Peltier or Thermal diode is a diode that allows the flow of heat unidirectional and whose thermal resistance is different in one direction as compared to other direction. A thermal diode is a device whose thermal resistance is different for heat flow in one direction than that of heat flow in the other direction. I.e., when the thermal diode’s first terminal is hotter than the second terminal, heat will flow effortlessly from the first terminal to the second terminal, but when the second terminal is hotter than the first terminal, little heat will flow from the second terminal to the first terminal. Nowadays Peltier diode is used in very large quantities and it is a single port of diode. It is issued for two main purposes, one for making electricity and the other for getting its work done.
- Cooling of the laser diode.
- To cool the crystals.
- Cooling electronic components.
- It can be used to extract water from the air in dehumidifiers.
- In Refrigerators.