Are Cool Pavements All They’re Cracked Up to Be?

06/28/2017 |

The unexpected consequences of reflective paving

Reflective pavement can go a long way toward reducing the urban heat island effect, but the embodied energy and emissions in some materials may present unexpected drawbacks, according to new research from the DOE’s Lawrence Berkeley National Laboratory.

The research team conducted lifecycle assessments of conventional and cool pavement materials and simulations of building energy consumption to examine the environmental impact of each material’s full lifecycle. Asphalt concrete, the most common material used for pavement, is dark and has a low albedo (a measure of solar reflectance). Cement concrete is lighter, and thus has a higher albedo, but it requires a high-temperature process that is considerably more energy- and carbon-intensive than making asphalt from petroleum. Albedo affects buildings by reflecting more or less sunlight to them and by changing the outside air temperature, though a higher reflectance is generally considered a positive as less heat is absorbed.

The researchers also compared the two types of concrete to reflective coatings as well as pavement that includes industrial waste products like slag and fly ash as a way to replace some of the energy-intensive cement in concrete. The energy and emissions associated with each pavement type’s materials and construction were paired with a regional climate model and simulated building energy consumption to determine the likely impact on buildings. The team was surprised to find that in most cases, the extra energy embodied in the cool material far outweighed the energy savings from increasing the albedo.

“Over the lifecycle of the pavement, the pavement material matters substantially more than the pavement reflectance,” explains Ronnen Levinson, a researcher in Berkeley Lab’s Heat Island Group. “I was surprised to find that over 50 years, maintaining a reflective coating would require over six times as much energy as a slurry seal. The slurry seal is only rock and asphalt, which requires little energy to produce, while the reflective coating contains energy-intensive polymer.”

Connectrac® wireways are the new standard for bringing power & communications cable management to all interior applications. Free yourself from core drilling!

Surpass State Energy Requirements with Dual-Cooling Data Center CRAC Technology

See how professionals like you are taking advantage of the highest performing precision cooling system for their computer rooms and data centers, and why Data Aire is fast-becoming the number one choice for facility managers and building owners looking to decrease their energy consumption. 

Data Aire understands how digital technology and data gravity is rapidly impacting and transforming businesses. That’s why they developed ultra-efficient cooling technology to support the most modern (and not-so-modern) data centers.  Learn how One Wilshire in Los Angeles, one of the most advanced carrier hotels today, is surpassing California's strict energy efficiency requirements with Data Aire’s purpose-built system, which provide full-economization for 260 days – almost 72% of the year. That’s a measurable savings! Furthermore, the projected PUE on an annual basis for a full load is at or below 1.2.

Connectrac® wireways are the new standard for bringing power & communications cable management to all interior applications. Free yourself from core drilling!

Surpass State Energy Requirements with Dual-Cooling Data Center CRAC Technology

See how professionals like you are taking advantage of the highest performing precision cooling system for their computer rooms and data centers, and why Data Aire is fast-becoming the number one choice for facility managers and building owners looking to decrease their energy consumption. 

Data Aire understands how digital technology and data gravity is rapidly impacting and transforming businesses. That’s why they developed ultra-efficient cooling technology to support the most modern (and not-so-modern) data centers.  Learn how One Wilshire in Los Angeles, one of the most advanced carrier hotels today, is surpassing California's strict energy efficiency requirements with Data Aire’s purpose-built system, which provide full-economization for 260 days – almost 72% of the year. That’s a measurable savings! Furthermore, the projected PUE on an annual basis for a full load is at or below 1.2.


Related Coverage