A method of AC systems for

automobilesByBy

JOEL P JOHNJOEL P JOHNMechanical Dept. [Mechanical Dept. [3r3rdd yr] yr]Pydah Kaushik CollegePydah Kaushik College

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

Vapour Compression Refrigeration System

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

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

Vapour Absorption Refrigeration System

• Energy can be used from exhaust, steam or engine muda

• Moving parts are only in the pump

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

Ammonia-Vapor Absorption Machine

• Lithium molybdate used as corrosion inhibitor • Water over CFC as refrigerants• No moving parts (no dynamic load)

Absorption Systems: Compression Systems:1. Low grade energy

with I.C. Engines1. 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 withdecrease 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

Advantages involved

•Method of Compression•Power consumption•Type of Energy•Refrigerant used•Moving parts•Greenhouse effect

Disadvantages

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

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 isproposed and can be applied for our car in the near-future