Solar Pavement

The Dutch are sucking the heat out of pavement.  A company in the Netherlands has creaeted something called The Road Energy System.  In one example, the runways at a Dutch airforce base supply heat for the hangars.  An industrial park in the city of Hoorn is heated in the winter with 36,000sq ft. of pavement that is stored from the summer months. It’s kinda like a geotherm in the pavement.  A standard runway could heat and cool about 2500 homes.  It is also stated that if only 15% of all Dutch roads had this system, it would produce more energy than all the utilities in Holland.

Wanna know how it works?   Ooms Avenhorn Holding BV explains it all.
Road Energy Systems^® consists of a layer of asphalt concrete that has a closed system of pipes running through it. The pipes are connected to underground aquifers (water-bearing sand). In summer the sun heats the asphalt concrete pavement, which in turn raises the temperature of the water in the pipes. The water is then transported to the heat source area, where it is stored for several months. As soon as autumn arrives, the system brings the warm water to the surface, where a heat pump raises its temperature to a level suitable for low temperature heating systems. The surplus thermal energy is used to keep the temperature of the asphalt concrete above freezing point. The asphalt concrete cools the water to the point where it can eventually flow to the cold source. In summer the process is reversed. Water is pumped up from the cold source and used to cool buildings. This warms the water, which then moves through the asphalt collector again, is heated further by the sun and then injected into the heat source in the ground.

Source: Ooms Avenhorn Holdings BV, Invisible Heating Systems