When you burn your finger you blow on it to cool it down so it is counter intuitive that putting a fan in an oven will make it hotter. This narrative is a beginner's guide to fan assisted ovens. It does not contain stock recommendations but should help you understand how these devices work and provide understanding into whether they are right for you.
How it works
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When you cook on a hob heat is transferred from an power source (the flame if you are cooking with gas) via conduction. This means that the hobs gets hot which makes the pan get hot which in turn makes the food get hot. When you cook in an oven you are working in a different way. The heat source is easily warming the food by transferring power to the air and it is the air which warms the food.
Warm air will naturally rise, this is known as convection. Accepted ovens rely on convection to move hot air colse to and keep a constant flow of heat going into food. The problem with this is that hot air will pool in the top of the cavity and end up heating the roof of the oven. This means that in order for the whole of the oven to be filled with hot air you first need to pre-heat the metal sides in order to stop them from soaking the power out of the air.
A fan-assisted oven (which is confusingly also known as a convection oven) soldiery air from the heat source directly into the centre of the cooking space so that whatever placed there gets hot. power is still transferred from the air to the walls but because the fan is permanently forcing hot air in and colse to the cavity it maintains a steady temperature.
What this means
1. Fan assisted ovens do not need preheating - Because the fan soldiery hot air directly into the cooking area a fan assisted oven whether takes no, or very little, time to preheat.
2. Fan assisted units provide even cooking - As both hot and cold air are pushed colse to the cavity the difference in the middle of the warmest and coldest places is reduced.
3. Fan assisted cooking is quicker - Because they replacement power more efficiently than quarterly machines they give the same results at a lower climatic characteristic and in less time. This is can be beneficial but it is also the reason why so many population end up burning their food when using a fan assisted oven.
Fan Assisted Ovens - A Beginner's Guide2 door compact refrigerator avanti refrigerator photo scanner feeder
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