As a result of the analysis of the research results, it is easy to see that the voltage at the output of our electrothermal generator increases with increasing temperature difference between the surface of the heating system pipe and the aluminum air cooling radiator, between which are Peltier elements. However, the efficiency of such a generation is much lower than the efficiency indicated in the development guides of the corresponding model of the Peltier element (Appendix B). The reason for this is, obviously, the negative impact of the applied structural elements of the created model, which reduce the efficiency of heat transfer between the source of the temperature difference and the Peltier element. The step-up voltage converter used in the created model allows to receive necessary for power supply of useful devices of 5 V of a voltage on an output of the generator, but according to the parameters, this device needs a certain (though rather small) voltage on the input. In the study without load, we were able to obtain at the output of the converter 5 V standard voltage at a temperature difference ΔT = 16.1 ° C. Instead, in the second study, when the output of the converter was used as a source for the cooling fan, the required 5 V was achieved only at ΔТ = 23.2 ° С. This temperature difference is easily achieved by the surface of the heating radiator and the air of the living space during the heating season. That is, a generator based on four Peltier elements TPP 1 - 12706 will really be able to produce the required amount of electricity to power useful devices and charge mobile devices. Of particular interest is the result of a study of the efficiency of active air cooling, powered by the output of our generator. As we can see, the voltage at the Peltier elements under the conditions of the current at the generator output (Fig. 4, dependence 4) is noticeably lower than that in the case of the no-load experiment (Fig. 4, dependence 1). But only until the step-up converter can provide a voltage of 5 V (Fig. 4, dependence 3 has a jump near ΔT = 23.2 ° C) to power the fan active cooling radiator! After that, the active cooling fan is switched on and the generation efficiency becomes higher than that during the idling study. This means that the use of active cooling of the radiator makes sense in such devices. The scientific novelty of the work is to confirm the possibility of creating a heat generator using as a source of energy available in everyday life temperature difference, in particular, obtained the characteristics of the modern Peltier element. The practical significance of the work lies in the possibility of using the device at home when using a heated battery to obtain electricity that can be used to connect a flashlight, humidifier, charge the fitness bracelet.
Experimental study on vibration of air cooling fan bridges
