Lecture 3: HVAC Course (Air-Conditioning)
What is Air-Conditioning?
Air- conditioning is the process of obtaining the desired air property or condition like temperature, humidity, purity, pressure.
Used in Domestic as well as in commercial environment.
Definition: – Air –conditioning is the simultaneous control of temperature, Relative Humidity, Air movement and Air cleanliness in the conditioned space.
The primary function of air conditioning is to maintain conditions that are: 1)For Human Comfort 2) Required by a product, or process within space. ●
Reasons of using Air conditioning:-
a) To improve productivity in office, factories by maintaining comfort condition for people.
b) To maintain comfortable condition for working in hotels, labs, etc.
c) To avoid malfunctioning of some of the control panels in electrical control building.
d) To maintain pressure inside the premises for avoiding outside (dusty) air in to the room.
e) To create healthy atmosphere inside the room by supplying fresh and filtered air in the room.
f) To provide clean, filtered, healthy, comfortable conditions in hospitals etc.
PRIMARY COMPONENTS OF AIR CONDITIONING CYCEL
Without these component cycle cannot be complete
Secondary Components of Air-Conditioning:-
2)Evaporator fan or blower
How Does Air-Conditioning Works ?
As with all air conditioning systems the principle remains the same whereby the heat is removed from one area and replaced with chilled dry air and the hot air is expelled, normally to the outside atmosphere.
An air conditioner is able to cool a building because it removes heat from the indoor air and transfers it outdoors. A chemical refrigerant in the system absorbs the unwanted heat and pumps it through a system of piping to the outside coil. The fan, located in the outside unit, blows outside air over the hot coil, transferring heat from the refrigerant to the outdoor air.
Most air conditioning systems have five mechanical components:
• a compressor
• a condenser
• an evaporator coil
• a chemical refrigerant
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