Hackaday · Creativity & design

New York Subway Explores Geothermal Cooling

New York's subway system faces significant heat challenges, making traditional air conditioning impractical. Authorities are now investigating a geothermal solution as part of station upgrades.

Subway tunnels become extremely hot due to heat from trains, equipment, and passengers. This issue is common in underground rail systems globally, with older systems not designed for excess heat.

Unlike buildings, subway stations are hard to air condition due to vast, open tunnels and entrances. Pumping cold air would have minimal effect.

The Brooklyn Bridge 4/5/6 station, reaching 96°F (35°C) in summer, is a pilot candidate. A Thermal Energy Network (TEN) will be studied as part of upgrades.

A TEN system moves heat by drilling deep boreholes. Fluid absorbs station heat, transfers it to the cooler boreholes, and is chilled for recirculation.

Geothermal borehole technology is used elsewhere for cooling. Scaling it for New York's subway presents a challenge.

The project is a study to assess TEN feasibility and impact on comfort. Success could lead to wider adoption.

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