AE 353

AUTOMOTIVE AIR-CONDITIONING

UNIT I

PSYCHROMETRY:  Psychrometric properties, Psychrometric chart, construction, Representation of Psychrometric processes on the chart, Heat and Cooling with Humidification and Dehumidification, Adiabatic dehumidification, Adiabatic chemical dehumidification and mixing processes.

UNIT II

COOLING LOAD CALCULATIONS IN AIR CONDITIONING: Concept of by pass factor, Sensible beat factor, Apparatus Dew Point, Room Sensible Heat Factor (RSHF), Gross Sensible Heat Factor (GSHF), Different heating and cooling loads, Problems.

DESIGN OF AIR CONDITIONING SYSTEMS: All fresh air, Re-circulated air with bypassed air, Design of Summer, Winter and Year round air conditioning systems

UNIT III

AIRCONDITIONING COMPONENTS

Basic air conditioning system - Location of air conditioning components in a car - Schematic layout of a refrigeration system. Compressor components - Condenser and high pressure service ports. Thermostatic expansion value - Expansion valve calibration - Controlling evaporator temperature - Evaporator pressure regulator - Evaporator temperature regulator.

UNIT IV

REFRIGERANTS

Classification of refrigerants – Coding of Refrigerants - Desirable properties of refrigerants-Substitute for CFC refrigerants - Containers - Handling refrigerants - Tapping into the refrigerant container - Ambient conditions affecting system pressures.

HEATING SYSTEM and TEMPERATURE CONTROL

Automotive heaters - Manually controlled air conditioner - Heater system - Ford automatically controlled air conditioner and heater systems - Automatic temperature control - Air conditioning protection.

UNIT V

AIR ROUTING

Objectives - Evaporator care air, flow through the Dash recirculating unit - Duct system - Controlling flow

AIR CONDITIONING SERVICE

Air conditioner maintenance and service - Servicing heater system - Trouble shooting of air controlling system - Compressor service.

Suggested Reading

1. 1.William H Crouse and Donald L Anglin, “Automotive Air conditioning ", McGraw-Hill Inc., 1990.
2. 2.Mitchell information Services, Inc, “Mitchell Automatic Heating and Air ConditioningSystems ", Prentice Hall Ind., 1989.
3. 3.Paul Weiser, “Automotive Air Conditioning ", Reston Publishing Co Inc., 1990.
4. 4.MacDonald, K.L., “Automotive Air Conditioning ", Theodore Audel series, 1978.
5. 5.Goings. L.F., Automotive Air Conditioning ", American Technical services, 1974.