A Good Refrigerant Should Have

By Mohit Uniyal|Updated : July 22nd, 2022

A good refrigerant should have_______.

  1. High latent heat of vaporization and low freezing point
  2. High operating pressure and low freezing point
  3. High specific volume and high latent heat of vaporization
  4. Low coefficient of performance and low freezing point

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.

Solution:

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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