HVAC 1 min read
Adiabatic Processes
The term ‘Adiabatic’ simply means without energy loss or gain. This refers mainly to the processes of evaporative cooling and…
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HVAC 3 min read
Evaporative Cooling
Evaporative cooling is an adiabatic process, that is, there is no net heat loss or gain. When hot air stream…
HVAC 2 min read
Heating and Dehumidification (Chemical Dehydration)
Heating and Dehumidification, also referred to as “chemical dehydration” is seeing increasing use in modern air-conditioning particularly in industrial environment.…
HVAC 2 min read
Cooling and Dehumidifying
When air is cooled below the dew point temperature, Tdewpoint, condensation occurs and moisture is removed from the air stream.…
HVAC 2 min read
Governing Equation for Heating and Humidification
If the condition of the air is changing from state 1 to state 2, consider that the intersection of a…
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…
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.…