This document proposes a new method for air conditioning systems in automobiles that uses a vapor absorption refrigeration system (VARS) instead of a traditional vapor compression refrigeration system (VCRS). VARS uses low-grade heat from the car's engine rather than high-grade mechanical work, has fewer moving parts which reduces noise and wear, can operate at lower pressures, and uses ammonia as a refrigerant which is non-toxic. The proposed system would use lithium molybdate as a corrosion inhibitor and absorb ammonia-water refrigerant with desiccants. It is argued that this VARS method could provide improved engine life while overcoming issues with fuel consumption compared to traditional VCRS, meeting demands for heat

1. A method of AC
systems for
automobiles
ByBy
JOEL P JOHNJOEL P JOHN
Mechanical Dept. [3rMechanical Dept. [3rdd
yr]yr]
Pydah Kaushik CollegePydah Kaushik College

2. Introduction
• Cars got to have AC which also must be
eco-green
• Traditional AC is designed to maximize
capacity but not efficiency
• VARS above VCRS can provide engine
life overcoming fuel consumption
• The engine waste heat comes into play

3. Vapour Compression Refrigeration System

4. The refrigerant absorbs heat,
evaporates, compresses,
condenses in this
refrigeration cycle

5. • Compressors run on electrical energy
• Moving parts increases heat load
• Condenser balances heat input

6. Vapour Absorption Refrigeration System

7. • Energy can be used from exhaust,
steam or engine muda
• Moving parts are only in the pump

8. •Heated ammonia-water refrigerant is
absorbed by desiccants
•Ammonia usage is non- toxic, emits
leakage & ecogreen

9. Ammonia-Vapor Absorption Machine
• Lithium molybdate used as corrosion
inhibitor
• Water over CFC as refrigerants
• No moving parts (no dynamic load)

10. Absorption Systems: Compression Systems:
1. Low grade energy with
I.C. Engines
1. High-grade energy like
mechanical work
2. Operation is smooth 2. More wear, tear and
noise
3. Works at lower
evaporator pressures
3. COP decreases
considerably with
decrease in evaporator
pressure.
4. Moving parts present only
in the pump
4. Moving parts are present
in the Compressors
5. Hydrogen is reutilized 5.Toxic Carbons are emitted

11. Advantages involved
•Method of Compression
•Power consumption
•Type of Energy
•Refrigerant used
•Moving parts
•Greenhouse effect

12. Disadvantages
• Initial capital cost
• Low working pressures
• Corrosive nature of refrigerants
• Coefficient of performance (COP)
• Higher heat rejection

13. The VARS applies to all the
conditions like CWHR and CWHC.
It also meets the demand for
heat exchanges and durability. So
such a system using combination of
exhaust heat and ammonia vapor is
proposed and can be applied for
our car in the near-future