gyroscope.com: Precision Stirling Engine Citat: "...Ultra Low temperature difference Stirling Engine...As long as one plate is warmer (about 5°c) than the other then the engine will run..."
Stanford School of Engineering. (2014, November 26). High-tech mirror beams heat away from buildings into space. ScienceDaily Citat: "..."As a result of professor Fan's work, we can now [use radiative cooling], not only at night but counter-intuitively in the daytime as well."...The first part of the coating's one-two punch radiates heat-bearing infrared light directly into space...This multilayered coating also acts as a highly efficient mirror, preventing 97 percent of sunlight from striking the building and heating it up...Together, the radiation and reflection make the photonic radiative cooler nearly 9 degrees Fahrenheit [5 °C] cooler than the surrounding air during the day. The multilayered material is just 1.8 microns thick, thinner than the thinnest aluminum foil. It is made of seven layers of silicon dioxide and hafnium oxide on top of a thin layer of silver. These layers are not a uniform thickness, but are instead engineered to create a new material. Its internal structure is tuned to radiate infrared rays at a frequency that lets them pass into space without warming the air near the building..."
