Data Center Waste Heat as an Emerging Urban Thermal Hazard: First Field Measurements of Neighborhood-Scale Air Temperature Impacts
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The Wayback Machine - http://web.archive.org/web/20260627134652/https://asmedigitalcollection.asme.org/sustainablebuildings/article/7/2/024501/1233035/Data-Center-Waste-Heat-as-an-Emerging-Urban Article navigation Technical Briefs Abstract Data centers are among the fastest-growing sources of concentrated anthropogenic heat in urban environments. Despite heat flux densities that exceed peak solar irradiance by a factor of 2–6, their thermal impacts on adjacent communities have never been directly measured or reported in the peer-reviewed literature. This short communication addresses that gap by presenting the first vehicle-based traverse measurements of air temperature in residential neighborhoods downwind of operational data centers. Five traverses at four facilities in the Phoenix, Arizona metropolitan area, ranging from a 36 MW single-building data center in Mesa to a 169 MW colocation campus in Chandler, reveal downwind air temperature warming as high as 2.2 °C, with average downwind air temperatures 0.7–0.9 °C warmer than corresponding upwind areas.
Thermal signatures were detectable at distances up to 500 m from facility perimeters. The 36 MW Mesa facility rejects waste heat equivalent to the electricity consumption of approximately 40,000 households, while the 169 MW Chandler campus is equivalent to over 180,000 households, both concentrated into footprints smaller than a single residential subdivision. With U.S.
data center capacity projected to more than double by 2030, these findings establish data center anthropogenic waste heat as a previously undocumented urban thermal hazard demanding attention from the data center and urban planning communities. Keywords: data centers, anthropogenic heat, urban heat island, vehicle traverse, thermal plume, Phoenix, building energy, cooling, environment, heat transfer, measurement 1 Introduction Anthropogenic heat (Qf) is the thermal energy released into the environment by human activities—principally fuel combustion, industrial processes, and building heating and cooling systems [1]. In cities, Qf compounds the urban heat island effect, with city-wide fluxes in major United States metropolitan areas typically ranging from 10 to 75 W/m2 [2–5]. The existing literature documents temperature elevations of 0.5–3.0 °C associated with urban anthropogenic heat fluxes, with an estimated air temperature sensitivity of approximately 1 °C for each 100 W/m2 [6] at the neighborhood scale. However, data centers generate heat fluxes of thousands of W/m2, far exceeding any previously studied urban source. The data center industry is expanding at an unprecedented rate. Global electricity consumption by data centers reached approximately 415 TW h in 2024, about 1.5% of worldwide electricity demand, and is projected to double to 945 TW h by 2030 [7]. The United States data center infrastructure consumed 183 TW h in 2024, over 4% of national electricity, with more than 5000 facilities nationwide [8,9]. The Phoenix, Arizona metropolitan area, is among the fastest-growing hyperscale markets, hosting facilities by NTT, CyrusOne, EdgeCore, Iron Mountain, Stream, and Apple, with hundreds of megawatts of operational capacity and thousands more proposed [10]. For example, the NTT PH1 facility measured in this study has a 36 MW critical IT load housed within 11,700 m2 of floor space in a two-story building [11]. Because newer data centers in Phoenix generally rely on sensible air-based cooling, virtually all electrical energy consumed by Information Technology (IT) equipment is ultimately converted to sensible heat; this yields a heat rejection density of approximately 3100 W/m2, exceeding peak solar irradiance (∼1000 W/m2) by a factor of three, concentrated near the ground level. For context, the average U.S. household consumes ∼10,500 kW h/year, an average draw of ∼1.2 kW (electricity only) [12]. A single 36 MW data center with a power usage effectiveness (PUE) of ∼1.3 [13], drawing ∼47 MW in total, therefore rejects heat equivalent to that emitted by approximately 40,000 households. The CyrusOne colocation campus in Chandler (PHX1–PHX8), another site measured in this study, comprises eight facilities totaling 186,000 m2 with 169 MW of critical IT capacity [14]; at the same industry-average PUE, the campus draws approximately 220 MW in total, rejecting heat equivalent to over 180,000 households from a single 34-ha site.
Despite this extraordinary thermal footprint, the localized air temperature impacts of data center waste heat on surrounding communities have never been directly measured or reported in the peer-reviewed literature. This gap is significant because many facilities are sited adjacent to residential neighborhoods (Fig. 1), and their air-cooled condenser arrays discharge air at temperatures 8–14 °C above ambient—often exceeding 50 °C during Phoenix summers—with air velocities of 2–4 m/s [15,16], creating thermal plumes that are advected downwind over inhabited areas. For example, the Iron Mountain Data Center (Fig. 1(c)) has cooling equipment located less than 50 m from the nearest three-story apartment building.