Innovative Solar Concentration Using Mirrors Promises Cost-Effective Industrial Heat Solutions
A significant challenge in the industrial sector is managing energy costs, which drive companies to seek more efficient and sustainable solutions. Solar energy has been a key focus, but recent developments suggest that alternative technologies could further lower costs and increase practicality.
In Extremadura, researcher David Larra from the University of Extremadura has led a pioneering study on a mirror-based solar thermal system. This technology focuses on directly harnessing solar radiation through an array of flat mirrors that track the sun and reflect sunlight onto an elevated tube. Inside the tube, a fluid is heated to produce thermal energy suitable for high-temperature industrial processes, such as chemical, food, and textile manufacturing.
The study, published in April 2026, analysed the real-world performance of a Fresnel solar plant in Caceres over a period of 742 days. After filtering out days affected by technical issues or insufficient sunlight, the data from 145 optimal days revealed insightful seasonal variations in efficiency. The system achieved an average efficiency of 18% during winter, rising to 27% at the equinoxes, and reaching 35% in summer, with peaks surpassing 50% during June hours.
One of the key findings emphasises the importance of maintenance, particularly cleaning the mirrors and calibrating the solar tracking system. These actions significantly impact the systems consistency and performance. The analysis also measured the mirrors reflectivity to understand the effects of wear and tear over time, providing valuable insights into operational optimisation.
This technology offers a more affordable alternative to conventional photovoltaic panels by directly converting solar heat rather than electricity. Its design involves simpler structures with basic materials such as glass, steel, and aluminium, which reduces both initial investment and installation complexity. The modular nature of these systems allows flexible deployment on factory rooftops or available land, making them adaptable to various industrial settings.
Generating heat above 300 degrees Celsius, this system meets the thermal demands of several sectors, potentially replacing traditional fossil fuel-based boilers. Its environmentally friendly materials, such as recyclable glass and steel, further enhance its sustainability profile by reducing lifecycle impact.
While promising, the technology does have limitations; its performance depends on stable solar radiation, and it requires vigilant maintenance. Nonetheless, the real-world data demonstrates that Fresnel mirror-based solar thermal systems can be cost-competitive with existing thermal solutions. Ongoing optimisation aims to refine system control, improve efficiency, and expand utilisation in industries where thermal energy consumption is substantial.