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Measuring Humidity
The instruments used to measure humidity are called hygrometers. The simplest form of hygrometer is called a psychrometer. It consists…
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Measuring Wet Bulb Temperature
Wet bulb temperature is easily measured with a standard thermometer which has its sensing bulb encased in a wetted wick…
HVAC 2 min read
MEASURING PSYCHROMETRIC VARIABLES
All psychrometric properties of air are determined by measuring two psychrometric variables: for example, if wet- and dry-bulb temperatures are…
HVAC 2 min read
Vapour Pressure
Water vapour is one of several gaseous constituents of air, the other principal ones being nitrogen, oxygen and carbon dioxide.…
HVAC 1 min read
Specific Air Volume
Specific Volume is the volume that a certain weight of air occupies at a specific set of conditions. The specific…
HVAC 1 min read
Absolute Humidity or Humidity Ratio
Absolute Humidity is the vapor content of air, given in grams or lb of water vapor per lb of dry…
HVAC 2 min read
Relative Humidity (RH)
Relative humidity (RH) is a measure of the amount of water air can hold at a certain temperature. Air temperature…
HVAC 1 min read
Temperature: Wet Bulb
The wet bulb temperature (WBT) is a temperature associated with the moisture content of the air. Wet bulb temperature is…
HVAC 1 min read
READING PSYCHROMETRIC CHART
To the novice, a psychrometric chart seems a dizzying maze of lines and curves going every which way, but once…
HVAC 2 min read
Psychrometric Chart
The Psychrometric Chart provides a graphic relationship of the state or condition of the air at any particular time. It…
HVAC 1 min read
PSYCHROMETRICS
Psychrometrics is the science of studying the thermodynamic properties of moist air. The amount of moisture vapour in the air…