The field of energy storage is extremely active with a constant stream of innovations being deployed to address some major design challenges. At the heart of this activity is the commercial drive to increase energy density (energy stored per unit mass), extend battery life and improve overall charge/discharge efficiencies in order to reduce unit costs and enhance product reliability. While great progress has been made in the last decade, certain industries still have a long way to go.
April 1886: the Brunkebergs tunnel
First ever example of a ground source heat pump?