February 28, 2024
How Does A Fridge Work?
The household refrigerator is a commonplace appliance. Because of this, it’s easy to forget that there’s actually some clever mechanisms within. This allows us to keep our food cold, fresh and tasty! The way it works is by using some scientific laws involving pressure and evaporation. In this guide we’ll explain how a fridge works to keep our food cold.
How Does a Fridge Work?
Let's Find Out...
- Step 1 – The Compressor - The compressor pumps in cold and low pressured refrigerant in a gaseous state. Then, the refrigerant is compressed. This compression heats and pressurises it.
- Step 2 – The Condenser - The hot and high pressured refrigerant is then channelled into the condenser. The condenser removes the heat and condenses the gas into a liquid. Ventilation Fins: The heat that is removed from the refrigerant is then released through cooling fins at the back of the fridge. This is why the back of your fridge can get quite warm, or even hot!
- Step 3 – The Expansion Valve - Then, liquid refrigerant is pushed through the expansion valve. Within this chamber, the pressure is suddenly dropped. This sudden drop in pressure causes the liquid to expand, with some of it rapidly turning into vapour. This change of state from liquid to gas has a cooling effect on the surrounding area.
- Step 4 – The Evaporator - Afterwards, cold refrigerant in a liquid state leaves the expansion valve and enters the evaporation coils. As it travels through, it absorbs any warm air inside of the fridge. Because refrigerants have low evaporation points, this absorption turns it back into a gas, therefore evaporating. This process has a cooling effect that keeps your fridge nice and cool. Finally, the cold and low pressure gas from the evaporator travels back into the compressor to begin the cycle again.
Should You Clean The Back Of Your Fridge?
It’s important to clean the back of your fridge because this is where your condenser coils are. When they are covered in dust, fur, or other debris, they do not perform as efficiently. That’s because these will trap the heat that is trying to escape.
What Type Of Gas Does A Fridge Use?
Fridges use a type of gas called refrigerant. However, many different types of refrigerants have been used since the first household refrigerator was invented in 1913.
The first refrigerants used are known as hydrocarbons. Isobutane and propane are examples of these. These were then replaced with chlorofluorocarbons (CFCs). However, CFCs were replaced by hydrofluorocarbons (HFCs) after CFCs were discovered to deplete the ozone layer.
Since then, many manufacturers across Europe, Asia and South America have gone back to using hydrocarbons. This is because HFCs were also found to be detrimental to the planet’s health.
Therefore, although hydrocarbons depend on non-renewable resources for their existence, they are currently the most environmentally friendly refrigerants.
FAQs
No, there is no such thing as a frost-free fridge. This is because a fridge should never reach temperatures cold enough to produce frost. If it does, you should adjust the settings on your fridge.
How a fridge water dispenser works will depend on if the model is plumbed or not. Non-plumbed fridges with water dispensers will have an interior water reservoir. These are removable so that you can fill them easily. Plumbed fridges, on the other hand, are connected to a main water supply. This allows the fridge to tap into a cold water source, so you can receive water directly from the fridge without the need to refill. Fridges will often have a water filter and/or softener to give you a better drinking experience.
