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Cooling system could replace air con and drastically cut energy use: Researchers have developed a coolant-free refrigeration device made from the metals lead, scandium and tantalum. It can reach maximum efficiencies of more than 60 per cent, almost double that of typical single-room air conditioning
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Cooling system could replace air con and drastically cut energy use

A heat-pump-like system that relies on a phenomenon called electrocaloric cooling could heat or chill a room almost twice as efficiently as standard air-conditioning units

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