What are the properties of a refrigerant?
Physical Properties of Refrigerants
- Low Freezing Point. Refrigerants should have low freezing point than the normal operating conditions.
- Low Condensing Pressure.
- High Evaporator Pressure.
- High Critical Pressure.
- High Vapor Density.
- High Dielectric strength.
- High Latent Heat of Vaporization.
- High Heat Transfer Coefficient.
What are the three types of refrigerants?
Types of Refrigerants
- Chlorofluorocarbons (CFCs), including R12. This is known to contribute to the greenhouse gas effect.
- Hydrochlorofluorocarbons (HCFCs), including R22.
- Hydrofluorocarbons (HFCs), including R410A and R134.
What are the four properties of refrigerant?
Properties of a good refrigerants:
- Low boiling Point.
- High Critical Temperature.
- High latent heat of vaporisation.
- Low specific heat of liquid.
- Low specific volume of vapour.
- Non-corrosive to metal.
- Non-flammable.
- Non-explosive.
Which is desirable physical property of refrigerant?
The desirable properties of a refrigerant are as follows: High critical temperature to have large isothermal energy transfer. The specific heat of liquid should be as small as possible and of vapour should be as high as possible to give less superheating of vapour.
What is refrigerant composition?
HCFC Refrigerant: HCFC refers to the chemical composition of the refrigerant. Hydrochlorofluorocarbon indicates that the refrigerant is comprised of Hydrogen, Chlorine, Fluorine, and Carbon. Common HCFC refrigerants are R-22, R-123, R-124, and R-142b.
What is the most important properties of refrigerants?
The refrigerant is a heat carrying medium which during their cycles (i.e. compression, condensation, expansion, evaporation) in the refrigeration system absorb heat from a low temperature system and discard the heat so absorbed to a higher temperature system. Properties of a good refrigerants: Low boiling Point.
Which refrigerant has the highest pressure?
∴ Ammonia has the highest critical point pressure.
Which refrigerant has highest refrigeration efficiency?
Solution(By Examveda Team) Sulphur dioxide has the highest freezing point.
What is refrigerant blend?
Refrigerant blends contain a mixture of two or more refrigerants. Generally, a refrigerant blend will contain two refrigerants. If it contains three refrigerants, the term for that is a ternary blend. For example, R-407c is a ternary blend of three HFC refrigerants.
Which refrigerant has highest critical temperature?
R-11 has the highest critical point temperature.
What is a refrigerant made of?
In addition to fluorine and carbon, Freons often contain hydrogen, chlorine, or bromine. Thus, Freons are types of chlorofluorocarbons (CFCs), hydrochlorofluorocarbons (HCFCs), and related compounds. The name Freon is a trademark registered by E.I. du Pont de Nemours & Company.
What is azeotrope refrigerant?
azeotropic refrigerant. a blend that contains two or more refrigerants whose equilibrium vapor phase and liquid phase compositions are the same at a given pressure. The temperature of an azeotropic refrigerant remains constant as it evaporates or condenses at constant pressure (compare to zeotropic refrigerant).
What are the physical properties of refrigerants?
Physical properties of refrigerants – molecular weight, boiling, freezing and critical points Physical properties of some common refrigerants: 1) Production of R11 or CFC-11 was halted by the clean air act on January 1, 1996 2) Production of R12 or CFC-12 (Dichlorodifluoromethane) was halted by the clean air act on January 1, 1996
What makes an ideal refrigerant?
In addition to having the desired thermodynamic properties, an ideal refrigerant would be nontoxic, nonflammable, completely stable inside a system, environmentally benign even with respect to decomposition products, and abundantly available or easy to manufacture.
Which refrigerant is used for all types of applications?
There is no one refrigerant that can be used for all types of applications i.e there is no ideal refrigerant. It one refrigerant has certain good advantages, it will have some disadvantages also. Hence, a refrigerant is chosen which has greater advantages and fewer disadvantages.
Why are customers concerned about the safety of refrigerants?
Concerns with refrigerant safety have been heightened by negative marketing by competing equipment and refrigerant vendors. Frequent overstatement (to influence customer perceptions) coupled with contradictions have fueled discomfort in refrigerant choices for some alternative refrigerants.