What are the main characteristic of refrigerant used?

Chemical and physical characteristics

They should avoid being toxic, corrosive or flammable. In the event of leaks, it must be easy to detect. It must not affect other materials, as well as being able to mix with oil. It must be a stable compound.

What are the four properties of refrigerant?

Temperature, pressure, density (Specific volume), and enthalpy are the main properties of the refrigerant which are considered for this analysis and the graph is plotted by taking the temperature on the x-axis and other properties on the y-axis.

What is a characteristic of the refrigerant freon?

1、Freon is a transparent, odorless, non-toxic, non flammable, explosive and chemically stable refrigerant.

What are the classification of refrigerant?

There are four main groups of refrigerants and they are determined by their chemical constituents but are generally classified as Chlorofluorocarbons (CFCs), Hydro chlorofluorocarbons (HCFCs), Hydro fluorocarbons (HFCs) and Natural Refrigerants [7]. …

What are the five classifications of refrigerants?

2. Classification of refrigerants based on halogen molecules
  • CFC refrigerants. …
  • HCFC refrigerants. …
  • HFC refrigerants (hydrofluorocarbons, F-gases) …
  • PFC refrigerants (hydrofluorocarbons, F-gases) …
  • HFO refrigerants (F-gases) …
  • HC refrigerants. …
  • Inorganic refrigerants.

What is refrigerant and examples?

A refrigerant is a substance used in a heat cycle to transfer heat from one area, and remove it to another. Usually a gas at room temperature. Found in pretty much everything that cools, and sometimes in things that heat, most commonly air conditioners, fridges, freezers, and vehicle air conditioners.

What are the main three refrigerant groups?

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.

How many types of refrigerants are there?

However, there isn’t just one type of refrigerant, which makes it easy to get them confused. There are actually three different types, and using the wrong one can damage your air conditioner because they’re not interchangeable.

What is the most common refrigerant?

hydrofluorocarbons (HFCs)
The most common type of refrigerants used today across the world are hydrofluorocarbons (HFCs). Previously, chlorofluorocarbons (CFCs) were more widely used, but were phased out following the introduction of the Montreal Protocol in 1987.

What are the properties of refrigerant find the formula for R 114?

1,2-Dichlorotetrafluoroethane, or R-114, also known as cryofluorane (INN), is a chlorofluorocarbon (CFC) with the molecular formula ClF2CCF2Cl. Its primary use has been as a refrigerant. It is a non-flammable gas with a sweetish, chloroform-like odor with the critical point occurring at 145.6 °C and 3.26 MPa.

What are the properties of R22?

R22 refrigerant gas properties are refrigerant that is slightly toxic, odorless, non-flammable, no explosion hazard, has good chemical stability, does not react with water, and has no corrosive effect on metals.

What are the 7 main components of direct system of refrigeration?

The 6 Main Components of a Refrigeration System
  • Thermostatic Expansion Valve (TXV) Before the evaporator, this is located at the end of the liquid line. …
  • Evaporator. …
  • Capacity Control System. …
  • Compressor. …
  • Condenser. …
  • Receiver.

Which is the desirable physical properties of refrigerant Mcq?

The desirable properties of an ideal refrigerant are: Low boiling point. Low freezing point. High critical temperature.

What is the temperature of R22?

The lower critical temperature of R410A versus that of R22 (70.1 °C (158.1 °F) vs. 96.2 °C (205.1 °F)) indicates that degradation of performance at high ambient temperature should be greater for R410A than R22.

Why is it called R22?

R22 is the short name for the halocarbon compound CHClF2 (monochlorodifluoromethane), which is used as the refrigerant. R stands for the refrigerant. In the number “22” second “2” denotes the number of the fluorine atoms in the compound. The boiling point of R22 is -40.8 degree Celsius (-41.4 degree F).

Is R22 a CFC or HCFC?

HCFC refrigerant
R-22 is an HCFC refrigerant that is often used in air-conditioning equipment. To protect the Earth’s protective ozone layer, the United States is phasing out R-22, along with other chemicals.

What is normal pressure for R22?

155.7 psig
You simply consult the R22 RT chart below and see that at 85°F, the pressure of R22 is 155.7 psig. psig or ‘pounds per square inch gauge’ is a pressure unit we usually in refrigerant temperature pressure charts.

What is critical temperature for refrigerant?

The critical point occurs at 31°C (88°F), which is below typical system condensing temperatures for part or all of the year, depending on the climate. Above the critical point the refrigerant is a transcritical fluid.

What is superheat and subcooling?

What are superheat and subcooling? Superheat is defined as the amount of heat added to a vapor above its boiling point. Subcooling is defined as the amount of heat removed from a liquid below its condensing point.

How do you superheat?

To measure duct system superheat, start on the return side. Measure and record the air temperature entering the return grille. Then measure and record the air temperature entering the equipment. Subtract these two temperatures.

What is normal superheat for R22?

For example, 68 psi suction pressure on a R-22 system converts to 40°F. Let’s say the suction line temperature is 50°F. Subtracting the two numbers gives us 10°F of superheat. Superheat for most systems should be approximately 10F measured at the evaporator; 20°F to 25°F near the compressor.

What can cause high superheat?

Excessive or high superheat is an indication of insufficient refrigerant in the evaporator coil for the heat load present. This could mean that not enough refrigerant is entering the coil or this could also indicate an excessive amount of heat load on the evaporator coil. pressures will be lower than normal.

What is the normal subcooling?

Generally speaking, 10-12° of subcooling at the outlet of the condenser coil is most common. However, you must look for the proper design subcooling for the particular system you are working on. Some systems will require subcooling readings of up to 16° for maximum efficiency and capacity.