Technical FAQs 4

Can underground tunnels be used as heat exchangers?

This paper presents an unprecedented investigation of the thermal energy storage potential of underground tunnels used as heat exchangers, often called energy tunnels, with a focus on seasonal, medium-temperature thermal energy storage applications. The study is divided into two parts.

Can energy tunnels store thermal energy?

This study indicates storage efficiencies of energy tunnels of up to about 70%. Therefore, energy tunnels have marked potential to store massive amounts of thermal energy in the shallow subsurface for subsequent reuse.

How do energy tunnels work?

In fact, through diverse shapes in contact with the ground (e.g., prisms with cylindrical, egg-shaped, squared, or rectangular cross-sections), energy tunnels and other underground infrastructures involve an unchartered energy performance for heat storage.

How can thermal energy be stored around underground structures and infrastructures?

The storage of thermal energy around underground structures and infrastructures (equipped with piping networks with a circulating heat carrier fluid to operate as energy geostructures and infrastructures) can greatly improve the energy supply resilience and grid independence of cities, from the building to the district scales.

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Fast Charging of Energy Storage Containers for Tunnels

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