Swiss firm, Mirai Intex, revealed new heating and cooling systems at Chillventa which use air as the refrigerant. The company showed two products aimed at the heating, ventilation and air conditioning, and refrigeration markets at the show.
Neither of the systems any refrigerants, such as Freons or ammonia; they only use air as the refrigerant. The products use an 'air-cycle' system. And, they use 'super-precision' ball bearings which decrease the friction so much that there is no need for oil to lubricate them. The company says this also means the unit are very low maintenance and cheaper to run.
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