Example of Heat Transfer by Convection – Has Grameds ever boiled water in a pot until it becomes hot, even though the water was very cold before? Well, that’s a simple example of the transfer of heat energy alias heat.

Discussion of how heat energy transfer alias heat in general can be found in Natural Sciences (IPA) subjects. However, if in detail, the transfer of heat energy alias heat turns out to be included in the study of Heat Transfer courses which are usually in the Mechanical Engineering department. Is Grameds interested in learning more about it?

Well, the process of transferring heat energy alias heat can occur in 3 ways, namely conduction (conduction), convection (flow), and radiation (radiation). Previously, Grameds was given an example of how heat energy is transferred in everyday life by convection (flow). So, what are other examples of heat transfer by convection that we often encounter in our daily lives? Let’s look at the following review, so that Grameds understands it.

10 Examples of Convection Heat Transfer

1. Refrigerator

The refrigerator that we often encounter at home is also an example of a real form of heat transfer or heat by convection. Generally, in the refrigerator there is a freezer that is placed at the top. The reason why the freezer is placed at the top is so that the warm air in the fridge will stay warm and not go to the freezer area.

2. Steam From Hot Tea

When brewing hot tea in a cup, Grameds will definitely see steam coming from the cup, right? Well, at first a cup of hot tea has a higher temperature, then over time, the temperature of the hot cup of tea will drop so that the heat becomes steam which evaporates into the air in the room. The transfer of heat from a hot cup of tea to the air is also an example of convection, you know…

3. The Occurrence of Land Breeze and Sea Breeze on Earth

The existence of land breezes and sea breezes on this earth is also an example of heat transfer by convection, aka flow. Land breezes are winds that occur at night, when the air pressure on land is higher than in the sea area, so that the air will move from land to sea. While the sea breeze is the wind that occurs during the day, namely when the air pressure in the sea is actually higher than in the land area, so the air will move from the sea to the land.

Heat energy, aka heat, which moves with air particles occurs when an intermediary substance in the form of gas or air particles is followed.

4. AC (Air Conditioner)

The reason why the air conditioner is placed on the upper wall is so that convection heat transfer occurs. Later, warm air will rise up to the air conditioner and the air will rise and be replaced by cold air. If that’s the case, then the air in the room can be cold.

5. Air Balloon

Has Grameds ever been on a hot air balloon? Or often watch it on YouTube videos or television? Well, in a hot air balloon, there will definitely be a heater located inside the hot air balloon. The heater will heat the air inside the balloon, so that the air can move upwards.

If this is the case, the balloon will rise because of the hot air trapped inside the balloon. Now, when the hot air balloon is about to go down, the hot air inside is released so that cool air will flow. The transfer of heat energy, aka heat, from the heater to the top of the balloon is a clear example of convection.

6. A Rainstorm Occurs

When warm air comes from the oceans and rises into the air, it turns into saturated water droplets that form clouds. Well, this process will continue until small clouds collide with each other and form large clouds over time.

7. Occurrence of Ocean Circulation

The process of oceanic circulation is when warm water around the equator moves in circulation towards the poles and cold water at the poles moves towards the equator. This natural event is one of the determinants of weather factors that occur on earth. Well, the transfer of heat energy in warm water around the equator can be an example of heat transfer by convection.

8.  Radiator

Usually, this radiator is a component of a motorized vehicle, be it a motorbike or a car. The radiator is a heat exchanger that is often used to transfer heat energy from one medium to another, so that the engine can stay hot and cold. In the radiator tool, there is a heat element that is placed at the bottom of the radiator tool engine itself. Well, the warm air from the heating element will later be replaced by cold air.

9. Occurrence of Movement in the Earth’s Mantle

Does Grameds still remember the inside of planet earth? Now, in the earth’s mantle which is part of the earth’s rock layers, it will move slowly due to heat transfer by convection. In this process, convection currents will move heat energy from the interior of the earth to the surface. These convection currents can also cause tectonic plates to move gradually.

10. Melting Ice Cubes

The process of melting ice cubes can be a form of change from solid to liquid. This condition can occur especially when the air in the room is hot. The ice rock will receive heat energy from the room so that it turns into a liquid. The heat in the room moves towards the ice through the air, causing heat transfer by convection.

Understanding What is Convection Heat Transfer

After knowing what are the examples of heat transfer by convection, does Grameds really understand what is heat transfer by convection? If you are still confused, let’s look at the following review.

Basically, heat energy, aka heat, is energy that can move from high temperatures to lower temperatures. A simple example that heat energy can move is when Grameds is in the sun, his body will feel warm. Well, there are 3 ways of transferring heat energy, aka heat, namely conduction (conduction), convection (flow), and radiation (radiation).

Heat transfer by convection is when heat energy, aka heat, transfers accompanied by the movement of parts of the substance, usually it can occur in liquids and gases.

“In short, heat transfer by convection is a transfer process that occurs when a liquid or gas that has a high temperature flows to a place where the temperature is lower, thus providing heat energy to the surface where the temperature is lower.”

Actually, the process of heat transfer by convection is almost similar to induction, except that the induction process occurs without an intermediary substance, while the convection process is actually followed by an intermediary substance. Even though heat transfer by convection just happens, it can be calculated using Newton’s laws, namely:

Information:

h = convection coefficient (the unit can be W/ m2.K

A = convection surface area

Ts = transient surface temperature

Tf = temperature in the fluid

Types of Heat Transfer By Convection

There are 2 types of heat transfer by convection, namely Free Convection or Natural Convection (Free Convection/Natural Convection) ; and Forced Convection . Here’s the description.

1. Free Convection or Natural Convection (Free Convection / Natural Convection)

This process of heat transfer by convection occurs because of the fluid flowing naturally, by not being pumped or exhaled. This naturally flowing fluid can occur because there is indeed a change in physical properties, especially in its mass density and the influence of the buoyant force. In short, this free convection process is when heat transfer is caused by differences in temperature and mass density, so there is no outside force to push it. Example: there is a hot plate that is left in the surrounding air without any external source of movement.

2. Forced Convection

This process of heat transfer by convection occurs when there is heat transfer of gas or liquid flow caused by external force. For example, a hot plate that air blows from a fan or fans.

Well, that’s a review of what are examples of heat transfer by convection that are often encountered in everyday life. Can Grameds name any other examples?

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