1. A Reversible Heat-Pump Promises a Cheap Way to Store Renewable Energy on the Grid

    A Reversible Heat-Pump Promises a Cheap Way to Store Renewable Energy on the Grid

    It was while hang-gliding that Jonathan Howes, a British aeronautical engineer, came up with an idea for a meteorologically powered engine to fly him between thermals, the columns of rising air which glider pilots use to gain altitude. It would use a thermal’s updraught to turn a small turbine which captured some of the thermal’s energy, for storage. Then, when in level flight, the pitch of the turbine blades would change and it would become a propeller driven by that stored energy.

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