Research Aims to Find Sustainable Cooling for Hot, Arid Areas

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by | Oct 16, 2023

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As the world grapples with the rising temperatures attributed to climate change, the demand for cooling solutions in hot, arid regions becomes increasingly pressing. Traditional air conditioning systems, though providing much-needed respite from the heat, are a significant contributor to global warming due to their use of potent greenhouse gases and energy-intensive operations.

In the face of these challenges, a collaborative team of researchers from McGill University, UCLA, and Princeton have embarked on a mission to find a sustainable, cost-effective alternative to conventional air conditioning systems. Their approach not only offers a solution for cooling but also promises to address the peril of heat waves during electricity blackouts.

Setting a New Standard in Passive Cooling

The researchers set out to achieve a new benchmark in passive cooling within naturally conditioned buildings, particularly focusing on hot and arid climates, such as Southern California. Their quest aimed to address a significant question: how can passive cooling techniques outperform conventional air conditioning units and improve indoor comfort?

The key to this breakthrough lies in harnessing the potential of radiative cooling materials, specifically in the context of architectural design. These materials are known for their ability to radiate heat into the outer expanse, even when exposed to direct sunlight.

Traditionally, such materials have been employed to prevent roofs from overheating and to enhance heat rejection from cooling systems like chillers. However, the research team recognized that there is untapped potential in integrating these materials more comprehensively into architectural designs.

Achieving Efficient Heat Rejection

The researchers’ approach was multifaceted, seeking not only to passively cool indoor spaces but also to maintain healthy indoor air quality. This presented a unique challenge because traditional methods of air exchange can inadvertently introduce heat into the building when the goal is to keep the interior cooler than the outdoor environment.

Lead author Remy Fortin, a PhD candidate at the Peter Guo-hua Fu School of Architecture, stated, “We found we could maintain air temperatures several degrees below the prevailing ambient temperature, and several degrees more below a reference ‘gold standard’ for passive cooling.” Crucially, they achieved this feat without sacrificing the vital need for healthy ventilation and air changes.

A Call for Holistic Collaboration

The researchers are hopeful that their findings will inspire a collective effort from materials scientists, architects, and engineers to incorporate breakthroughs in radiative cooling materials into architectural solutions.

Salmaan Craig, the principal investigator for the project and an assistant professor at the Peter Guo-hua Fu School of Architecture, expressed their aspirations: “We hope that materials scientists, architects, and engineers will be interested in these results and that our work will inspire more holistic thinking for how to integrate breakthroughs in radiative cooling materials with simple but effective architectural solutions.”

In a world where the demand for cooling solutions is ever-increasing, the work of this research team opens up new possibilities for sustainable, cost-effective, and eco-friendly cooling systems. As the planet faces the dual challenges of climate change and increasing urban heat, their innovative approach may play a pivotal role in ensuring a more sustainable and cooler foundation for hot and arid regions.


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