Stirling parabolic dishes

One of the most common solar installations that we can find is the one formed by parabolic Stirling concentrators. Its large concentrator disks are responsible for concentrating the energy in the engines, responsible for the transformation. What is the parabolic Stirling dish?

The parabolic Stirling dish is a structure that makes it possible to harness the sun's rays and transform them into electrical energy. This parabolic dish consists of 3 processes, the first is the concentrator, then there is the continuous solar tracking and finally the Stirling engine. It is one of the elements used in solar thermal energy, with which electricity is obtained through the heat generated.

Stirling dish tracking system

The mission of this system is to continuously track the sun along two axes throughout the day. In this way, it is oriented perpendicular to the sun so that its concentrating mirrors point directly at the receiver.

It can be controlled by a computer and detect any type of malfunction or simply obtain information via the Internet, and can operate over long distances.

Solar Stirling Concentrator

The concentrator or parabolic dish is made to have the capacity to go from 10 to 50 kw, has a diameter of about 5 to 12 meters and is presumed to be 94% effective.

It consists of a reflective surface, which can be made of metallized glass or plastic. Its parabolic shape causes the incident sunlight to concentrate on a small localized spot, called the focus. This focus will be where the receiver is located, where the transformation process will take place.

Transformation process of the Stirling generator

First, the receiver will absorb as much concentrated energy as possible. Its purpose is to transfer this energy to the Stirling engine. They consist of a small cavity through which sunlight enters and which allows the heat not to be lost thanks to its insulation.

On the other hand, the Stirling engine, as its name suggests, works with the Stirling period, which is an external combustion engine. It is an efficient way for remote locations and uses an external heat source. Since this type of engine needs a high temperature to work properly, energy from the sun is a good way to obtain it.

Once in operation, it is sufficient to connect an alternator or electric generator to the mechanical output of the engine, which is responsible for generating electricity.


The costs are relative and this is due to the fact that, like any large source of electricity production, it requires a large investment due to the amount of equipment that must be acquired. The benefit is that it does not require fuel, so the investment is recovered in the long term, since maintenance is extremely economical.

Those who wish to form an energy source such as the parabolic dish Stirling must not only invest in the converters, but also have a suitable site at hand. This type of energy requires a large space for its location and although their size can vary, most are of large dimensions.

Advantages of parabolic dish Stirling dishes

One of the advantages of Stirling dishes is undoubtedly the production of electricity without the use of any type of fuel, since it is an economical but also ecological way of obtaining electricity without harming the planet with toxic waste, as they are usually produced with the electricity we normally know.

The maintenance is economical and that is why they are becoming an investment for large companies and countries, since they do not have to make large investments when it comes to maintenance.

It is also appreciated the ease of monitoring the operation of these disks through the Internet, which allows to solve any kind of inconvenience that may arise from great distances.

Its location in places far from the city is another advantage, since it will not interfere with the activities that normally take place in nearby cities in case it is necessary to replace any of these parabolic dishes or in case maintenance is required.

The Stirling parabolic dish generators are a great contribution in terms of energy saving and environmental care, since it takes full advantage of this inexhaustible fuel, such as sunlight, and gives way to a new generation where you can enjoy energy from nature.

Disadvantages of Solar Stirling Generators

The main disadvantage of this type of technology is the large amount of land needed, in proportion to the energy generated. This is because there must be a space between the disks so that they do not cause shadows between them and, therefore, affect their production.

In addition, the need for a control system to track the sun increases the complexity of the system. However, this is something that is increasingly controlled nowadays with new technologies, although it also requires an associated cost.

On the other hand, the high initial investment is another of its most notable drawbacks, although it is profitable in the medium and long term.