This branch of science deals with the study of properties of moist air and its behaviour under different conditions
PSYCHROMETRY
Properties of moist air
Dry-bulb Temperature (DBT),
Wet-bulb Temperature (WBT),
humidity, Relative Humidity (RH),
etc.
It is the temperature of air measured or recorded by a thermometer. It is
denoted by T or Tdb or __________
Dry-Bulb Temperature (DBT)
It is the temperature of air recorded by a thermometer when its bulb is covered
with wet wick or cloth over which air is moving at a velocity at 2.5 to 10 m/s.
Wet-Bulb Temperature (WBT)
It is the temperature of air recorded by a thermometer when the moisture present in it starts condensing. It is denoted by Tdp or ______
Dew Point Temperature (DPT)
In the case of __________ of air, it is required to maintain the
temperature of cooling coil well below DPT. During the cooling process, the partial pressure of water vapor and the specific humidity w remain constant until the vapor starts condensing.
Dehumidification
The DPT (saturated temperature) can be found from the _________
corresponding to the partial pressure of water vapor Pv.
steam table
Psychometry and Air Conditioning
FUNDAMENTAL PARAMETERS
❖ Pressure
❖ Specific Humidity or Humidity Ratio
❖ Relative Humidity
❖ Enthalpy
❖ Specific Volume
❖ Degree of Saturation
