- LOW BOILING POINT.
- SHOULD BE NON FLAMMABLE, NON EXPLOSIVE AND NON TOXIC AND SHOULD NOT CONTAMINATE FOOD OR DAMAGE ENVIRONMENT IN CASE OF LEAK.
- IT SHOULD BE NON CORROSIVE AND SHOULD NOT REACT UNFAVOURABLY WITH LUBRICANT, MOISTURE AND MATERIAL IN PLANT CONSTRUCTION.
- IT SHOULD HAVE MODERATE CONDENSING PRESSURE SO THAT MECHANICAL STRENGTH REQUIRED IN COMPRESSOR, CONDENSER AND PIPING IS LOW.
- EVAPORATING PRESSURE SHOULD BE HIGH BECAUSE PRESSURE BELOW ATMOSPHERE RESULT IN AIR AND MOISTURE INGRESS IN SYSTEM.
- HIGH EVAPORATING TEMPERATURE INCREASES GAS DENSITY WHICH LEAD TO INCREASE IN VOLUMETRIC EFFICIENCY.
- IT SHOULD HAVE HIGH COP.
- IT SHOULD HAVE HIGH LATENT HEAT OF EVAPORATION SO THAT LESS REFRIGERANT IS REQUIRED.
- LIQUID REFRIGERANT SHOULD HAVE LOW SPECIFIC HEAT AS IT IS DESIRABLE DURING THROTTLING AT EXPANSION VALVE. IT ENABLES THE REMAINING LIQUID TO BE COOLED AT THE EXPENSE OF PARTIAL EVAPORATION I.E FLASH OFF IN THROTTLING PROCESS.
- IT SHOULD HAVE HIGH CRITICAL TEMPERATURE, SO THAT CONDENSING BECOMES POSSIBLE EVEN AT HIGH TEMPERATURE AT COMPRESSOR OUTLET.
- IT SHOULD HAVE LOW/MODERATE TEMPERATURE AFTER COMPRESSION SUCH THAT OIL DECOMPOSITION AND OVERHEATING OF COMPRESSOR IS LESSER.
- EASY LEAK DETECTION.
- LOW COST AND READILY AVAILABLE.
- IT SHOULD NOT CAUSE PROBLEM OF OIL RETURNING BACK TO COMPRESSOR.
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