understand and describe the working of domestic appliances

1. MECHANISM OF AIR
CONDITION

2. HISTORY
• SINCE PREHISTORIC TIMES, SNOW AND ICE WERE USED
FOR COOLING.
• THE BUSINESS OF HARVESTING ICE DURING WINTER AND
STORING FOR USE IN SUMMER BECAME POPULAR
TOWARDS THE LATE 17TH CENTURY.
• THIS PRACTICE WAS REPLACED BY MECHANICAL ICE-
MAKING MACHINES.

3. HISTORY
• THE BASIC CONCEPT BEHIND AIR CONDITIONING IS SAID
TO HAVE BEEN APPLIED IN ANCIENT EGYPT, WHERE REEDS
WERE HUNG IN WINDOWS AND WERE MOISTENED WITH
TRICKLING WATER.
• THE EVAPORATION OF WATER COOLED THE AIR BLOWING
THROUGH THE WINDOW.
• THIS PROCESS ALSO MADE THE AIR MORE HUMID, WHICH
CAN BE BENEFICIAL IN A DRY DESERT CLIMATE.
• OTHER TECHNIQUES IN MEDIEVAL PERSIA INVOLVED THE
USE OF CISTERNS AND WIND TOWERS TO COOL
BUILDINGS DURING THE HOT SEASON.

4. HISTORY
• THE 2ND-CENTURY CHINESE MECHANICAL ENGINEER AND
INVENTOR DING HUAN OF THE HAN DYNASTY INVENTED
A ROTARY FAN FOR AIR CONDITIONING, WITH SEVEN
WHEELS 3 M (10 FT) IN DIAMETER AND MANUALLY
POWERED BY PRISONERS.
• IN THE 17TH CENTURY, THE DUTCH INVENTOR CORNELIS
DREBBEL DEMONSTRATED "TURNING SUMMER INTO
WINTER" AS AN EARLY FORM OF MODERN AIR
CONDITIONING.

5. WORKING OF AIR CONDITIONER

6. WHAT IS AIR CONDITIONER
• AN AIR CONDITIONER IS A SYSTEM OR A MACHINE THAT
TREATS AIR IN A DEFINED, USUALLY ENCLOSED AREA VIA
A REFRIGERATION CYCLE IN WHICH WARM AIR IS REMOVED
AND REPLACED WITH COOLER AIR. IN CONSTRUCTION, A
COMPLETE SYSTEM OF HEATING, VENTILATION, AND AIR
CONDITIONING IS REFERRED TO AS HVAC.

7. HOW DOES AN AIR CONDITIONER
WORKS
• THE AIR CONDITIONER IN A CENTRAL HEATING AND
COOLING SYSTEM PROVIDES COOL AIR THROUGH
DUCTWORK INSIDE HOME, BY PROVIDING A PROCESS
THAT DRAWS OUT THE WARM AIR INSIDE, REMOVING ITS
HEAT. ... FROM THAT POINT, THE CONDENSER OR
OUTDOOR UNIT THEN TURNS THE REFRIGERANT VAPOR
BACK INTO A LIQUID, REMOVING ANY HEAT.

8. HOW DOES AN AIR CONDITIONER
WORKS
• THE AIR CONDITIONER IN A CENTRAL HEATING AND
COOLING SYSTEM PROVIDES COOL AIR THROUGH
DUCTWORK INSIDE HOME, BY PROVIDING A PROCESS
THAT DRAWS OUT THE WARM AIR INSIDE, REMOVING ITS
HEAT. ... FROM THAT POINT, THE CONDENSER OR
OUTDOOR UNIT THEN TURNS THE REFRIGERANT VAPOR
BACK INTO A LIQUID, REMOVING ANY HEAT.

9. HOW DOES AN AIR CONDITIONER
WORKS
• AN AIR CONDITIONER CAN CHANGE THE TEMPERATURE,
HUMIDITY OR GENERAL QUALITY OF THE AIR. MORE
SPECIFICALLY, AN AIR CONDITIONER MAKES HOME
COOLER, BY DRAWING HEAT ENERGY OUT OF THE HOUSE
AND TRANSFERRING THAT HEAT TO THE OUTDOORS,
THEN REPLACING THE AIR INSIDE THE HOME WITH COOLER
AIR.

10. THANK YOU

11. HOW DOES AN AIR CONDITIONER
WORKS
• AN AIR CONDITIONER COLLECTS HOT AIR FROM A GIVEN
SPACE, PROCESSES IT WITHIN ITSELF WITH THE HELP OF A
REFRIGERANT AND A BUNCH OF COILS AND THEN
RELEASES COOL AIR INTO THE SAME SPACE WHERE THE
HOT AIR HAD ORIGINALLY BEEN COLLECTED. THIS IS
ESSENTIALLY HOW ALL AIR CONDITIONERS WORK.

12. CLASSIFICATION OF AIR
CONDITIONING SYSTEMS
• FOLLOWING ARE THE TYPES OF AIR CONDITIONING SYSTEM:
• COMFORT AIR CONDITIONING SYSTEM.
• INDUSTRIAL AIR CONDITIONING SYSTEM.
• WINTER AIR CONDITIONING SYSTEM.
• SUMMER AIR CONDITIONING SYSTEM.
• YEAR-ROUND AIR CONDITIONING SYSTEM.
• THE UNITARY AIR CONDITIONING SYSTEM
• CENTRAL AIR CONDITIONING SYSTEM.

