Japan's Heated Sidewalks resist Ice and Snow || Informative Facts
A sidewalk road heating system that uses sewer heat (Niigata, Niigata Pref.) The heat required for the system was set at 123 W/m2 by comparing heat required for snow melting to that required for freezing. The system is able to melt the snow up to a maximum snowfall intensity of 1.49 cm/h.
A heat exchanger extracts heat and uses it to raise the temperature of a liquid antifreeze that circulates through the heat radiation pipe installed under the pavement. This melts snow. Heat sources for heat pump systems include ambient air, ground heat and groundwater. Heat pump systems rely on electricity.
Furthermore, new methods have been developed in recent years to melt snow faster, including solar-powered road heating systems that circulate hot water and street sprinklers that spray warm groundwater
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