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World Scientific News 48 (2016) 133-148 the catalyst and used by termoelectric (Snyder 2008). Great potential using of waste heat gives cogeneration of energy. It is a technological process simultaneous production of electricity and useful heat. Due to lower fuel consumption, the use of cogeneration gives great economic savings and is beneficial in ecological terms. In the cogeneration of electricity and heat, electricity is produced with almost 100% efficiency, because the remaining energy is used for heating. It seems preferable to use thermoelectrics in cogeneration for home, due to quieten, no vibration and no maintenance. Cogeneration of electricity in homes and recovery of waste heat from cars are two examples where "small" systems could have an impact on global energy consumption if they are implemented on a large scale (Snyder 2008). Thermoelectrics enable the collection of a very small amount of heat for low-power applications such as wireless sensor networks, mobile devices and for medical applications because they are smaller and lighter than conventional batteries. An example of the thermoelectric energy generation is a wristwatch. The watch is powered by body heat converted into electricity by thermoelectric. Under normal operating conditions using thermoelectric modules the watch generates 22 uW of electricity with only 1.5K temperature drops. The use thermoelectrics is justified here, because the production costs of these devices fall in series production, and in the view of the increasing demand for remote power sources, such the real applications will undoubtedly arise (Snyder 2008). In study [9,10] the use of the thermoelectric generator for converting thermal energy of the human body into electricity were discussed. The proposed thermoelectric generator composed of polydimethylsiloxane (PDMS), substrate and thermocouple. The use of PDMS ensured the flexibility of the thermoelectric generator and a low thermal conductivity which helps to minimize heat losses flowing through the thermocouple. Thermoelectric generator was attached to the human body, generating electricity of 50 NW, when the temperature difference between the human body and the environment was 7 °C (Jo, et al. 2012, Mahalakhsmi et al. 2014). 3. THE POSSIBILITY OF USING PELTIER CELLS IN MUNICIPAL AND LONG-DISTANCE TRANSPORT The research on the possibilities of mounting Peltier cells in the municipal and long- distance transport services were conducted. The aim of the study was to evaluate the possibility of reducing fuel costs by obtaining electricity from the Peltier cells instead of the alternator. The following devices were used in the research: exhaust simulator (ejector, radiator, Peltier cells, water temperature and gas sensors in the pipe), electric pump with a power of 50W, oscilloscope with instrumentation, adjustable heat source (heat gun for wood with a power of 1000W). The tests of operation efficiency of Peltier cells were conducted on the basis of which it was possible to determine the amount of recovered energy through their use. Measurements were performed at room temperature (about 20 °C). It begins after running the heater and setting the temperature on 100 °C. After 20 min, a first measurement result were obtained -140-PDF Image | The energy harvesting from waste heat
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