PORTABLE THERMOELECTRIC GENERATOR MODEL ELECTRIC ENERGY FOR THE FAR NORTH

Objectives The aim of the study is to develop a model of a portable thermoelectric generator (TEG), designed to operate at low ambient temperatures, the study of thermophysical processes occurring during its operation.

Method A thermal model of TEG for the conditions of the Far North was created, in which five main blocks are distinguished: a heat source (human), heat accumulators, TEG implemented by a certain number of thermoelectric batteries (TEB) connected in series, heat pipes and a radiator system for intensifying heat transfer cold junctions of thermopile elements with the environment, on the border of which there are boundary conditions of the 2nd and 3rd kind. Based on the thermal model, a mathematical model of the device has been developed, which includes solving the problems of calculating the heat conduction, melting and solidification of the working substance in a heat accumulator; an electric energy generator based on a thermoelectric converter.

Result The dependency graphs are obtained, reflecting the main characteristics of the developed system, in particular, the dependence of the change in the emf on the temperature difference between the TEG junctions at various coefficients of heat exchange with the environment, efficiency TEG from thermo-emf.

Conclusion As follows from the obtained data, the value of the generated emf directly related to the temperature difference between the TEG junctions, and the higher the value of the latter, the higher the emf value The direct dependence of the emf is also evident. and values of heat transfer coefficients with the environment. From the graphs presented, we can conclude that to obtain a larger value of the generated emf it is necessary to select a heat accumulator with the highest possible temperature and heat of fusion. C.p.d. generator decreases with increasing generated emf Under the conditions of a numerical experiment, the maximum value of the efficiency amounted to slightly less than 8%. It is advisable to use heat pipes as heat conduits because of the minimum heat loss along their length, and crystalline sodium sulfate, crystalline sodium carbonate, and paraffin as heat accumulators. 

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