Although in general all sources of renewable energy are relevant to reduce the contamination, one of those that stands out for its impact on reducing carbon dioxide in the atmosphere is the energy thermosolarThis type of energy, although not new, has gained ground worldwide and is attracting the interest of many countries due to its ability to generate clean and sustainable energy using the heat of the sun.
What is solar thermal energy and how does it work?
Solar thermal energySolar thermal energy, also known as solar thermal power, is a form of renewable energy that harnesses solar radiation to generate heat. Unlike photovoltaics, which convert light into electricity, solar thermal power uses stored solar heat to heat a fluid, usually water or oil, to generate steam. This steam is then used to drive turbines and ultimately generate electricity.
This method is based on concentrating the sun's radiation using mirrors or lenses until temperatures reach approximately 450°C or higher. The accumulated heat is then transferred to a fluid which, in turn, produces steam when heated. This steam is used in a generator to produce electricity.
Applications of solar thermal energy
The main applications of solar thermal energy are not limited to the production of electricity in large plants, but are also integrated into sectors such as industry or the domestic sector. Some of the most common applications are:
- Domestic hot water production (ACS): Used for both domestic and industrial purposes, solar thermal energy can be used to supply hot water to homes, hospitals and other public buildings.
- Heating: By taking advantage of the heat generated by solar thermal systems, it is possible to heat buildings using heating systems, thus reducing the use of fossil fuels or electrical energy.
- Pool heating: In both public and private facilities, solar thermal energy is used to maintain the temperature of swimming pool water, optimising energy consumption.
- Industrial processesIn sectors such as food or chemicals, solar thermal energy can be used to produce high-pressure steam in production processes or to generate heat for different operations.
Environmental benefits of solar thermal energy
This type of energy not only contributes to the production of electricity and heat, but also has positive impacts on the environment, being a key technology in the fight against climate change.
Its main environmental benefits include:
- Reduction of CO2 emissions:By not depending on the burning of fossil fuels, solar thermal plants help avoid the emission of tons of greenhouse gases, thus reducing global warming.
- Constant and storable generation: Solar thermal plants have the capacity to store thermal energy for hours, which allows electricity to continue being generated even when the sun is no longer shining, increasing the stability of the grid.
- Minimal impact on the local environment: Although solar thermal plants occupy a large area, their installation has a very small impact on the local ecosystem, since they do not emit pollutants or toxic waste.
Disadvantages and challenges of solar thermal energy
Despite its many advantages, solar thermal energy continues to face challenges. important challenges that slow down their expansion.
- High investment cost: The initial infrastructure to build a solar thermal plant is quite high compared to other renewable sources such as photovoltaics. Although it pays for itself in the long term, the large initial investment can be an obstacle to its mass adoption.
- Land availability: This type of plant requires large areas of land, which can generate land use conflicts, especially if it is intended to be installed near protected natural areas or agricultural areas.
- Water consumption: Solar thermal power plants consume large amounts of water for their cooling processes. In places where water is scarce, this can become a significant problem.
- Solar flashing: Although solar thermal plants can store energy, they still depend on the availability of sunlight. Cloudy days can affect their production capacity, making them less reliable in less sunny climates.
How solar thermal energy contributes to sustainable development
Solar thermal energy is a key source in the search for sustainable alternatives that minimize environmental impact while meeting global energy needs.
Solar thermal plants, offering the possibility of generating electricity in large quantities without greenhouse gas emissions, are seen as a viable option to decarbonize the electricity grid in many regions. Additionally, its storage capacity makes it a technology with potential to guarantee energy supply in areas with high night-time demand, such as cities.
In countries such as Spain, which has more than 2.500 hours of sunshine per year, solar thermal energy is making a significant contribution to reducing fossil fuel imports, while also boosting job creation in the renewable energy sector.
In countries with sunny climates, this technology not only promotes energy independence, but also contributes to the diversification of the energy matrix, a fundamental step in mitigating climate change.
Solar thermal energy has proven to be a solution that, although with its own challenges, is consolidating itself as one of the most promising energies of the future due to its capacity to store energy and its low carbon footprint.