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Refrigeration and Air Conditioning Notes JNTU | RAC Notes JNTU

Refrigeration and Air Conditioning Notes JNTU – RAC Notes JNTU of Total Complete Notes

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Refrigeration and Air Conditioning Notes JNTU – RAC Notes JNTU

Complete Notes

Methods of Air Refrigeration system, Simple air cooling system,

Simple air evaporative cooling system, Boot strap air cooling system,

Boot strap air evaporative cooling system, Reduced ambient air cooling system,

Regenerative air cooling system, Refrigeration Systems, Reversed Carnot cycle — ideal,

 Ideal Refrigeration Cycle, Cycle efficiency, Sources of Inefficiencies, Expansion Valve Operation,

 Compressor Performance, Compressor Basics, Compressor Efficiency, Exit temperature,

Decreasing Compressor Work, Compressor Types, Compressor pressure ranges,

Terminology, Reciprocating Compressors, Reciprocating Compressors, cont,

 Reciprocating Compressor Performance, Rotary Screw Compressors, Vane Compressors,

Dynamic Compressors — Centrifugal, Scroll Compressors, Capillary Tubes

Constant-Pressure Expansion and Float Valves, Thermostatic (Superheat-Controlled) Expansion Valve

Electric Expansion Valve, Multi-Pressure Refrigeration Systems, Multistage Compression Refrigeration

Benefits of Flash Gas Removal, Flash Gas Removal Plus Intercooling,

 One Compressor & 2 Levels of Evap. Temp, 2 Compressors & 2 Evap. Temps

Refrigerator & Refrigerant, Refrigeration Cycle, Refrigeration Systems,

Vapour compression refrigeration system, Vapour absorption refrigeration system,

Thermo electric refrigeration system

AC Systems, AC options / combinations, Air Conditioning (for comfort / machine),

Split air conditioners,  Fan coil units in a larger system, Air handling units in a larger system

Refrigeration systems for industrial processes, Refrigeration at large companies

Refrigeration systems, Vapour Compression Refrigeration (VCR): uses mechanical energy,

Vapour Absorption Refrigeration (VAR): uses thermal energy Refrigeration

Refrigerant, Required cooling, Load, Ease of maintenance, Physical space requirements,

Availability of utilities (water, power), Evaporative Cooling,

Air in contact with water to cool it close to ‘wet bulb temperature’

Advantage: efficient cooling at low cost, Disadvantage: air is rich in moisture

Energy Efficiency Opportunities, Optimize process heat exchange,

Maintain heat exchanger surfaces, Multi-staging systems

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