A German research team has prototyped an extraordinary heating/cooling system that stresses and unloads nickel-titanium "muscle wires" to create heated and cooled air at twice the efficiency of a heat pump or three times the efficiency of an air conditioner. Crucially, the device also uses no refrigerant gases, meaning it's a much more environmentally friendly way to heat or cool a space.
.. Continue Reading Refrigerants not required: Flexible metal cooling prototype demonstrates extreme efficiencyCategory: Materials
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from New Atlas (Gizmag) https://ift.tt/2Hfjz5v
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