13. EQUIPMENT USED IN AN AIR
CONDITIONING SYSTEM
FOLLOWING ARE THE MAIN EQUIPMENT OR PARTS USED IN AN
AIR CONDITIONING SYSTEM:
• CIRCULATION FAN: THE MAIN FUNCTION OF THIS FAN IS TO
MOVE AIR TO AND FROM THE ROOM.
• AIR CONDITIONING UNIT: IT IS A UNIT, WHICH CONSISTS OF
COOLING AND DEHUMIDIFYING PROCESSES FOR SUMMER
AIR CONDITIONING OR HEATING AND HUMIDIFICATION
PROCESSES FOR WINTER AIR CONDITIONING.
• SUPPLY DUCT: IT DIRECTS THE CONDITIONED AIR FROM
THE CIRCULATING FAN TO THE SPACE TO BE AIR-
CONDITIONED AT THE PROPER POINT.

14. EQUIPMENT USED IN AN AIR
CONDITIONING SYSTEM
• SUPPLY OUTLETS: THESE ARE THE GRILLS, WHICH
DISTRIBUTE THE CONDITIONED AIR EVENLY IN THE ROOM.
• RETURN OUTLETS: THESE ARE THE OPENINGS IN A ROOM
SURFACE WHICH ALLOW THE ROOM AIR TO ENTER THE
RETURN DUCT.
• FILTERS: THE MAIN FUNCTION OF THE FILTERS IS TO
REMOVE DUST, “DIRT AND OTHER HARMFUL BACTERIA”S
FORM THE AIR.

15. AIR CONDITIONER WORKING
PRINCIPLE

16. AIR CONDITIONER WORKING
PRINCIPLE
AN AIR CONDITIONER CONTINUOUSLY DRAWS THE AIR FROM
AN INDOOR SPACE TO BE COOLED, COOLS IT BY THE
REFRIGERATION PRINCIPLES AND DISCHARGES BACK INTO THE
SAME INDOOR SPACE THAT NEEDS TO BE COOLED.
THIS CONTINUOUS CYCLIC PROCESS OF DRAWL, COOLING
AND RECALCULATION OF THE COOLED AIR KEEP THE INDOOR
SPACE COOL AT THE REQUIRED LOWER TEMPERATURE NEEDED
FOR COMFORT COOLING OR INDUSTRIAL COOLING PURPOSE.
WHEN YOU SWITCH THE AIR CONDITIONER ON, THE
THERMOSTAT CONTROL SENDS 120V OF ALTERNATING
CURRENT TO THE COMPRESSOR AND THE FAN MOTOR.

17. AIR CONDITIONER WORKING
PRINCIPLE
THE COMPRESSOR ACT AS A PUMP COMPRESSING THE
REFRIGERANT IN GAS FORM INTO THE CONDENSER COILS.
LOCATED THE BACK OF THE UNIT. WHERE THE GAS IS
CONDENSED INTO A HOT LIQUID. THE CONDENSER COILS
DISSIPATE THE HEAT AS THE LIQUID TRAVELS THROUGH
THEM.
ONCE THE LIQUID REFRIGERANT HAS PASSED THROUGH THE
CONDENSER COILS AND THE CAPILLARY TUBE WHERE IT
UNDERGOES EXPANSION. THE LIQUID REFRIGERANT PASSES
THROUGH THE EVAPORATOR COILS. IT TRAVELS TO THE
EVAPORATOR COILS LOCATED NEAR THE FRONT OF THE UNIT.

18. AIR CONDITIONER WORKING
PRINCIPLE
AS THE REFRIGERANT LIQUID ENTERS THESE COILS IT
EXPANDS INTO A GAS WHICH MAKES THE COILS COLD. THE
GAS FLOWS THROUGH THE COILS TO A SUCTION LINE,
ATTACHED TO THE COMPRESSOR CONVERTS THE GAS BACK
INTO A LIQUID AND THE COOLING CYCLE CONTINUES.
AT THE SAME TIME, THE FAN MOTOR ROTATES A BLOWER
WHEEL WHICH DRAWS IN AIR TO BE COOLED BY THE
EVAPORATOR COILS BEFORE RECIRCULATING IT BACK INTO
THE ROOM. IT ALSO OPERATES THE CONDENSER FAN BLADE
WHICH BLOWS OUTSIDE AIR THROUGH THE CONDENSER COILS
TO COOL THEM.

19. AIR CONDITIONER WORKING
PRINCIPLE
THE AIR TEMPERATURE IS REGULATED BY THE THERMOSTAT
CONTROL DEPENDING ON THE MODEL. THE CONTROL MAY BE
A THERMOSTAT SWITCH AND SENSING BULB ASSEMBLY OR
ELECTRONIC CONTROL BOARD THAT WORKS WITH A SENSOR.
THE SENSING BULB OR ELECTRONIC SENSOR IS CLIPPED TO
THE FRONT OF THE EVAPORATOR COILS TO MONITOR THE
TEMPERATURE OF THE AIR ENTERING THE COILS.
ONCE THE ROOM HAS SUFFICIENTLY COOLED THE
THERMOSTAT CONTROL SHUTS OFF THE VOLTAGE TO THE
COMPRESSOR. SOME MODELS WHICH USE EVENT CAN
OPERATE THE FAN MOTOR ONLY TO DRAW IN COOL AIR AT

20. THANK YOU
PALUVADI MUKUNDA PRIYA
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