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The Thermodynamic Properties Of Refrigerants

Refrigerants used in the vapor compression cycle of refrigerators and air conditioners have been found to have a very damaging effect on the atmosphere. A number of safer refrigerants have been developed that are fast replacing earlier versions, although they are still being used extensively in developing countries despite restrictions.

As the refrigerant flows through the continuous vapor compression cycle it absorbs heat from a low-temperature reservoir and deflects it into the atmosphere. Different refrigerants are used for different temperature conditions and there is no ideal one that is suitable for all conditions.

Thermodynamic Properties of Refrigerants

– Low boiling and low freezing points
– High latent heat
– High saturation temperature

Below are the most important properties that good refrigerants should have in order to be considered for safe use in air-conditioning and refrigeration.

Environmental Safety

A good refrigerant does not harm the environment, contribute to the ozone layer depletion or increase the earth’s greenhouse effect. For many years CFCs (chlorofluorocarbons) were used that, when leaked into the atmosphere, caused excessive damage to the ozone layer. The most damaging effect of CFCs is their long atmospheric life which in some cases can be up to one hundred years, meaning that once it has leaked out it could continue damaging the atmosphere for a hundred years.

Non-Toxic to Humans

Because refrigerants are used extensively in air conditioning systems as well as commercial and household refrigeration, they come in close contact with human beings, particularly refrigerant technicians who install and repair them on a daily basis. For this reason, it is of vital importance that refrigerants for use in these systems are non-toxic to human life. Ammonia is the only toxic refrigerant used to a large extent, however, its applications are limited to ice plants, big cold storage facilities, and packing plants.

Chemical Properties

Most refrigerants in use today are non-flammable and non-explosive to ensure the safety of human beings who come into contact with it. It should also be non-corrosive and non-irritating. The flammability and explosiveness of ammonia are very low and usually nullified by the use of precautionary measures.


The refrigerant used in air conditioning and refrigeration systems should produce maximum refrigeration and have a high coefficient performance, consuming less power to produce the desired effect. The actual cost of the refrigerant is important for economic considerations.

Other Properties

Refrigerants should have high thermal conductivity, low viscosity and low-pressure ratios and pressure differences. It should also have low power consumption and high electrical insulation.

Ammonia Properties

Ammonia is highly toxic but it has excellent thermal properties and low volumetric displacement. It has the highest refrigeration effect per kilogram of all refrigerants and comes at a low cost.

Methyl Chloride Properties

This liquid, sweet, colorless refrigerant has a non-irritating odor, is non-flammable and non-toxic. In the past, it has been used for both commercial and domestic applications but can never be used with aluminum. Know Why You Need An Electronic Components Manufacturers List?

R11 Trichloro monofluoro methane Properties

It is non-corrosive, non-toxic and non-flammable. It has a boiling point of 24 degrees Celsius and mixes completely with mineral lubricating oils under all conditions and is used in small factories and offices. Know Where To Locate Components Electrical Circuit Information Online .

R12 Dichloro-difluoro methane or Freon 12 Properties

Its non-flammable, non-explosive, non-toxic properties make it the most suitable refrigerant for domestic applications.

R22 Monochloro-difluoro methane or Freon 22 Properties

Superior to Freon R12 in many respects, the compressor displacement per tonne of refrigeration is 60% less than the compressor displacement of Freon R12. visit us at http://www.bluonenergy.com/r22-alternative/ .

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