Standard AC units cool buildings but contribute to global warming. New technology aims to change that
This past July was the hottest recorded month in human history. Heat waves smashed temperature records worldwide and even brought summer temperatures to Chile and Argentina during the Southern Hemisphere’s winter. It’s more than just a matter of sweaty discomfort. Severe heat is the deadliest of all weather events; in the U.S. alone, it kills more people each year than floods, tornadoes and hurricanes combined.
One well-known problem with current AC systems is their reliance on refrigerant chemicals, many of which are potent greenhouse gases. Some projects aim to replace these substances with less-harmful coolants—but even if they do, the refrigerants make up only a fraction of air-conditioning’s climate toll.
Even bigger efficiency gains are possible when dehumidification is paired with evaporative cooling, which takes the energy-intensive process called vapor compression out of the equation altogether. Vapor compression—the system by which standard AC works—moves a refrigerant through a cycle in which it is variably condensed and expanded, enabling it to absorb heat from inside and release that heat outside. Conversely, evaporative cooling is a simpler process.
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