Contents
How is heating and cooling possible with a Peltier controller?
This article describes how heating and cooling is possible with Peltier Controllers. Thermoelectric cooling (TEC) has become the method of choice for fast and compact temperature control. An electrical current through a so-called Peltier element produces an active heat transport.
What is the purpose of a Peltier module?
In most of these solutions the temperature of the object being cooled remains above the ambient temperature. Peltier modules are electronic devices designed for cooling objects to below the ambient temperature or maintaining objects at a specific temperature by controlled heating or cooling.
How does the Peltier element work as a heat pump?
Peltier elements function as a heat pump. During the heating operation the heat energy is extracted from the ambient air and fed to the interior. There is no exchange of outside air and the interior is thus not dehumidified.
Can a heat spreader be used as a Peltier module?
An area mismatch between the area available and the area of the Peltier module can be compensated for by the use of a low thermal impedance heat spreader. A simple heat spreader can be manufactured from aluminum or copper. Peltier modules are current-driven devices similar to LEDs.
Why are Peltier coolers used instead of classical compressors?
Instead of using a classical compressor, these fridges use Peltier modules for the cooling. The main advantage of these devices is that there are no moving parts, no chlorofluorocarbons (CFC), they are controlled by changing the applied current, they have a longer life and are easy to replace if they ever break.
Is the Peltier element’s capacity to cool infinite?
However, the Peltier element’s capacity to cool is not infinite: the more current the Peltier controller delivers, the more Joule heat is generated all conductors, including the thermoelectric element. This is a parasitic heating effect that will completely cancel out the desired cooling effect above a certain threshold.