Influence Of Thermodynamics On Refrigerators

Influence of thermodynamics on refrigerators

Introduction.

It is important to keep in mind that, to use a liquid as a refrigerant, there are certain properties, both thermodynamics and physical and with these it is possible to comply with aspects that are relevant. A good refrigerant is characterized by having the ability to download the heat it absorbs from the evaporator, the compressor and the suction line in the condenser. 

Developing.

Due to the drag that occurs on a heat part, refrigerants return to the evaporator and that is why their ability to permeate heat is reduced. It is essential, keep in mind that a refrigerant performs several functions, such as absorbing, transporting, and rejecting heat;This happens when changing steam liquid and returning to liquid. To understand all this, the relationship between pressure and temperature is basic. 

Thermodynamic properties

1. Pressure: In this case, the main thing is that the pressure acting in the refrigerator must be positive.

two. Temperature: In this part several appreciations are required, that there is a low boiling temperature, its critical temperature must be above the condensation temperature and finally the freezing temperature must be below the evaporator temperature.

3. Volume: the main thing is that there is a low specific volume value in the steam phase and a high volume value in the liquid phase.

4. Entalpia: In this case you have to have a high latent heat value of vaporization.

5. Density: varies with temperature, that is, the density of saturated steam increases when the temperature rises, while the liquid density decreases as the temperature increases.

6. Entropy: The main thing on this property is that the values in the change of entropy are from a saturation temperature to another.

• Physical and chemical properties

1. Non -toxic, nor poisonous: this is handled and has to go through many people and the magnitude of the damage depends on the refrigerant concentration, its nature and the time that is exposed to that.

two. Not explosive, or flammable: in this case it will vary in terms of its power to burn or support combustion. It depends on three groups, in which its degree of flammability or explosiveness is taken into account

3. Not having a consequence of other materials: it is essential that those who are compatible be taken, since this can prevent several situations. In this part it is necessary to be compatible with metals, elastomers and plastics.

4. Easy to detect when it escapes: it is known that most refrigerants tend to escape and there are some factors that determine this, such as pressure, viscosity, density and other agents.

5. Being miscible with oil: it is quite important in the design of the refrigerant you want, since its function is to lubricate the moving parts of the compressor and it is difficult to prevent some oil from reaching the coolant.

6. Do not react with moisture: most refrigerants absorb moisture. Therefore, it is good that it remains below the maximum permissible limit and in such a way to operate effectively.

7. Be a stable compound: it is required that they have adequate stability, to use the refrigerant in the most common applications. 

conclusion.

It is essential that refrigerants meet the following properties, which also have concepts that will make the subject clearer. However, refrigerants who know each.