What is a dry bulb temperature?
The dry bulb temperature is the air temperature that does not take into account any moisture content. An ordinary thermometer placed in or outside will measure the dry bulb temperature. The amount of humidity in the air, called relative humidity, cannot be determined only from the dry bulb temperature. Relative air humidity will be affected by materials that are dried by heated or overlapped outdoor air. Products such as tobacco, dried fruits, dried vegetables and dried meat are sensitive to dry bulbs and dew. Domestic and commercial air conditioning is designed for both expected dry air temperatures and humidity, as high temperature or humidity can extend the running time and reduce the efficiency of the cooling system.
A dry bulb should not be confused with dry air. The air, which is dry, contains very low humidity and therefore has a low dew point. The dry bulb temperature simply measures the air temperature without any humidity measurement and is often referred to as the ambient temperatureear or simply the temperature of the surroundings.
In the desert climate, evaporator coolers use low relative humidity of the outer air to evaporate water and cold living spaces by browsing large external air volumes through the wet cooling material. Evaporating coolers, often referred to as swamp coolers, require that both the high temperature of the dry bulb and the low dew temperatures work efficiently. Determination of evaporation cooling requires knowledge of three temperatures: dry bulb temperature, wet bulb temperature and dew point. The dew point temperatures can be obtained from local meteorological services and indicate the temperature at which the air is completely saturated. Visible fog on a wet day, n air cannot hold narrower moisture, is an example of saturated air.
Temperature measurement of dry bulb is relatively easy. Liquid or digital thermometer should be placed in place from the sun and from all heatedor chilled buildings. The thermometer should also be held further from dark drives or roads that can emit heat on sunny days. The thermometer should be achieved by a stable temperature before any measurement. In order to prevent false values, the thermometer should also not be kept or processed in the measurement.
Psychrometric graphs show the relationship between temperatures and humidity and are useful for determining relative humidity and dew point. After changing the dry bulb and wet bulb temperature, these two temperatures and psychrometric graph can be used to determine relative humidity. Simple device for measuring dry and wet bulb is a spotted psychrometer, which is a few thermometers connected to a chain or handle that can be manually rotated to achieve dry and wet light temperature at the same time.