HVAC 2 min read
Humidification (Heating or Cooling)
This is the process of introducing moisture into the airstream. In winter, humidification frequently is required because the cold outside…
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HVAC 1 min read
Governing Equation for Sensible Heating and Cooling
Example Calculate the amount of sensible heat that must be added to 100lb of air at 85°F dry bulb and…
HVAC 2 min read
Sensible Heating
In HVAC systems, air is typically heated by passing it over a heating coil or use of electrical strip heaters.…
HVAC 2 min read
Sensible Cooling
Air dew point temperature Tdewpoint is the temperature when air is 100% saturated and water begins to condense out of the…
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…
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…
