TL;DR
A new study from Arizona State University finds that data centers in Phoenix can increase nearby air temperatures by as much as 4°F due to waste heat. This localized warming could influence urban heat islands and public health, especially during extreme heat events.
Arizona State University researchers have confirmed that data centers in Phoenix can raise ambient air temperatures in nearby neighborhoods by up to 4°F, highlighting a previously underrecognized local heat hazard.
The study, published in the Journal of Engineering for Sustainable Buildings and Cities, involved direct, real-time temperature measurements around four Phoenix-area data centers. Researchers mounted high-precision sensors on vehicles to record temperature differences up to a third of a mile from the facilities, which ranged from 36 to 169 megawatts in capacity.
Findings indicated that air temperatures downwind of these data centers were on average 1.3 to 1.6°F warmer than upwind conditions, with peak increases reaching 4°F. The thermal plumes created by the facilities’ cooling systems were observed to extend over about five city blocks, affecting local microclimates and possibly contributing to urban heat island effects.
Why It Matters
This localized heat increase has significant implications for public health, especially during extreme heat waves, as even a 1°F rise can lead to increased cooling demands and health risks. The findings suggest that data centers, which are expanding rapidly, could cumulatively contribute to urban heat challenges, particularly in already vulnerable communities.
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Background
Data centers are a growing component of urban infrastructure, with US capacity projected to more than double by 2030. Prior estimates of their heat impact relied on satellite data, but this study provides the first direct measurements of their real-time effects on neighborhood air temperatures. The research underscores the need for urban planning considerations regarding data center siting and cooling strategies.
“Even if these data centers only contribute to an additional heat island magnitude of one or two degrees, that can still have a very significant impact on our lives.”
— David Sailor, lead author and professor at Arizona State University
“As we do more measurements under different atmospheric conditions, I think we’re going to see more significant impacts around data centers.”
— Sailor
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What Remains Unclear
It remains unclear how these temperature increases vary under different weather conditions, times of day, or seasons. The long-term cumulative impact of multiple data centers across the city is also still being studied.
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What’s Next
Researchers plan to expand data collection to include diverse weather scenarios and larger geographic areas. They aim to develop models to predict and mitigate heat impacts, potentially informing city policies and data center design modifications.
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Key Questions
How do data centers increase local temperatures?
They discharge heated air from cooling systems, creating thermal plumes that raise ambient temperatures in nearby neighborhoods.
What is the significance of a 4°F temperature increase?
A 4°F rise can exacerbate urban heat island effects, increase cooling demands, and pose health risks during heatwaves.
Are all data centers responsible for this impact?
The study focused on four specific facilities in Phoenix; impacts may vary depending on size, cooling methods, and location. More research is needed for comprehensive assessment.
What can be done to reduce this heat impact?
Potential solutions include facility design modifications, use of green buffers, and strategic siting to minimize downwind thermal effects.
Will this impact grow with the expansion of data centers?
Yes, as data center capacity increases, their cumulative heat contribution could become more significant, emphasizing the need for mitigation strategies.
