21 reviews of Tiffany & Company I was pleasantly surprised with the customer service at this location. I had it in my head that they would be beyond pretentious, from what I have heard in the past; but what I found were helpful salespeople,â¦
Thermionic generators convert heat or light into an electric current by using the temperature difference between two metallic plates that are separated by a vacuum. The hot plate is heated either by incident light or thermal conduction and this causes electrons to evaporate from its surface.
You can use the energy to spin up a flywheel and then later extract the energy by using the flywheel to run a generator. This patent has lots of information. You can store heat directly and later convert the heat to another form of energy like electricity. This page discusses some of NASA's experiments in this area.