THE WORKING PRINCIPLE HEAT PUMPS
Principle of solar power generation using CDs
Key TakeawaysYou can create a functioning solar cell from a discarded CD using a few common materials.The conductive layer on the CD acts as a semiconductor, generating electron-hole pairs when exposed to light.CD solar cells can be used to power small electronic devices, making them a fun and educational DIY project.更多项目 [pdf][FAQS about Principle of solar power generation using CDs]
Air energy and heat storage system
Compression of air creates heat; the air is warmer after compression. Expansion removes heat. If no extra heat is added, the air will be much colder after expansion. If the heat generated during compression can be stored and used during expansion, then the efficiency of the storage improves considerably. There are several ways in which a CAES system can deal with heat. Air storage can be , diabatic, , or near-isothermal. [pdf]