The hum of refrigerators is so constant in our daily lives that we barely notice it. Yet that background buzz is the ...

The cycle has now been "reversed" in an efficient machine for cooling things to very low temperatures In 1816 Robert Stirling invented an engine that operated by heating and cooling air in a ...

That's it. That is what the refrigeration cycle is all about. We are not creating heat—just transferring it. If we get literal, every refrigeration system is a heat pump. Your refrigerator? A heat ...

The Thermavault refrigeration unit can keep vaccines cool with a reusable salt solution. The teens who built it plan to test ...