Technical Description of refrigerator and an Electric Iron

 

Technical Description of a refrigerator

A refrigerator is a domestic appliance for storing the eatables and keeping them fresh for a longer duration. It looks like an insulated cupboard having copper coils for heat transfer at its back and racks inside for storing eatables and bottles besides an ice chamber for ice. Some refrigerators have two doors, one for eatables and other for an ice chamber. It uses a fluid like Freon gas or other fluid like R-600a as a refrigerant which when released at low pressure, vaporizes and causes a cooling effect.

It has a compressor at its bottom. The compressor driven by electric motor compresses vaporized refrigerant sucked from the evaporator and presses the refrigerant into the condenser coil situated at the back of the refrigerator. Compressed refrigerant releases heat from the condenser coil into the atmosphere and turns into liquid. From the condenser, refrigerant passes through an expansion valve or a capillary made of thin copper tubing which has a number of turns and looks like a copper coil. The refrigerant released at low pressure moves into the evaporator where it absorbs the heat of the cooling chamber and causes cooling effect and is ready for suction by the compressor.

Thus, refrigerant keeps moving and cooling the inner chamber of the refrigerator. A thermostat regulates the internal temperature of the refrigerator at a preset temperature by switching the compressor off or on.

A light is provided inside the fridge which is automatically switched on when the door is opened and switched off when the door is closed.

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Since some students want very concise technical description, here is another version of Technical description of Refrigerator in 78 words only. 

Technical description of a Refrigerator

A refrigerator is a well-insulated appliance designed to keep food and beverages cool and fresh by continuously removing heat from its interior. 

It works on the principle of heat transfer, using a refrigeration cycle that moves heat from inside the cabinet to the surrounding air. 

The process is powered by a heat pump system and a special working fluid known as the refrigerant, which circulates through a closed loop of components — the compressor, condenser, expansion valve, and evaporator.

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If you add some more details to the above version, it will become slightly better. Here is one more version of Technical description of Refrigerator which has some more details. 

Technical description of a Refrigerator

A refrigerator is a well-insulated appliance designed to keep food and beverages cool and fresh by continuously removing heat from its interior. 

It works on the principle of heat transfer, using a refrigeration cycle that moves heat from inside the cabinet to the surrounding air. 

The process is powered by a heat pump system and a special working fluid known as the refrigerant, which circulates through a closed loop of components — the compressor, condenser, expansion valve, and evaporator.

Main Components and Their Functions

• Compressor 

It compresses the refrigerant gas, raising its pressure and temperature so that it can release heat effectively in the condenser.

• Condenser:

Located at the back or bottom of the refrigerator, it allows the hot, high-pressure gas to lose heat to the surroundings and condense into a liquid.

• Expansion Valve (or Capillary Tube):

A pressure-reducing device that converts the high-pressure liquid refrigerant into a cold, low-pressure mixture before entering the evaporator.

• Evaporator:

Found inside the refrigerator compartment. The cold refrigerant absorbs heat from stored items and evaporates back into a gas, creating the cooling effect.

• Refrigerant:

A special chemical compound that continuously changes state (from gas to liquid and back), enabling heat absorption and release during the cycle.

• Insulation:

The thick, sealed walls of the refrigerator prevent external heat from entering and retain the cool temperature efficiently.

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Technical Description of Electric Iron

An Electric Iron is an ironing machine which is heated by electricity and removes shrinkages from the clothes. Previously, people used the ironing machine which was heated by burning coal. It was made of iron and looked like a small iron box having a chamber to fill the coal in it. The chamber had an opening lid on it which after filling the coal could be locked.  It had a pointed nose and a flat and smooth bottom which after being heated was pressed on the shrunk cloth on a soft and flat surface. This process was able to remove the shrinkages from the cloth. Hard shrinks could be removed by wetting the cloth with a few drops of water. The machine was heated by burning the coal in it. But this machine had a disadvantage. It took a very long time to heat and emitted a lot of smoke before one could iron clothes by it. This machine is still in use but electric iron is much better than it. An electric iron is very much similar to it but the difference is that it has an electric element inside it to heat its bottom.  Some irons have a complete steel body while some irons have a plastic fiber body except the bottom which is made of steel having smooth surface. Nowadays, the bottom of the iron is coated with Teflon which makes it nonstick. Some irons come with a thermostat, temperature regulator and auto power cut system. 

The thermostat senses the temperature and cuts the power if it goes above the preset temperature and restart heating by resuming the power if it goes below the preset temperature. Some irons have an arrangement of filling water in it and they release steam from the bottom while ironing the clothes. Such an iron is known as steam iron.

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