Experimental investigation of thermoelectric generator (TEG) with PCM module

Highlights: • An experimental set-up for thermoelectric generator (TEG) was made. • Phase change material (PCM) was used for cooling of one side of TEG. • Performance characteristics in different electrical and thermal configurations were determined. • It was proven that PCMs can be effectively used as both heat sink and heat source in TEGs. - Abstract: In the paper, the results of experimental investigation of thermoelectric generator (TEG) are presented. The model of TEG was designed for the use of solar radiation as a heat source. An important feature of the design under study is the method of cooling of thermoelectric modules. Phase change material (PCM) absorbs heat during its melting, thus stabilizing temperature of the cool side of TEG. Basic performance characteristics, i.e. voltage and current generated vs. time, were measured during tests conducted for different electrical configurations of the unit, and for different heat fluxes on hot side of TEG. Temperature distributions in PCM container during the operation of TEG were also recorded. The reverse operation of TEG, i.e. when heat earlier accumulated in PCM is utilized, was tested as well. The results confirmed the potential of the application of phase change materials as a cooling/heating media in TEGs.