A method of AC systems for automobiles
Transcript of A method of AC systems for automobiles
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