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Group no - 5 1.Saykat Islam ................... – ID# 15107018 2.Fazle Rabb……………………..– ID# 15107019 3.Md.Sihan Ahmed Simoon…– ID#15107049 4.Md. Irfan Uddin ……………… – ID# 15107054 5.Md. Yaqub Arafat …………… – ID# 15107072

Refrigeration system and modern refrigerators. First general Electric "Monitor-Top" refrigerator, introduced in 1927. Latest glass door refrigerator

what is refrigeration Definition of refrigeration: The process of keeping an item below the room temperature  in a system, its freeze. The history of artificial refrigeration began when Scottish professor William Cullen designed a small refrigerating machine in 1755. Cullen used his refrigerator  diethyl ether. The experiment even created a small amount of ice, but he had no practical application at that time.

Use of refrigeration process in machines Now a days Refrigerator is a most common machine in our country. . The first cooling systems for food involved using ice. Artificial refrigeration began in the mid-1750s, and developed in the early 1800s. Now lets know about refrigerators.

History of refrigerators Before the invention of the refrigerator, icehouses were used to cool storage for most of the year. Which was packed with snow and ice during the winter season, It was actually natural process. The first practical vapor compression refrigeration system was built by James Harrison, He used compression system ether, alcohol and ammonia .  A self-contained refrigerator, with a compressor was invented by Mellowes in 1916. .

The first refrigerator of general electric monitor. This refrigerator used sulfur dioxide as refrigerating medium which was harmful for eyes. and skin burn or methyl format which was highly flammable. The problem was solved by Freon which was invented in 1920.

Main components of Refrigerators 1. compressor Hermetic Piston Refrigerator R600a Compressor

2. Capillary tube Capillary tube is used to keep communication between compressor and condenser.

3. Condenser It is  a device or unit used to condense vapor into liquid. It radiate heats in the air. It is attached at the back side of the refrigerator.

4. Evaporator It is a inner part of refrigerator. It remains close to the foods and meats. When the compressed Freon gas pass into it takes heat from foods and give the heat to the Freon gas.

5. Temperature sensor This sensor is used to maintain the thermo system of a refrigeration . When the foods and drinks are cold enough, it stops the compressor. By doing this it saves energy and money.

6. Ice maker Ice pot Ice maker make water to ice and in the ice pot ice are stored. They are situated In the deep part.

7. Treys and pots

8. Monitor of Modern Refrigerators

9. Doors of refrigerators

10. Deep part of refrigerator.

11. Lower or normal part of refrigerator

Mechanism and process of refrigerators. The main task of a refrigerator is to take out the heat from the inner part of it. For this process refrigerator use a gas name Freon for heat transfer medium. There is some mechanism and process for this process which is invented after a lot of experiment. So lets see how it works. .....

Compressor Compressor is a device that create pressure on gas and decrease the volume of gas. There is a piston inside of it. The piston helps to create the Pressure on the gas. Actually it has a great importance to do the refrigeration Circle. It is like the heart of refrigerators. There is a variety in compressor as their capacity. It decrease the volume of Freon gas by Creating pressure and turn the Freon gas into liquid . When this liquid Freon gas runs into the evaporator, takes the heat from foods and the gas increase its volume for the heat and low pressure. Then the compressor Creates some empty space so that the Freon gas can come again into the compressor. Thus it keeps the circle on.

Evaporator It is a inner part of refrigerator. It remains close to the foods and meats. When the compressed Freon gas pass into it takes heat from foods and give the heat to the Freon gas. It is actually heat transfer medium between the inner part and the Freon gas. Condenser Condenser transfer heat from Freon gas to the atmosphere. Being Attached at the back side of refrigerator when the warm vapor of Freon gas pass through it, it takes the heat and the volume gas increases. Then the gas goes to compressor again.

Now lets enjoy a video clips about the refrigeration process Up to now we discussed about mechanism and process of refrigerators with diagram . Now lets enjoy a video clips about the refrigeration process of a refrigerator ..........

The worlds best brand for modern refrigerators Whirlpool

Kenmore brand’s refrigerators

Asko brand’s refrigerator

LG brands refrigerators

Samsung brands refrigerators

In Bangladesh walton is the best brand for refrigerators.

My one refrigerators Bangladeshi product

Prizes of Refrigerators of different brands Whirlpool – starts 50,000tk to 1,5000tk and more Kenmore – starts 45,000tk to 1,3000tk and more Asko – starts 42,000tk to 1,2000tk and more LG – starts 37,000tk to 1,0000tk and more Samsung – starts 35,000tk to 80,000tk and more Walton – starts 28,000tk to 50,000tk and more My one – starts 23,000tk to 45,000tk and more

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