By the flow of electric current, the Peltier Element can be used for cooling/heating – similar to a traditional heat pump. Due the fact that for a good performance a high electrical conductivity but a very low thermal conductivity is required, semiconductors are usually used for such elements.
Basically this example demonstrates the use of a Peltier element in a steady state cooling system. The model consists of a cold and of a hot side, whereby electric current is used to cool down an air flow. Both sides of the element are connected by a heat conduction element with a very small lambda value. Keep in mind that due to the use in a steady state model, the point mass is only used for modeling the heat transfer, therefore the simulation ignores the thermal inertia.
Basically the amount of heat rejected / absorbed by each side is the sum of the Peltier effect (current [A] * temperature of the cold side [K] * alpha [V/K]) and half the Joule heat (0.5*current [A] * current [A] *resistance [Ohm]). Cause of the current being squared for the Joule heat, at a certain point increasing the current will lead to a reduced cooling effect (for high currents the cooling effect can even turn into a heating effect).Usable from release: KULI 9.1-0.01