I am experimenting with different ways to heat up and cool down a peltier to a specific setpoint. Heating up the peltier to a setpoint using a PID has been relatively simple, and right now I am working on optimizing the speed of cooling it down.
My design right now is to use a DPDT relay to flip the polarity, and reversing the PID. This seems to work well in theory, but I have concerns that the rapid temperature difference might hurt or break the peltier over time (like running cold water over hot glass). Does anyone know if this concern is valid? If it is, does anyone have any advise on how quickly I can cool down the peltier without damaging it?