Transient behavior of square pulsed supercooling for TE devices

Based on a numerical solution involving time-dependent imposed square voltage pulse and time-dependent thermal boundary conditions, the transient supercooling behavior was theoretically analyzed, as well as the response to the pulse operation parameters during the periods of pulse start-up, pulse-on time and pulse-off time, which was served as a theoretical basis for exploiting the coupling interaction of the thermoelectric effects(Peltier cooling effect, Joule heating effect and Fourier thermal effect) on the heat diffusion in the short time scale. The results indicate that, the transient thermoelectric supercooling effect can be enhanced by keeping on increasing the Peltier cooling effect as the additional cooling capacity for a period long enough against the earlier arrival of the excessively the Joule heating effect and Fourier heat conduction effect arriving at the cold junction, in which a transient cold spike can be produced by superimposing an additional shaped voltage pulse of the reasonable range on the original steady-state optimum value. The discussions may not only facilitate to put forward the theory basis for the optimization control strategy on pulse mode, but also develop a new method of transient supercooling effect for application in TE devices.