By varying the input current from zero to maximum, one can adjust and control the heat flow and temperature differential. Modules can be mounted in parallel to increase the heat-transfer capacity, or they can be stacked in multistage cascades to increase the temperature differential. Thermoelectric modules have no moving parts, so they are virtually maintenance free. They are also smaller and lighter than comparable mechanical cooling systems. Their solid-state construction ensures high reliability, which is an advantage when they are to be used in a system that is not easily accessible after installation.
Operation is acoustically silent, and electrical interference is negligible.
For most applications, a standard module will be satisfactory, but custom designs are readily available. These answers should yield enough information about the system in which the module is to be installed to permit module selection. Since module performance is often presented graphically, it is important to know how to use these graphs to determine which module is appropriate for your system. These data allow the user to determine whether the module under consideration has sufficient heat-removal capacity to meet the application requirements. I A graph of V in vs.