Influence Of Thermodynamics On Refrigerants

Influence of thermodynamics on refrigerants

Introduction

In order for a liquid to be possible as a refrigerant, it must have certain properties, both thermodynamics and physical and thus achieve different important aspects. A good refrigerant is able to download all the heat that absorbs from the evaporator, the suction line and the compressor in the condenser. Unfortunately, the vast majority of refrigerants return to the evaporator by dragging a certain heat part and also reduces the refrigerant capacity to absorb heat. 

Developing

To understand the refrigerants, the relationship between pressure and temperature is basic. Therefore, it is important. A good refrigerant is important to meet the following properties and also understand these concepts to have more clarity on the subject.

Thermodynamic properties

1. Pressure: the pressure that acts in a cooling system is very important, since it must operate with positive pressures.
2. Temperature: It is important that you have a low boiling temperature. Apart from its critical temperature, it must be above the condensation temperature. And the freezing temperature must be below the evaporator temperature.
3. Volume: It is required that it has a low specific volume value in the steam phase and a high volume value in the liquid phase.
4. Entalpia: It must have a high latent heat value of vaporization.
5. Density: varies with temperature. Saturated steam density increases when the temperature rises, while liquid density decreases as temperature increases
6. Entropy: values in the change of entropy from a saturation temperature to another is important.

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Physical and chemical properties

1. Non -toxic, or poisonous: it is important, since it is handled by many people, from the manufacturer, distributor to whom he receives it and the magnitude of the damage depends on the refrigerant concentration, its nature and the time that is exposed to that.
2. Non -explosive, or flammable: it varies extremely in mind to its faculty to burn or support combustion. In this case it depends on three groups according to their degree of flammability or explosiveness
3. Not having effect on other materials: it is required to be compatible with metals, elastomers and plastics.
4. Easy to detect when it escapes: most refrigerants have a tendency to escape and there are several factors that determine this, such as pressure, viscosity, density and other agents.
5. Be miscible with oil: it is quite important in the design of cooling systems. The function of this is to lubricate the mobile parts of the compressor and it is difficult to prevent some oil from going to the system that accompanies the refrigerant.
6. Do not react with moisture: most refrigerants absorb moisture in variable quantities, in the cooling system, such quantity is important that it remains below the maximum permissible limit and thus operate effectively operate
7. Be a stable compound: a large part of refrigerants have adequate stability for applications in which they are used.

conclusion

It is important to clarify that known refrigerants none brings together all the aforementioned qualities, that is, there is no ideal refrigerant, so you must take into account a balance of advantages and I know how to select the one that meets the greatest number of such characteristics based onThe design required.