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CHAPTER 2: AIR CONDITIONING SYSTEMS (Component Of a Refrigeration System,…
CHAPTER 2:
AIR CONDITIONING SYSTEMS
Type Of Air Conditioner
2)
Central Air Conditioning System
Has the capacity to produce hundreds of tons of air conditioning
Used for cooling big buildings, houses, offices, entire hotels, gyms, movie theaters, factories
Cooling usually only feasible with central conditioning units
1)
Packaged Air Conditioner
The compressor and condenser are housed in one casing
All the components, expansion valve and evaporator are housed in a single box
To cool more than two rooms or a larger space at your home or office
To possible arrangement
3)
Window Air Conditioner
Most commonly used for single rooms
Fitted in a slot made in the wall of room, or often a window sill
All the components is in a single box
4)
Split Air Conditioner
The outdoor unit, fitted outside the room
Have two parts, indoor and outdoor unit
The indoor unit components the evaporator or cooling coil and cooling fan
Common Problems And Each Causes In Air Conditioning
2)
Electrical Control
The air conditioner turn on and off frequently, corrosion of wire and terminal
3)
Sensor Problems
The sensor knocked out of position
1)
Drainage Problems
Condensate drain lines collect condensed water and drain it away from the unit
4)
Refrigerant Leak
Doesn't cool in an efficient manner, wear and tear
Component Of a Refrigeration System
1)
The Evaporator
FUNCTION:
The purpose of the evaporator is to remove unwanted heat from the product, via the liquid refrigerant
3)
The Compressor
FUNCTION:
The compressor transforms the vapour from a low-temperature vapour to a high-temperature vapour, in turn increasing the pressure
2)
The Condenser
FUNCTION:
To extract heat from the refrigerant to the outside
4)
Expansion Valve
FUNCTION:
Reduces the pressure of the refrigerant as it passes through the orifice, which is located inside the valve
5)
The Refrigerant
FUNCTION:
Work is done to move heat from one location to another
Flow Of Process
Liquid refrigerant entering the indoor coil, operating as the evaporator during cooling. Refrigerant in the evaporator "evaporates"
Upon entering the evaporator, the liquid refrigerant's temperature is between 5 - 10 Celcius and without changing its temperature, it absorbs heat as it changes state from a liquid to a vapor. The heat comes from the warm, moist room air blown across the evaporator coil
As it passes over the coil, it gives up some of its heat and moisture may condense from it. The cooler, drier room air is re-circulated by a blower into the space to be cooled
The vapor refrigerant now moves into the compressor, which is basically a pump that raises the pressure so it will move through the system. The increased pressured from the compressor causes the temperature of the refrigerant to rise
It now flows into the refrigerant-to-water heat exchanger, operating as the condenser during cooling. As it condenses, it gives up heat to the loop, which circulated by a pump
It then reaches the expansion valve. The expansion valve allows the high pressure refrigerant to flash through becoming a lower pressure, cooled liquid
The cycle is complete as the cool, liquid refrigerant re-enters the evaporator to pick up room heat
Application Of Air Conditioning System
Used For Various Type Of Transportation
Hospital Operating Theatres
Plants And Farm Growing Areas
Comfort Applications For Various Building Type
Nuclear Facilities
Purpose Of Air Conditioning System
The process of removing heat and moisture from the interior of an occupied space to improve the comfort of occupants
Type Of Maintenance
Mechanical Maintenance
Water Chemistry
Operational Procedure
Definition Of Air Conditioning
Air conditioner is an appliances, system or machine designed to stabilize the air temperature and humidity within an area
