When consulting a psychrometric chart for evaporative cooling purposes, wet bulb temperature plays an integral role in regard to performance, helping to determine the minimum operating temperature required. When the moisture on the wet bulb evaporates, it lowers the temperature, and when there is less moisture in the air altogether, this process will be faster and result in an even colder reading. Depending on the amount of humidity present, the evaporation rate on the wet bulb and temperature differences between the two forms of bulb readings will vary. Wet bulb temperature has essentially the reverse effect of this process, involving covering the bulb of the thermometer with a wet cloth before taking a temperature reading. The Dry bulb temperature refers to the ambient air temperature, which remains unaffected by air moisture, and this variable is shown as the horizontal axis of a psychrometric chart.
This involves the analysis of ambient air temperature. Dry Bulb Temperature (DBT) and Wet Bulb Temperature (WBT)ĭry bulb temperature refers to the use of a traditional thermometer, as its bulb possesses no moisture. Measurements are made in BTU per pound of dry air in the U.S, while elsewhere in the world it is measured in Joules per kilogram. Enthalpy can be found on a psychrometric chart in the form of diagonal lines, in most cases. This means that all heat, including that which has been generated by dry air and water vapor, is included. Total heat – otherwise known as enthalpy - represents the amount of heat energy in the air. It is normally designated as “W” on the chart.
Moisture Content and Total Heat (Enthalpy)Īlso known as the humidity ratio and illustrated as the vertical axis of a psychrometric chart, moisture content represents the mass of water vapor per unit mass of dry air. This guide will examine the variables in question that are typically included. When the need arises to address air moisture, a psychrometric chart can be created to present a visual representation of factors contributing toward water moisture in the air of an environment. Humans require air with a specific amount of moisture in order to remain healthy, safe, and comfortable indoors, which is where proper humidity control comes into play as a contributing factor. In atmospheric conditions, water vapor content in air typically varies between 0% and 3% by mass. Psychrometry involves the study of moisture content in the air. Your Guide to Psychrometric Chart Properties
Carrier psychrometric chart high temperature series#
TE Series Ceiling Mounted Evaporative Humidifier.
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