Turning train tunnels into giant “fridges” could heat thousands of homes

“Our research shows that fitting the heat-recovery system along 50 to 60 percent of the planned route – or 60,000 sq m (645,000 sq ft) of tunnel surface area – would cover the heating needs of 1,500 standard 80 m2 (860 sq ft) apartments, or as many as 4,000 Minergie-certified energy-efficient units,” says Margaux Peltier, lead researcher on the study. “Switching from gas-fired heating would cut the city’s CO2 emissions by two million tons per year.”

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