Course Content
Lesson 2: Brief History of Refrigeration.
Lesson 4: Introduction and Overview of Air-Conditioner & Refrigeration
Lesson 8: Some Short Definitions Relative to HVAC
:- DBT :- WBT :- DPT :- RH :- Specific Humidity or Moisture Content :- Enthalpy :- Enthalpy Deviation :- Specific Volume :- Sensible Heat Factor :- Alignment Circle :- Pounds of Dry Air
Lesson 9: Applied Psychrometry
Let us, now see how the various air conditioning procedures will be represented on a Psychometric chart.
Lesson 10: Heat Load Estimation
Lesson 11: Heat Load Calculation
Lesson 12: Heat Load Calculation on Excel Sheet
Lesson 13: Machine Selection
Lesson 15: Air Distribution Terminal
Lesson 16: How to Calculate Static Pressure
Lesson 17: Kitchen Ventilation
Lesson 18: Selection of AHU
Complete Heating Ventilation & Air Conditioning Online Certificate Course In Hindi
About Lesson

:- Dry-Bulb Temperature:-

The temperature of air which is measured by ordinary thermometer.

:- Web-Bulb Temperature:-

Temperature registered by a thermometer whose bulb is covered by a wetted wick and exposed to a current of rapidly moving air.

:- Dewpoint Temperature:-

Temperature at which condensation of moisture begins when the air is cooled.


Dew point temperature is that temperature at which air is condesed into liquid.

:- Relative Humidity :- 

Relative humidity is defined as the amount of water vapour present in the air to the total water vapor that air can hold.


Ratio of the actual water vapor pressure of the air to the saturated water vapor pressure of the air at the same.

:- Specific Humidity or Moisture Content :-

Weight of water vapor in grains or pounds of moisture per pound of dry air.

:- Enthalpy:-

A thermal property indicating the quantity of heat in the air above an arbitrary datum. In BTU per pound of dry air. The datum for dry is 0 F and for moisture content, 32 F water.

:- Enthalpy Deviation:-

Enthalpy indicated above, for any given condition, is the enthalpy of saturation. It should be corrected by the enthalpy deviation due to the air not being in the saturated state. Enthalpy deviation in BTU per pound of dry air. Enthalpy deviation is applied where extreme accuracy is required however; on normal air conditioning estimates it is omitted.

:-  Specific Volume:-

Cubic feet of the mixture per pound of dry air. 

:- Sensible Heat Factor:-

Ratio of sensible to total heat.

:- Alignment Circle:-

Located at 80 F db and 50% rh and used in conjunction with the sensible heat factor to plot the various air conditioning process lines.

:- Pounds of Dry Air:-

The basis for all psychometric calculation remains constant during all psychometric processes. The dry-bulb, wet-bulb, and dew point temperatures and the relative humidity are so related that if two properties are known, all other properties shown may then be determine. When air is saturated, dry-bulb, web-bulb, and dew point temperatures are all equal.

Exercise Files
Some Short Definition Relative to HVAC.pdf
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