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19-year-old Filipina invents air-con without refrigerant

A 19-year-old Filipino student has invented an energy-efficient air conditioning unit that does not use hydrofluorocarbons. In fact Maria Yzabell Angel Palma, a mechanical engineering student at De La Salle University – Manila, developed an air conditioning unit that did not use any chemical refrigerant whatsoever, Philippine Lifestyle News reported. Palma said she invented the […]