• It must be environmentally friendly.
  • The latent heat of vaporization must be high.
  • Its critical temperature and pressure must be high.
  • The boiling point at atmospheric pressure should be low.
  • The saturation pressure must be below the pressure of the regulator valve.
  • It must prevent air leakage, that is, the water vapor brought by the air solidifying in cold parts and causing operational disruptions, and for this, the evaporation pressure must be slightly above the ambient pressure.
  • It should not damage the oil tanker and the tools used in the production of other components that make up the installation.
  • There should be no corrosion effect.
  • It should not cause any chemical change anywhere in the system.
  • It should not be flammable, explosive or poisonous.
  • It should be easily available and inexpensive.
  • It should be suitable for the use of a small capacity compressor.
  • Closed circuit leaks should be easily detected.
  • In order to avoid having too large compressor sizes for high cooling capacities, the latent heat of vaporization must be high.