporative cooling only. The temperature of the air measured by the ordinary thermometer is called as the dry bulb temperature of air commonly referred as dbt. The wet bulb temperature is always lower than the dry bulb temperature but will be identical with 100 relative humidity the air is at the saturation line.

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The wet bulb temperature wbt is the temperature read by a thermometer covered in water soaked cloth wet bulb thermometer over which air is passed.

Wet bulb and dry bulb temperature chart.

Read enthalpy values in psychrometric chart example. The dbt and wbt of the air are measured by a special thermometer called sling thermometer. Temperature of the ordinary air measured by the thermometer when it is covered by wet cloth or wick is called as the wet bulb temperature commonly referred to as wbt. At 100 relative humidity the wet bulb temperature is equal to the air temperature dry bulb temperature.

It is therefore measured by wrapping a wet wick around the bulb of a thermometer and the measured temperature corresponds to the wet bulb temperature. 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. Wet bulb temperature can be measured by using a thermometer with the bulb wrapped in wet muslin. Draw a vertical line from dry bulb temperature axis at 30 0 c line 1.

Dry bulb temperature is 30 0 c and wet bulb temperature is 25 0 c. Calculate the enthalpy of that air. The dry bulb temperature is the ambient temperature. Draw the line of 25 0 c of wet bulb temperature axis line 2.

At lower humidity the wet bulb temperature is lower than dry bulb temperature because of evaporative cooling. When dry bulb temperature and wet bulb temperature are known we can determine the relative humidity absolute humidity and enthalpy. Wet bulb temperature is the lowest temperature to which air can be cooled by the evaporation of water into the air at a constant pressure. When we know dry bulb temperature and wet bulb temperature.

The relative humidity is approximately 50 the humidity ratio is approximately 65 grains h2o lb dry air. It is defined as air. The wet bulb temperature is the adiabatic saturation temperature. Dry bulb temperature tells the actual room temperature.

Combining the dry bulb and wet bulb temperature in a psychrometric diagram or mollier chart gives the state of the humid air. The adiabatic evaporation of water from the thermometer bulb and the cooling effect is indicated by a wet bulb temperature lower than the dry bulb temperature in the air. Psychrometric chart full tutorial dry bulb temperature t db. 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.

Enthalpy is measured by kj kg dry air.

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