Answer: A - High latent heat of vaporization and low freezing point.
A good refrigerant should have high latent heat of vaporization and low freezing point.
A good refrigerant should have high latent heat of vaporization and a low freezing point. If we understand the necessary characteristics of the ideal refrigerant, we may understand it better.
Required Properties of Ideal Refrigerant:
- At the evaporator pressure, a refrigerant should have a high latent heat of evaporation. A strong refrigerating effect per kilogram of circulated refrigerant is produced by the high latent heat.
- Both the boiling and freezing points of the refrigerant should be low.
- It must have high latent heat and low specific heat. Because high latent heat at low temperatures enhances the refrigerating effect per kilogram of refrigerant, whereas high specific heat decreases it.
- It must have high critical pressure and temperature to prevent high power requirements.
- It should have a small specific volume to minimize the compressor's size.
- The evaporator and condenser must be kept at both positive pressures to prevent air leakage into the system and low enough to minimize material costs.
- It should not be toxic, corrosive, combustible, or explosive.
- When a leak occurs in the system, it shouldn't have any negative consequences on the food or materials that are being stored there.
- It must be highly miscible with lubricating oil and not require a suitable lubricating oil reaction in the system's temperature range.
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