Air condition, Refrigeration Cycle, AC Cycle, Principles of AC, Applications

AC, Refrigerator, AC Cycle, Applications, Principles, humidity, comfort zone, Installation types, window ac, Split ac

1. Air Conditioning - MEFC Presentation Rakesh Kumar (R080114027) Air Conditioning

2. Air Conditioning Air Conditioning Air Conditioning Talk Outline What is Air Conditioning? Human Comfort Comfort Zone Installation Types Main Parts Condenser Compressor Evaporator Expansion Valve Blower Chemical Refrigerant Montreal Protocol 6. How Does it work? 7. Refrigeration Cycle 8. Complete Cycle Window Type Split Type 9. Uses

3. Air Conditioning Air Conditioning What is Air Conditioning? Air conditioning is the process whereby the condition of air, as defined by its temperature and moisture content, is changed. Note that in this practice some more things are taken into account, such as Cleanliness , Odor , Velocity of air & Distribution pattern .

4. Air Conditioning Air Conditioning Human comfort As we all know, comfort is a very subjective matter. From Statistical surveys engineers aims to ensure ‘ COMFORT ’ to most of the people. Most people (90%) are comfortable when the air temperature is between 18-22°C and the % RH is between 40-65%. This zone can be shown on the psychrometric chart., and is known as the comfort zone .

5. Air Conditioning Air Conditioning Comfort Zone ( Psychrometric Chart) 65% 40% 22 18 Temperature ( ˚C ) Air outside is at different conditions from our comfort zone condition. In order to bring its condition to within the comfort zone we may need to do one or more of the following :- heat it; cool it; dehumidify it; humidify it ; % Relative Humidity Humidity

6. Air Conditioning Air Conditioning Air Conditioning Installation Types of AC 1. Window AC 2 . Split AC

7. Air Conditioning Air Conditioning Main Parts A condenser A compressor An evaporator coil An expansion valve Blower A chemical Refrigerant

8. Air Conditioning Air Conditioning Condenser Condenser is used to condense the refrigerant from vapor to liquid.

9. Air Conditioning Air Conditioning Compressor The function of the compressor is to continuously draw the refrigerant vapor from the evaporator and compress it to a high pressure.

10. Air Conditioning Air Conditioning Evaporator In evaporator the lower temperature refrigerant absorbs the heat from the space to be cooled and the refrigerant gets evaporated.

11. Air Conditioning Air Conditioning Expansion Valve The function of expansion valve is to meter the proper amount of liquid refrigerant and reduce the pressure of liquid refrigerant entering the evaporator. It has a temperature sensor connected to it, which helps it in doing that.

12. Air Conditioning Air Conditioning Air Conditioning Blower This is the small motor fan that is fitted behind the evaporator or cooling coil inside the assembly of the window air conditioner system. It’s main work is to suck and give out air.

13. Air Conditioning Air Conditioning Air Conditioning Chemical Refrigerant Desirable properties: High latent heat of vaporization - max cooling Non-toxicity (no health hazard ) Chemical stability ( non flammable/non-explosive ) Ease of leak detection Low cost availability Commonly use FREON ( R-22, R-12 etc.) Refrigerants are fluid which is circulating in the Refrigeration Cycle of air conditioner.

14. Montreal protocol- Control Schedule ozone depleting substance developed countries developing countries CFCs phased out end of 1995 total phase out by 2010 halons phased out end of 1993 total phase out by 2010 HCFCs total phase out by 2020 total phase out by 2040 Air Conditioning Air Conditioning Air Conditioning Refrigerants

15. Air Conditioning Air Conditioning Air Conditioning High Temperature Reservoir Low Temperature Reservoir R Work Input Heat Absorbed Heat Rejected How does it work ? Conservation of Energy

16. Air Conditioning Air Conditioning Air Conditioning Refrigeration cycle Condenser Evaporator High Pressure Side Low Pressure Side Compressor Expansion Device 1 2 3 4 16

17. Air Conditioning Air Conditioning Air Conditioning Low pressure liquid refrigerant in evaporator absorbs heat and changes to a gas Condenser Evaporator High Pressure Side Low Pressure Side Compressor Expansion Device 1 2 3 4

18. Air Conditioning Air Conditioning Air Conditioning The superheated vapour enters the compressor where its pressure is raised Condenser Evaporator High Pressure Side Low Pressure Side Compressor Expansion Device 1 2 3 4

19. Air Conditioning Air Conditioning Air Conditioning The high pressure superheated gas is cooled in several stages in the condenser Condenser Evaporator High Pressure Side Low Pressure Side Compressor Expansion Device 1 2 3 4

20. Air Conditioning Air Conditioning Air Conditioning Liquid passes through expansion device, which reduces its pressure and controls the flow into the evaporator Condenser Evaporator High Pressure Side Low Pressure Side Compressor Expansion Device 1 2 3 4

21. Air Conditioning Air Conditioning Air Conditioning Complete Cycle (Window)

22. Air Conditioning Air Conditioning Air Conditioning Complete Cycle (Split) Inside Room Outside Room

23. Air Conditioning Air Conditioning Air Conditioning Uses :- It is used in- Industries Cold storage In houses Cooling of electronic spaces and equipment

24. Air Conditioning Air Conditioning Air Conditioning Thank You for your patience…!!!

25. Air Conditioning Air Conditioning Air Conditioning Questions?

26. Air Conditioning Air Conditioning Air Conditioning