Refrigerants are fluids used in a refrigeration cycle to extract heat from the substances being refrigerated. It is a substance or mixture made up of two or more chemical compounds. Refrigerants do not make things cold but act to remove the heat from them.
Hydrogenated fluorocarbon refrigerants are made from hydrogen
Fluorine, and carbon and the fact that they do not contain chlorine makes them the least damaging to the ozone. HCFC refrigerants contain chlorine but are not as damaging to the environment and the ozone layer as are CFCs or chlorofluorocarbon refrigerants. These CFCs have been largely phased out. What are the other properties of refrigerants that are important for their ideal functioning?
There are many properties that are desirable in refrigerants that can help them to perform with the required degree of efficiency. Vapor density is the first, and when the refrigerant has a lower density, it can be used by smaller compressors and refrigeration equipment. A refrigerant needs to have a high enthalpy of vaporization. This ensures that the maximum heat is absorbed during the refrigeration cycle. Enthalpy is the latent heat of vaporization and is the amount of heat that must be added to the liquid to convert it into gas.It is the normal boiling temperature of the liquid refrigerant and is often a function of the pressure at which this transformation from liquid to gas takes place. A refrigerant must also have the property of high thermal conductivity so that there is a faster transfer of the heat both during evaporation and condensation. Read about The Many Parts Of Refrigeration System And Their Functions
In most refrigeration equipment
Compressors are hermetically sealed and will have motor windings that are cooled by the refrigerants as they make their way to the suction valve of a compressor. They will pass through an electric field which can affect their insulation properties. When a refrigerant has a high dielectric strength it will withstand greater electric fields without breaking down. The critical temperature that a refrigerant has is another property that can affect its capacity for large ranges of isothermal energy transfer. This temperature must be above the condensing temperature. A good refrigerant must also have the property of minimum specific heat. This ensures the minimum change in the entropy during the process of throttling that the refrigerant has to undergo during a refrigeration cycle.
The constant pressures in refrigeration systems can cause refrigerants to leak. These pressures can wear out the joints in the piping through which the refrigerant is passing, or the material that it is made of. If the refrigerant has a denser property it is less likely to leak. Leakage can easily be identified if the refrigerant has a distinct odor or color. It is also desirable for refrigerants to be non-toxic, especially when they are used for food preservation or air conditioning so that they do not affect the health of humans exposed to them.
Finally, we must look at costs and availability when you are looking for the right properties of refrigerants. They should be economical to replace and replenish and must be easily available at the places where they need to be used. Visit us at http://www.bluonenergy.com/r22-replacement/ .