RobertM Posted July 8, 2022 Share Posted July 8, 2022 (edited) In a corner of a small power plant in western Finland stands a new piece of technology that has the potential to ease some worries for Finland after being cut off from Russian energy. The key element in this device? Around 100 tonnes of builder's sand, piled high inside a dull grey silo. These rough and ready grains may well represent a simple, cost-effective way of storing power for when it's needed most. The device has been installed in the Vatajankoski power plant which runs the district heating system for the area. Low-cost electricity warms the sand up to 500C by resistive heating (the same process that makes electric fires work). This generates hot air which is circulated in the sand by means of a heat exchanger. Sand is a very effective medium for storing heat and loses little over time. The developers say that their device could keep sand at 500C for several months. So when energy prices are higher, the battery discharges the hot air which warms water for the district heating system which is then pumped around homes, offices and even the local swimming pool. https://bbc.in/3bUxEpB Edited July 8, 2022 by RobertM Quote Link to comment Share on other sites More sharing options...
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