A presentation on “VAPOUR COMPRESSION REFRIGERATION SYSYTEM” M.E. Thermal Engineering(021) Mahatma Gandhi Institute of Technical Education and Research centre

CONTENT:- INTRODUCTION COMPONENTS OF SIMPLE VCR SYSYTEM VAPOUR COMPRESSION CYCLE IMPROVEMENTS IN SIMPLE SATURATION CYCLE COMPOUND VCR SYSTEMS MULTIPLE EVAPORATOR AND COMPRESSOR SYSTEMS

1. INTRODUCTION:- A vapour compression refrigeration system is an improved type of air refrigeration system in which a suitable working substance, termed as refrigerant, is used. It condenses and evaporates at temperatures and pressures close to atmospheric conditions. The refrigerants, usually used for this purpose are ammonia (NH3), carbon dioxide (CO2) and Sulphur dioxide (SO2). The vapour compression Refrigeration system is nowadays used for all purpose refrigeration. It is generally used for all industrial purpose from a small domestic refrigerator to a big air conditioning plant.

2. COMPONENTS OF SIMPLE VCR:-

Advantages Disadvantages The initial cost is high. The prevention of leakage of the refrigerant is the major problem in vapour compression system. Advantages It has smaller size for the given capacity of refrigeration. It has less running cost. It can be employed over a large range of temperatures.

3. VAPOUR COMPRESSION CYCLE :- NO NAME T-S DIAGRAM h-s diagram 1. Cycle with dry saturated vapour after compression 2. Cycle with wet vapour after compression

NO NAME T-S DIAGRAM h-s diagram 3.  Cycle with superheated vapour after compression 4. Cycle with superheated vapour before compression

NO NAME T-S DIAGRAM h-s diagram 5.  Cycle with undercooling or subcooling of refrigerant

SIMPLE SATURATION CYCLE:- 4. IMPROVEMENTS IN SIMPLE SATURATION CYCLE:- NO NAME T-S DIAGRAM h-s diagram 1.  with flash chamber 2. With accumulator or Pre-cooler

NO NAME T-S DIAGRAM h-s diagram 3.  Subcooling with liquid refrigerant by vapour refrigerant 4. Subcooling with liquid refrigerant by liquid refrigerant

5. COMPOUND VCR SYSTEMS:- NO NAME T-S DIAGRAM h-s diagram 1.  With liquid intercooler 2. With Water Intercooler & Liquid Sub-cooler

NO NAME T-S DIAGRAM h-s diagram 3.  With Water Intercooler, Liquid Subcooler & Liquid Flash Chamber 4. With Water Intercooler, Liquid Subcooler & Flash Intercooler

NO NAME T-S DIAGRAM h-s diagram 5.  Three stage compression with water intercoolers 6. Three stage compression with Flash chamber

NO NAME T-S DIAGRAM h-s diagram 7.  Three stage compression with Flash Intercooler 8. Three stage compression with Multiple Expansion valves and Flash chamber

6. MULTIPLE EVAPORATOR AND COMPRESSOR SYSTEMS:- NO NAME T-S DIAGRAM h-s diagram 1.  At same temp. With single compressor and Expansion valve 2. At different temp. with single compressor individual expansion valves and Back pressure valve `

NO NAME T-S DIAGRAM h-s diagram 3. At different temp. with single compressor Multiple expansion valves and Back pressure valve 4. At different temp. with Individual compressor Individual expansion valves

NO NAME T-S DIAGRAM h-s diagram 5.  At different temp. with Individual compressor Multiple expansion valves 6. At different temp. with compound compressor Individual expansion valves

NO NAME T-S DIAGRAM h-s diagram 7.  At different temp. with compound compressor Individual expansion valves and Flash Intercooler 8. At different temp. with compound compressor Multiple expansion valves and Flash Intercooler

Thank You !