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How it works
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.
Environmental benefits
Research has shown that Road Energy Systems®:
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