A heating system for road pavements consists of embedded pipes or hoses, through which a heat-emitting fluid flows. The piping system in the road surface is connected by feed and return lines to a second system of pipes of hoses located in an environment at a higher temperature; a heat transfer medium flows by natural convection through the entire system. The heat transfer medium is of type which exhibits a charge of state between the liquid and gaseous states in the two temperature regimes encountered. More specifically, the heat transfer medium may be a freon, or an azeotropic mixture of methyl propylene glycol and water. Used for any type of road heating where ice or frost is particularly liable to form, more specifically for such regions as bridges, where the adjacent ground, a body of water such as a river or the like can be used as the heat source. The arrangement enables the operating costs to be kept to an absolute minimum since there is no heat input and no pumping is required.
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