Innovative solution in Spain converts airflow into renewable energy

In a recent article, Jason Deegan highlights that Spain has pioneered an exciting new approach by harnessing the airflow generated by HVAC systems as the world continues to seek innovative solutions for clean and renewable energy. 

In the quest for clean and renewable energy, every idea is valuable, particularly when it uncovers a hidden treasure in what was once considered a wasted resource. A recent breakthrough in Spain demonstrates how we could tap into energy from a source that has long been neglected: the airflow produced by HVAC systems—heating, ventilation, and air conditioning.

Researchers from the Distance University of Madrid have been investigating an innovative method to capture energy from artificial air currents, which are usually regarded as wasted, and convert it into electricity. The secret to this transformation lies in small, compact vertical turbines. These turbines, selected for their size and ease of installation, can be mounted onto HVAC systems to efficiently harness energy that would otherwise be lost.

With a nominal power output of 9 kW, these turbines are proving to be perfect for integration with HVAC systems, providing a way to generate clean energy without needing major modifications to existing infrastructure.

This technology has already been applied in a real-world setting at a data center in Colombia, where it was tested with promising results. A single installation of vertical turbines was able to generate approximately 468 MWh of energy annually. The data center used Liebert HPC-M coolers equipped with eight EC-FAN fans running at 480V and 900 rpm, which create a consistent vertical airflow crucial for cooling the center's IT equipment.

What makes this system especially noteworthy is that the HVAC airflows, which are typically considered a byproduct of operations, can now be converted into a valuable energy source.

The turbines utilized in the project are the Tesup V7 models, known for their compact size and lightweight build. These characteristics enable easy installation on cooling devices without compromising their performance. In total, six of these turbines could be installed on the cooling equipment, generating an estimated 513.82 MWh annually. Each turbine would contribute approximately 85.64 MWh, ensuring a dependable energy source throughout the year.

Surprisingly, the answer is yes. Despite the initial investment and ongoing operational costs, the energy generated by these turbines provides a substantial return. The cooling fans at the data center consume a total of 336.39 MWh per year, but after installing the turbines, the net electricity production increases to approximately 467.6 MWh. This results in a surplus of energy, which can either be fed back into the local power grid or used for other purposes within the center, enhancing its energy independence.

From an economic standpoint, the project is also highly promising. The initial cost for purchasing and installing the turbines and related equipment is around 111,540 euros, with annual maintenance expenses of 1,005 euros. Despite these costs, the cash flow turns positive by the third year, offering an impressive internal rate of return (IRR) of 50.69 per cent over a 20-year period.

In addition to the economic benefits, the installation of vertical turbines offers substantial environmental advantages. The system is projected to cut CO2 emissions by approximately 300 tons annually, supporting efforts to combat climate change and contributing to a more sustainable energy future.

In conclusion, Spain's groundbreaking approach to harnessing HVAC systems for renewable energy is a game-changer. Airflow, once seen as a waste byproduct, can now play a role in generating clean energy. This cost-effective solution enables businesses and organisations to reduce both their energy consumption and carbon footprint, providing a meaningful step toward a more sustainable future.

By Naila Huseynova