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 a cupboard having 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 Freon gas 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 Freon gas sucked from the evaporator and presses the gas into the condenser coil situated at the back of the refrigerator. Compressed Freon gas releases heat from the condenser coil into the atmosphere and turns into liquid. From the condenser, Freon gas 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 gas released as 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.



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.

 

Location: Satna, Madhya Pradesh, India

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