Air-ConditioningAir-Conditioning

What is Air Conditioning? What is Air Conditioning?

Maintaining the air at the Maintaining the air at the desired temperature.desired temperature.

Control moisture content of the Control moisture content of the air.air.

Hold contamination to an Hold contamination to an acceptable level.acceptable level.

Circulate the air properlyCirculate the air properly

How Air-conditioning is How Air-conditioning is achieved?achieved?

Refrigeration system allow transfer Refrigeration system allow transfer of heat from the cooling space to a of heat from the cooling space to a location where heat can be easily location where heat can be easily discarded. discarded.

Transfer of heat is facilitated by Transfer of heat is facilitated by change of statechange of state as refrigerant needs as refrigerant needs latent heat to change state from latent heat to change state from liquid to gasliquid to gas at its boiling point. at its boiling point.

How Air-conditioning is How Air-conditioning is achieved?achieved?

Ex. Of Refrigerants- Ex. Of Refrigerants- Ammonia, Ammonia, Freon -12,Freon -12, Freon-22Freon-22

Working Principle Working Principle &Components of Air-&Components of Air-conditioning Systemconditioning System

Evaporator

Expansion valve

Compressor

Condenser

►Heat is absorbed by the Heat is absorbed by the refrigerant at a low temp. refrigerant at a low temp. in the in the evaporatorevaporator thereby cooling the thereby cooling the surrounding space, and is surrounding space, and is discharged at a high temp. level discharged at a high temp. level into atmosphere into atmosphere in condenserin condenser, , thereby heating the space aroundthereby heating the space around

1 TR1 TR is amount of heat required to is amount of heat required to melt melt one tonone ton of ice in of ice in 24 Hrs24 Hrs (12000 BTU/Hr)(12000 BTU/Hr)

Type of air-conditioning Type of air-conditioning SystemSystem

1)1)Window Type A/C UnitsWindow Type A/C Units

2)2)Split Type A/C UnitsSplit Type A/C Units

3)3)Package Type A/C unitsPackage Type A/C units

4)4)Central A/C plantCentral A/C plant

WINDOW /SPLIT AIR CONDITIONERS WINDOW /SPLIT AIR CONDITIONERS

Mounted on window & no floor space

No fresh air & humidity control

Weak air throw

Not suitable for continuous operation (only for comfort air-conditioning)

SPLIT TYPE AIR CONDITIONERS SPLIT TYPE AIR CONDITIONERS

Outdoor unit comprises condenser & compressor

Opening in wall/ window not required

Less noise

Distance between indoor & outdoor unit should be less than 30 ft

PACKAGE TYPE A/C UNITS PACKAGE TYPE A/C UNITS

Ease of installation and removal.

Factory assembled and tested equipment.

More control possible

Suitable for continuous operation

CENTRAL AIR CONDITIONING PLANT CENTRAL AIR CONDITIONING PLANT

For large areas to be Air-For large areas to be Air-conditioned and package A/C will conditioned and package A/C will be costly proposition.be costly proposition.

More More controls & higher controls & higher flexibilityflexibility..

Better movement of air. Better movement of air.

Factors affecting AC LoadFactors affecting AC Load

►Orientation and Location Of Building.Orientation and Location Of Building.► Construction Materials Used.Construction Materials Used.►Number and types Of Window And Doors.Number and types Of Window And Doors.► Utility Of The Space.Utility Of The Space.► Physical Dimensions Of Space.Physical Dimensions Of Space.► Lighting.Lighting.►Occupancy.Occupancy.► Appliances And Equipments.Appliances And Equipments.

Preventive Preventive Maintenance of Maintenance of

Window /Split ACWindow /Split AC

Window /Split AC-Daily Window /Split AC-Daily ChecksChecks

   Check for room temperature.Check for room temperature. Check for any abnormal Check for any abnormal

sound/vibration.sound/vibration.

Clean cooling & condenser coil periodically and comb mashed fins

Window /Split AC-Monthly Window /Split AC-Monthly ChecksChecks

CheckCheck filters and clean or filters and clean or change if requiredchange if required

Ensure proper charging of refrigerant

Check for tripping of compressor by thermostat

Window /Split AC-Yearly Window /Split AC-Yearly ChecksChecks

Complete Servicing and testing of Complete Servicing and testing of Window / split AC unit.Window / split AC unit.

Preventive Preventive Maintenance of AC Maintenance of AC

SystemSystem

Preventive Maintenance of AC Preventive Maintenance of AC System System ( Package & Central)-( Package & Central)-Daily Daily

ChecksChecks Check for Check for any vibrationany vibration in AC unit in AC unit

equipmentsequipments Check for Check for discharge & suction discharge & suction

pressurepressure Check V-Belt tension of Blower Motor/ Check V-Belt tension of Blower Motor/

condenser motor.condenser motor. Check for Check for any frostingany frosting at coil at coil Check working of fresh air fan.Check working of fresh air fan.

Preventive Maintenance of AC Preventive Maintenance of AC System-Monthly ChecksSystem-Monthly Checks

Micro Micro ––filter Cleaning.filter Cleaning.  

Fresh Air Filter cleaning.Fresh Air Filter cleaning.  

Check for Check for leakage of conditioned airleakage of conditioned air  

Check lubrication of all bearingsCheck lubrication of all bearings

Preventive Maintenance of AC Preventive Maintenance of AC System-Yearly ChecksSystem-Yearly Checks

Complete ServicingComplete Servicing of A/C plant of A/C plant

before onset of summer before onset of summer

Replace the fine filters-every Replace the fine filters-every

two yearstwo years

THANK YOU