Researchers develop solar-powered runway anti-icing system

Nov 17, 2011
The researchers test site shows photovoltaic panels (foreground) providing power to a battery-storage system and concrete panels (background).

(PhysOrg.com) -- Engineering researchers at the University of Arkansas are developing an anti-icing system that could make airport runways safer and less expensive to maintain during winter months. The approach uses a conventional photovoltaic system to supply energy to a conductive concrete slab that would function as a surface overlay on runways. Energy conducted throughout the slabs allows them to continually maintain temperatures above freezing and thus prevent accumulation of snow and ice.

“Major U.S. airports do a good job of keeping runways safe and clear of ice and snow,” said Ernie Heymsfield, associate professor of civil engineering. “But this is a labor-intensive and expensive process, especially for northern airports. The St. Paul, Minnesota, airport, for example, budgets approximately $4 million annually for snow removal. For various reasons, including the fact that it is grid-energy independent, our system could put a huge dent in this budget.”

After initial design, Heymsfield now leads a team of researchers who are testing the slab at the university’s Engineering Research Center in south Fayetteville. The slab consists of two layers above existing soil and a gravel base.

The bottom layer – the first layer above the gravel base – is a 20-foot by 24-foot base slab that does not contain any conductive properties. Above the base slab is a surface layer that consists of twelve overlay panels, each 4 feet by 10 feet. Ten of these panels are made with a special concrete mix that conducts heat much like a cast-iron skillet exposed to a stove burner. Two control panels made of conventional concrete mix provide a basis for comparison to the conductive panels.

The photovoltaic system supplies DC power to electrodes embedded within the conductive concrete panels. The components of the photovoltaic system include an array of cells that convert sunlight into energy, a battery storage bank and a regulator to control energy between the array and the batteries. Energy is transferred from the batteries to the electrodes. The intrinsic thermal-mass properties of the concrete mix also enable the slab to absorb large amounts of heat from ambient temperature conditions, which minimizes the cost of the .

Preliminary tests showed that although heat flow was non-uniform and concentrated on an area near the energy source, the conductive panels responded much faster to extreme surface temperature reductions after the researchers applied a thin layer of ice. Heymsfield said the non-uniformity and concentration of heat flow will be corrected by modifying the electrode configuration. The researchers will continue testing the system through the 2011-12 winter season.

If successful, the modified pavement could be an alternative to current snow and ice-removal methods, which include plowing, blowing and applying chemicals. There are various pavement de-icing methods, including chemical, thermal, electric and microwave, but these methods are expensive because they rely on grid power or require a high number of airport personnel.

Since 1978, slush, ice or snow has contributed to approximately 100 accidents and incidents on U.S. runways involving jet or turboprop aircraft weighing more than 5,600 pounds.

Initial results of the study will be presented at the Transportation Research Board’s annual meeting in January 2012.

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Silverhill
not rated yet Nov 17, 2011
I suppose that the system has some self-heating capacity also, to get the snow and ice off the solar panels with minimal work.

The batteries will need to be able to keep a charge for some days until needed, because the weather that puts snow and ice on the ground tends to heavily block the Sun....
Yvan_Dutil
not rated yet Nov 17, 2011
It would be probably much more efficient to directly use hot water to do the same thing. Why do simple, when you can complicate things.
NotAsleep
not rated yet Nov 18, 2011
I wish the article title gave credit to the real innovation: runway-grade conductive concrete.

@ Yvan, using hot water wouldn't make it simpler. Although I haven't seen any technical specs on this, it appears as though they've made a "standard" concrete that conducts electricity. No pipes or wires are required. Runways must be extremely well built to prevent cracks/heaves/etc. The more incongruous you make the concrete (i.e. by adding pipes) the more likely it is to be compromised.

Deicing runways is a huge problem. If this tech works, everyone with an airfield would want to install it

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