How Does a Heat Sink Work and What Is Its Purpose?

If you have reached this point, you are probably wondering what a heat sink is, what it is used for, and how it works.

Some devices, such as desktop computers, laptops, or industrial refrigeration systems, experience overheating that can damage the device; the heat sink helps prevent this excessive heat.

In this Inditer blog post, we explain how a heat sink works. Grab a pen and paper and take note of the importance of this device for any equipment, including industrial applications.

Throughout this post, you will discover what a heat sink is, how it works, the types available, and the advantages of this system.

What is a Heat Sink?

Before explaining how a heat sink works, we will define what this component is.

Industrial Refrigeration Systems provide the industry with a fundamental tool for the preservation and processing of countless products we consume daily.

One of the fundamental components in these systems is the heat sink (condenser), whose mission is to extract heat from the chamber to the outside, based primarily on the zero law of thermodynamics.

A heat sink is actually a heat exchanger that extracts heat from one fluid and transfers it to another (ambient air, for example). Alternatively, it extracts heat from the environment to transfer it to a fluid. These exchange processes are key in any industrial refrigeration system.

In other words, this device is used to reduce the temperature of certain electronic components of devices, which is generated due to their use.

In the market, we can find a wide variety of heat sink types, depending on the needs and structure of the device: air heat sinks, liquid heat sinks, PC heat sinks, finned heat sinks, or thermosiphon tube heat sinks, among others.

As you can see, a condenser can be used in different mechanisms; however, in this post, we will discuss how a heat sink works in industry.

How Does a Heat Sink Work?

Basically, the operation of a heat sink, and generally any heat exchanger, consists of acting as a heat transmission mechanism from the hotter source to the colder source.

With this basic principle, we can heat or cool fluids that will later be used in various industrial processes.

When a device is in operation, one of its electronic components begins to generate heat. This occurs because electrons are in contact with the conductor, and it is known as the Joule Effect.

Due to the collision between electrons and the kinetic energy derived from this phenomenon, heat increases. The higher the energy level, the more heat the device consequently produces.

A heat sink consists of a metal block (aluminum, copper, etc.) with a thermal paste that is in direct contact with the device. The heat sink transfers heat energy from one device to a cooler environment.

Generally, these devices incorporate one or two fans that help dissipate heat more quickly.

Types of Heat Sinks Available

There are different types of heat sinks, all widely used in industry for fluid cooling in a wide variety of industrial processes.

The main types of heat sink systems found in industry are the following:

Active or Passive Heat Sink

There are two types of heat sinks: active and passive.

• Active heat sinks usually incorporate a mechanism that allows them to move air, such as a fan, which makes them more efficient; however, they tend to be more expensive. Additionally, they are often more compact than passive heat sinks, so they do not take up as much space.

• On the other hand, passive heat sinks dissipate heat energy conventionally and do not incorporate a system to help them move air, as is the case with active heat sinks.

In this case, the heat sink uses radiation to expel heat.

Knowing which of these categories a device uses is important to understand how a heat sink works, as there are slight differences between the two mechanisms.

Difference by Materials

A heat sink can also be differentiated by the type of material it is made from, such as those detailed below:

Steel

Steel is mainly used for shell and tube heat sinks, although we can also find steel finned tube heat sinks, and even plates.

Stainless Steel

Stainless steel is used in the manufacture of any type of heat sink, its use depending primarily on the application and the type of fluid that will circulate through it.

Aluminum-Copper

Aluminum and copper are mainly used in finned tube heat sinks, although plate heat exchangers made of this material can also be found.

Copper-Copper

This material is used in the manufacture of finned tube heat sinks.

Both elements made of this material provide a high level of corrosion resistance and high conductivity, but, conversely, they come at a high price. In summary, it is an excellent quality material, but less economical than the previous ones.

Additionally, copper is also used in the manufacture of plate heat exchangers.

