The biggest impediment in using renewable energy (solar and wind) is that it is intermittent. That is, the wind doesn’t blow all the time and solar energy depends on the time of day and weather. Energy storage is a key way these renewable energy sources can be made more useful.
A 14.9 million gallon tank in Germany will hold 98°C (208°F) water for use in district heating systems in Berlin. Excess solar and wind energy produced will be used to heat water, which can then be used later (after the sun sets or during periods of high energy demand). The tank is now being filled, and this process requires partially desalinating the water and removing the dissolved gases. One interesting note – the tank is expected to sink 6 cm (a little over 2 inches) into the ground as it is filled because of the weight. – Steve Terry, DTC HVAC & Refrigeration Instructor
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