World's biggest heat pumps
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The pipe that will supply the heat pump, drawing water from the River Rhine in Germany, is so big that you could walk through it, fully upright, I'm told.
"We plan to take 10,000 litres per second," says Felix Hack, project manager at MVV Environment, an energy company, as he describes the 2m diameter pipes that will suck up river water in Mannheim, and then return it once heat from the water has been harvested.
In October, parent firm MVV Energie announced its plan to build what could be the most powerful heat pump modules ever. Two units, each with a capacity of 82.5 megawatts.
That's enough to supply around 40,000 homes, in total, via a district heating system. MVV Energie aims to build the system on the site of a coal power plant that is converting to cleaner technologies.
The scale of the heat pumps was determined partly by limits on the size of machinery that could be transported through the streets of Mannheim, or potentially via barges along the Rhine. "We're not sure about that yet," says Mr Hack. "It might come via the river."
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