By Manufacturing Process

Depending on the manufacturing process, we find the following heat sinks:

Shell and Tube Heat Sink

This type of heat sink consists, as its name indicates, of a shell and two tubes. Both tubes are mounted inside the shell, and the axis of the tubes is parallel to that of the shell.

This is how a shell and tube heat sink works: one type of fluid circulates through the tubes (internal flow), and another fluid flows externally in the shell (external flow).

Finned Tube Heat Sink

This type of heat sink consists of a series of tubes located in an airflow. The tubes have fins that increase the surface area for heat exchange and also the transfer coefficient.

The airflow can be forced by a mechanism that moves the air, or it can occur naturally.

How Does a Finned Tube Heat Sink Work? If a fan is used, it moves air through the finned tubes. The cooled fluid passes through the tubes until it reaches the ends, where the headers are located.

In this way, heat is transferred from one environment to another.

Plate Heat Sink

The last type we will examine in this article to understand how a heat sink works is the plate heat sink.

This mechanism consists of a set of thin, packed plates or corrugated metal sheets that have a high transfer rate.

The way this heat sink is manufactured allows for turbulent flows that dissipate heat at very low speeds.

How Does a Plate Heat Sink Work? Its operation is very simple: while heat flows down one plate, on the adjacent plate, the heat (or fluid) flows in the opposite direction. In this way, the two fluids never mix, thus dissipating the heat.

What is the Best Material for Heat Dissipation?

One of the key aspects to understanding how a heat sink works is knowing the material it is made from, and of course, depending on the type of material, it will be better or worse at dissipating heat.

The most commonly used materials in the manufacture of heat exchangers are primarily copper and aluminum. Copper is used for the tubes through which the fluid circulates, and aluminum for the exchange fins.

Inditer uses European copper tubing from leading manufacturers, as this is a key material that defines the final quality of the heat exchanger.

What Applications Can a Heat Sink Have?

As we mentioned at the beginning of this post, a heat sink can have many applications, being widely used, especially in industrial processes.

These are the main applications of a heat sink:

Air Conditioning Systems

Air conditioning is one of the devices that contain, among its components, a heat sink, specifically an evaporator and a condenser.

Radiator

The primary function of a radiator is to exchange water and air. When water enters through the pipes, these have soldered fins through which cold air is exchanged for a hotter liquid.

Freshwater Generator

Freshwater generators have two heat sinks in their structure. One of them is located at the bottom of this device, where a liquid, such as seawater, is introduced to be vaporized, and at the top, another heat sink to condense the vapor.

Advantages of Our Systems at Inditer

Inditer stands out as a leader in the calculation, design, and manufacture of heat exchangers (heat sinks), where its participation in countless projects has demonstrated a high level of reliability in the calculations and designs performed.

Adapted to Client Needs

Inditer works according to client specifications, from which a thermodynamic study of the heat exchanger is conducted, providing different thermodynamic solutions with high performance and reduced economic cost.

Quality with 3D Design Programs

Based on the calculations performed, Inditer meticulously designs each heat exchanger, adapting to the strictest design requirements previously specified by the client.

Commitment to the Environment

The optimization of the internal volume in heat sinks is always a factor to consider in our designs, as a reduction in the amount of refrigerant fluid implies a reduction in polluting emissions.

Flexibility and Versatility of Equipment

As previously mentioned, Inditer masters the entire design process, from thermodynamic calculation and 3D design to the manufacture of components, using premium raw materials and subjecting heat sinks to the most stringent quality controls.

All of this provides absolute versatility when offering solutions for the most complex projects.

Why Choose Inditer?

Now that you know how a heat sink works, if you are looking for the best professionals in the sector, you are in the right place.

Inditer is one of the most recognized companies in the thermal exchanger industry, with over a decade of experience.

Whatever your company’s needs, we have everything necessary for the design and development of heat exchangers, specialized equipment, climate air heaters or solar systems, regardless of your business activity.

If you are interested in acquiring one of our heat exchange systems, please visit our website. For any questions or inquiries, do not hesitate to contact us.