Cumulative Phenomena in Micro-porous Body of Thermoelectric Materials

本文讨论了由热电材料组成的可渗透多孔体中的累积热电转换现象，并在此基础上建立了相应的分析模型，进行了理论研究。四种不同结构的模块已被制造和测试，以冷却的上游侧冷端的可燃预混合物，然后，通过燃烧加热模块的下游侧热端周围。(1)镶嵌在基体形状陶瓷中的镍铬热电偶。（1 mm直径 *1600对，100*100 mm^2矩阵，1.25 mm间距，13.25 mm厚度）。(2)带电绝缘片的镍-铬箔形热电偶（50* 50 mm ^2，200对）。(3)一个真正的热电模块的多孔结构制造的烧结铬镍-铬镍颗粒（10* 10毫米^2元件 * 64对，16毫米厚）。(4)通过烧结Fe-Si颗粒（模块化不成功）制造的多孔结构热电元件。关于（1）和（2）的模块，虽然多孔结构的构型不理想，但获得了预期的结果。对于由颗粒烧结元件组成的真正的多孔组件，连接模块化技术尚未基本克服。然而，一些重要的数据，如有效的导热系数，渗透性的多孔元件，使我们能够评估热电模块的优化设计的理论程序。将该理论模型推广应用于制冷/制热系统中多孔组件的COP计算，结果表明该模型具有良好的电-热逆向转换特性。

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.