Cumulative Phenomena in Micro-porous Body of Thermoelectric Materials

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A cumulative thermoelectric conversion phenomenon has been discussed in the permeable porous body consisted of thermoelectric materials and a theoretical study is also developed based on analytical model pertinent to the preceding system. Four kinds of different configuration modules have been fabricated and tested to cool the upstream side cold junctions by combustible premixture and, thereafter, to heat around the downstream side hot junctions of modules by mean of combustion.(1) Alumel-Chromel thermocouples embedded in matrix shape ceramics. (1mm-dia*1600 pairs in 100*100 mm^2matrix, 1.25mm pitch, 13,25mm thickness).(2) Alumel-Chromel foiled shape thermocouples combined with electric insulator sheets (50*50mm^2,200pairs).(3) A genuine thermoelectric module of porous structure fabricated by sintering of Alumel-Chromel particles (10*10mm^2element*64pairs, 16mm thickness).(4) A thermoelectric element of porous structure fabricated by sintering of Fe-Si particles (not successful for modulization).The expected results have been obtained regarding the modules of (1) and (2), though the configuration of porous structure is not ideal. The connecting modulization technology has not been basically overcome for the genuine porous module consisting of particle-sintered elements. However, some important data have been exploited such as effective thermal conductivity, permeability of porous element which enable us to evaluate the thermoelectric module optimum design by theoretical procedures. The theoretical model is extended to calculate the COP of porous module for heating/cooling system, the results of which showed some excellent characteristics in the reversed conversion from electric energy to heat.