Heat leaks from operating electronics are a serious problem. Scientists at the University of California at Berkeley have developed a film that, once applied to operating devices and mechanisms, will capture and recycle waste heat.
Many current systems of this type operate on a thermoelectric principle, generating electricity from the temperature difference between the two sides of the material. This is good when it comes to devices like JikoPower, which store heat from heated kitchen utensils and turn it into electricity to charge mobile phones. However, JikoPower is not efficient at smaller temperature differences.
The Berkeley team aims to create a device that uses low-quality waste heat with temperatures below 100 ° C. The film they created works on the principle of pyroelectric energy conversion at much lower temperatures, which allows it to be effectively used in electronic devices.
Scientists have created prototypes of devices that create thermal and electric fields, with which films from 50 to 100 nanometers thick interacted. During the experiments, it was possible to achieve an energy density of 1, 06 J / cubic cm, power density 526 W / cc. cm and Carnot efficiency (when a thermodynamic system performs mechanical work due to heat exchange) - 19%.
According to scientists, all this speaks about the prospects of the new technology.