Best Ideas 2021 features all the nominated entries submitted under ‘Submit your Idea’ category. All the entries consist of innovative solutions or propositions for an enterprise that champions the Sustainable Development Goals. They can be on the conceptual, planning, or start-up stage.

Thermionic converter of special triode type

Published on August 13, 2021 um 09:32

Explain your idea in details:

Thermoemission power converters have two major problems. Finding the material with the lowest possible value output work and a way to suppress the space charge. The proposed solution aims to suppress the effect of space charge charge by using a triode with a positive grid voltage. To reduce the parasitic grid current, the use of two asymmetrically placed grids between which the positive voltage is switched very quickly. This should improve the regular distribution of moving electrons in space, increase the proportion of electrons incident on the collector and reduce grid current. The voltage and frequency on the grid must be optimised experimentally so that the ratio of the grid and collector current to be as low as possible or to achieve maximum overall efficiency. My estimate is 20 to 100 V and 0.1 to 3 MHz. Since this is a thermal machine the efficiency is limited by the Carnot cycle. It is desirable to achieve the highest the emitter operating temperature and a low collector temperature. The collector must therefore be cooled. A solar collector can be used as a heat source energy or combustion of almost any fuel. The residual heat can be further used. The principle scheme is shown in the attached figures. The grids should be placed as close to the collector as possible and a high frequency alternating current generator should be used. The generator need not be of high quality, some white noise may be desirable. Another question is whether it will a sinusoidal or rectangular voltage waveform on the grid is preferable.

Expected impact of your idea on sustainable development

Thermionic converter has no moving parts and thus can have a long service life. It is completely silent. The problem is what material to use for the emitter and collector. Here we can use the experience from earlier experiments. Previous solutions had a conversion efficiency of up to 15%, the efficiency of the proposed solution can only be determined by experiment. It can be used for direct conversion of solar radiation into electrical energy using a parabolic mirror or for powering various vehicles by burning almost any fuel in combination with an electric battery. Or also as a pre-stage to the boiler of conventional steam power plants. The disadvantage is the need to use an auxiliary power supply to power the high-frequency generator, but this can be identified with the battery mentioned above. It is actually similar to starting an internal combustion engine.

Plans for implementation and sustainability

I have no plans in that direction. I have no experience in business and at my age I don't have the strength to start in this field.

Your profile

I am 70 years old, I studied physical chemistry at the faculty of natural science, but I have basically not worked in this field. About half of my professional life I worked as a programmer, the other half as an economist with a focus on budgets and calculations. I have been retired since the age of 63 and have pursued my hobbies of science, technology and inventing. Unfortunately only to the idea stage as I don't have the resources, capabilities or connections to test the functionality and quality of these ideas. Since I don't have many years left to live, I decided to submit these ideas to this contest where they can serve directly or as inspiration for other solutions. These ideas are mainly in the area of energy conversion.

Stage of Idea

conceptual stage, idea offered for implementation by others

Picture upload

Picture upload

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