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June 26 2019
in Energy

Metro energy: the Lausanne team system

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tags: geothermalmetrotrains

A Lausanne team estimated the heat that passes through the underground tunnels and designed a geothermal system to extract energy from the metro

Gianluca Ricciodi Gianluca Riccio
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The subway tunnels are full of trains, electricity and people crammed into little space like sardines and launched at high speed. In theory, all the heat produced by these elements can be a large source of energy.

Today, researchers from the Lausanne Polytechnic University (EPDFL) have estimated the amount of heat that passes through the metro tunnels and have designed a geothermal heat recovery system that could provide energy to heat (or cool) thousands of nearby homes.

The Lausanne Polytechnic, home of the study on how to derive energy from the metro

The underground air passing through the underground tunnels has many origins. It comes up from the ground. It comes out of accelerating and braking trains. It is given off by electronic devices such as lights and signals. It also comes from the heat of the bodies of the many passengers. This is a lot of potential energy.

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Calculating the average amount of heat in these areas is rather difficult, but researchers from the Lausanne Polytechnic have developed a model that derives a precise energy coefficient. The formula can be used to create systems that collect this energy and bring it to the surface for residential use.

The concept behind this technology is similar to that of a giant fridge. Plastic pipes are integrated into the walls of the tunnels and filled with a thermally conductive fluid (even if water would be enough). By pumping liquid at room temperature and taking out the heated liquid from the underground activity, you're done.

The team declares that the system for obtaining energy from subways is efficient and economical to install, with a duration of over a century. Obviously, heat pumps would be the most delicate part of the system, and should be replaced approximately every 25 years.

Practical examples: the Lausanne Metro

To better understand the project to derive energy from the metro, the EPDFL team showed the data applied to the metro in the city where it is based, Lausanne in Switzerland.

“By setting up the energy recovery system in 60% of the underground network or 60 square kilometers of tunnel surface, we could meet the needs of 1500 apartments of 80 square meters. In the case of energy-efficient apartments up to 4000 homes. Inserting this system would cut CO2 emissions by over two million tons per year ”.

It is not the first attempt to derive energy from the meter. A few years ago Transport for London also tested a regenerative braking for the London Tube trains which would return energy to the electricity grid.

Energy must only be captured, in short. It is everywhere around us. And under.

The research was published in the journal Applied Thermal Engineering.

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The author

Gianluca Riccio, copywriter and journalist - Born in 1975, he is the creative director of an advertising agency, he is affiliated with the Italian Institute for the Future, World Future Society and H +, Network of Italian Transhumanists.

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