How does a refrigerator works?

                      image by-pixabay.

The refrigerator is a great invention for households as well as for commercial that has changed our way of life. It makes it possible to preserve our foods and keep them fresh for days long. The cool atmosphere inside of the refrigerator lowers the growth of bacteria in our foods and preserves the foods for longer. The refrigerator is an essential device today to develop human society. If you like to know how does a refrigerator is working exactly then it will be better to understand first the working principle behind it. How does the refrigerator remain cool it's inside? The working principle of a refrigerator is a quite simple process,  like an evaporative air cooler, which is a method applied. Refrigerators are allowed people to store food in bulk and consume fresh foods later when he or she requires. At its primitive stage, it was a luxurious good to use in society. But now these days is a common and very essential equipment for every householder. A refrigerator is divided into two storage compartments - one is used for frozen mostly liquid items and the other is used for refrigeration. The refrigerator may consider as one of the miracles of the modern living of life.

The basic mechanism of a refrigerator:-
Very simple basics are work behind a refrigerator. The compressor has compresses the refrigerant gas. The compressed gas grew heats as it's pressurized.

Coils on the back of the refrigerator allow the hot gas to dissipate its heat and then condenses it into the liquid at high pressure.

This high-pressure liquid flows with the help of an expansion valve as its narrow passes(a small hole).On one side of the expansion valve contains high-pressure refrigerant liquid and the other side of the expansion valve is a low-pressure area. The high-pressure liquid immediately boils and starts vaporizing, then the temperature starts dropping its heat up to -25°F. This process makes the cool inside of the refrigerator. The refrigerant gas is absorbed by the compressor again, and the process is repeated continuously.

 It follows the evaporation of a liquid to absorb heat. When the water evaporates, it absorbs heat, and make that a cool feeling. The liquid used in a refrigerator evaporates at an extremely low temperature, so it can create freezing temperatures inside the refrigerator.

See Also:- How to select a best micro-oven under your budget?

Basic parts of the refrigerator:-

 Compressor

 Heat-exchanger.

 Expansion valve.

 Heat-exchanging pipes.

 Refrigerant or liquid.

The working principle of Refrigerator:-

The second law of thermodynamics is working behind the refrigerator that the heat can make to flow from cold to a hot substance with the help of external sources.
Various parts of Refrigerat:-

Evaporator-Evaporator is used to receive the liquid refrigerants from the condenser through a throttle valve to evaporate it. The evaporator is an important part of the

refrigeration systems. In refrigeration, the entire

cooling system comes in effect with the help of an evaporator.

The evaporator is work as a heat exchanger that

transfers the heat from the substance to be cooled to the

refrigerant, thus the evaporator removes heat from the substance makes the cool inside of the refrigerator.

Compressor:- Compressor is used to draw the refrigerant from the evaporator with the help of a suction valve at low pressure and force it to the condenser through the exhaust valve at high pressure and temperature.

Condenser:-Condenser is used to condense the refrigerants to saturate temperature from vapor to liquid by transforming its latent heat to the water.

Throttle valve:-The refrigerant leaves the compressor at high and temperature and enters the condenser. Here is the throttling valve where the temperature of the refrigerant is reduced and it's then ready to produce the cooling effect within the evaporator of the refrigerator or the cooling coil of the air conditioning.
Properties of refrigerators:-

b) lower of freezing point.

c) lower of boiling point.

d) lower heat capacity.

e) lower of specific volume.

f) lower of saturation pressure

g) odorless.

h) High latent heat of vaporization.

i)quality thermal conductivity.

j) high COP

k) Non-inflammable and non-explosive substance.

l) high pressure and temperature.

Uses of refrigeration:-

a) Making for ice

b) Preservation of food and medicines.

c) Air conditioning.

d) Computer data center functioning.

e) Products of rocket fuels.

f) Transportation of food supplies and dairy products.

g) Special industrial purposes.

Different types of Refrigerators:-
Top-Freezer Refrigerator.
Side-by-Side Refrigerator.
Bottom Freezer Refrigerator.
French Door Refrigerator.
Counter-Depth Refrigerator.
Mini Fridge.
Selection Criteria for Refrigerant:-

The selection of refrigeration is

based on the following requirements.

Thermodynamic and thermophysical

properties:- a)Suction pressure:- Given that evaporated saturation temperature pressure should be higher of atmospheric to the prevention of air or moisture entered into the system and of leak detection. Higher suction is better as it can lead to smaller compressors and displacement.

b)Discharge pressure:- Given condenser temperature,  pressure should be as small as possible to discharge allow to the lightweight construction of the compressor, condenser, etc.

c)Pressure ration:- Pressure should be as small as possible, for the high volumetric efficiency as low power consumption.

d)Latent and heat of vaporization:-Latent heat Should be as large as possible that the required mass flow rate per unit cooling capacity will be small.

Environment and safety properties:-The environment and safety properties are very important. In fact, at present, the eco-friendly features of the refrigerant is a major factor in deciding the usefulness of a particular refrigerant. 

Economics.

Some products are listed below you may check out them:-

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