The energy harvesting from waste heat

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The energy harvesting from waste heat ( the-energy-harvesting-from-waste-heat )

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World Scientific News 48 (2016) 133-148 maximum temperature that the device can achieve is 600 °C). On each of the walls of the simulator exhaust accounted for less than 125W. The efficiency of one cell is thus approximately 5%. It is also worth to pay attention to the fact of insufficient energy recovery. Although the warm air in the simulator pipe had a maximum temperature of about 220 °C, in reality the same temperature of exhaust simulator have never exceeded 70 °C. Installation of cells directly on the exhaust is hardly effective due to the fact that the tiles located closer to the heat source will produce significantly more energy than those located further away, because there is much cooler. Another problem is the uneven distribution of heat on the cell. This causes that in fact most of the current produce the center of a tile and its side portions much less. This phenomenon is shown in Fig. 4. The color red indicates the places where is the most heat. Figure 4. Distribution of heat inside the exhaust simulator - cross section (own work) Specification of the cell operation comes down for application it in a place where there is a large temperature range. In vehicles with internal combustion engine it can therefore be mounted for example near the following places:  exhaust system,  cooling system,  engine. For the needs of study, as exemplary vehicles, in which is possible to mount the cell, the city bus and long-distance bus were selected, and a vehicle exhaust system was selected as a place of assembly. The data of the quantity of power absorbed by the receivers, the amount of power produced by the cell and data of engine and alternator efficiency of vehicle were needed to simulate the assembly of the cell. There was simulated the installation of cells recovering heat energy in the city bus Volvo 7000K and long-distance bus Van Hool Altano TDX27. -142-

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