HVAC 1 min read
Cooling and Heating
In HVAC systems, air is typically cooled by passing it over a cooling coil. Most cooling coils are finned-tube heat…
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HVAC 2 min read
Measuring Vapour Pressure
Measuring vapour pressure is very difficult without complex laboratory instrumentation. However, it can be relatively easily derived from more measurable…
HVAC 1 min read
Measuring Dew Point
Two types of dew point sensors are commonly used today: a condensation dew point method and a saturated salt system.…
HVAC 2 min read
Measuring Humidity
The instruments used to measure humidity are called hygrometers. The simplest form of hygrometer is called a psychrometer. It consists…
HVAC 3 min read
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…