Air Conditioning

Air Conditioning- MEFC Presentation

Rakesh Kumar (R080114027)

Air Conditioning

Air Conditioning

Air Conditioning

Air ConditioningTalk OutlineWhat is Air Conditioning?Human ComfortComfort ZoneInstallation TypesMain Parts

CondenserCompressorEvaporatorExpansion ValveBlowerChemical RefrigerantMontreal Protocol

6. How Does it work?7. Refrigeration Cycle8. Complete CycleWindow TypeSplit Type9. Uses

Air Conditioning

Air ConditioningWhat is Air Conditioning?Air conditioning is the process whereby the condition ofair, 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.

Air Conditioning

Air ConditioningHuman comfortAs 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 18-22C and the % RH is between 40-65%. This zone can be shown on the psychrometric chart., and is known as the comfort zone.

Air Conditioning

Air Conditioning

Comfort Zone(Psychrometric Chart)65%40%2218

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 HumidityHumidity

Air Conditioning

Air Conditioning

Air ConditioningInstallation Types of AC1. Window AC2. Split AC

Air Conditioning

Air ConditioningMain PartsA condenserA compressorAn evaporator coilAn expansion valveBlowerA chemical Refrigerant

Air Conditioning

Air ConditioningCondenserCondenser is used to condense the refrigerant from vapor to liquid.

Air Conditioning

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

Air Conditioning

Air ConditioningEvaporatorIn evaporator the lower temperature refrigerant absorbs the heat from the space to be cooled and the refrigerant gets evaporated.

Air Conditioning

Air ConditioningExpansion ValveThe 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.

Air Conditioning

Air Conditioning

Air ConditioningBlowerThis is the small motor fan that is fitted behind the evaporator or cooling coil inside the assembly of the window air conditioner system. Its main work is to suck and give out air.

Air Conditioning

Air Conditioning

Air ConditioningChemical RefrigerantDesirable properties:High latent heat of vaporization - max coolingNon-toxicity (no health hazard)Chemical stability (non flammable/non-explosive)Ease of leak detectionLow costavailabilityCommonly use FREON (R-22, R-12 etc.)Refrigerants are fluid which is circulating in the Refrigeration Cycle of air conditioner.

Montreal protocol- Control Scheduleozone depleting substancedeveloped countriesdeveloping countriesCFCsphased out end of 1995total phase out by 2010halonsphased out end of 1993total phase out by 2010HCFCstotal phase out by 2020total phase out by 2040

Air Conditioning

Air Conditioning

Air ConditioningRefrigerants

Air Conditioning

Air Conditioning

Air Conditioning

High Temperature Reservoir

Low Temperature ReservoirR

Work InputHeat AbsorbedHeat RejectedHow does it work ?Conservation of Energy

Air Conditioning

Air Conditioning

Air ConditioningRefrigeration cycleCondenserEvaporator

High Pressure SideLow Pressure SideCompressor

Expansion Device

12

34

16

Air Conditioning

Air Conditioning

Air ConditioningLow pressure liquid refrigerant in evaporator absorbs heat and changes to a gasCondenserEvaporator

High Pressure SideLow Pressure SideCompressor

Expansion Device

12

34

Air Conditioning

Air Conditioning

Air ConditioningThe superheated vapour enters the compressor where its pressure is raisedCondenserEvaporator

High Pressure SideLow Pressure SideCompressor

Expansion Device

12

34

Air Conditioning

Air Conditioning

Air ConditioningThe high pressure superheated gas is cooled in several stages in the condenserCondenserEvaporator

High Pressure SideLow Pressure SideCompressor

Expansion Device

12

34

Air Conditioning

Air Conditioning

Air ConditioningLiquid passes through expansion device, which reduces its pressure and controls the flow into the evaporatorCondenserEvaporator

High Pressure SideLow Pressure SideCompressor

Expansion Device

12

34

Air Conditioning

Air Conditioning

Air ConditioningComplete Cycle (Window)

Air Conditioning

Air Conditioning

Air ConditioningComplete Cycle (Split)

Inside RoomOutside Room

Air Conditioning

Air Conditioning

Air ConditioningUses:-It is used in-

IndustriesCold storageIn housesCooling of electronic spaces and equipment

Air Conditioning

Air Conditioning

Air ConditioningThank You for your patience!!!

Air Conditioning

Air Conditioning

Air ConditioningQuestions?

Air Conditioning

Air Conditioning

Air Conditioning