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World Scientific News 48 (2016) 133-148 Low beam - front 2*55 W, Low beam - rear 2*10 W, Brake - 4*40 W, Lighting registration – 2*5 W, Indoor lighting – 25*30 W, The injection system – 50 W, Car radio and sound system – 400 W, The monitoring system - 100 W, The locator – 5 W, Displays type of Pixel" - 20 W, The power used by passengers - 5*50 W = 250 W, Router with Wi-Fi - 20 W. Assuming that two cells allow to produce about 1,35 W of power. To power the entire bus is necessary to use about 2689 units of cells with a total weight of more than 53kg. In the case of retail prices cells about 20 PLN, the cost of cells would be around 53778 PLN. To calculate saved fuel by the vehicle, it was assumed that the efficiency of the alternator in a vehicle is 95%. It has been calculated that if the vehicle's engine will run under a load of all of the electrical appliances for one hour, it will consume approximately 13,75 MJ. A liter of diesel fuel has a calorific value of around 43 MJ. So the engine consumes about 319,90 ml of fuel for vehicle lighting only within an hour. Assuming that the vehicle will travel along the route at an average speed of 70 km/h, the 1 km you it will burn about 4,57 ml of fuel for 1 km. If the bus would move without any major failures in the within a year, thanks to the use of cells, the carrier could save about 5028 PLN. In order the cost of cells could return, the bus should drive in the company's fleet of the similar annual mileage of kilometers for about 11 years. 4. CONCLUSIONS Based on the analysis of the possibility of using the Peltier cells in buses it can be concluded that at the current price of one unit of the cell, the use of this solution is not fully economically justified. However, there are possible solutions that could increase the efficiency of the cell. For example a water tank for heat recovery instead of the cell which is mounted directly on the heat source (for example the exhaust system) can be used. For a better distribution of the heat the exhaust gases can also be used to warm water tank so that each cell would be heated equally. It should be also examine the justification for applying the cells with higher heat resistance, which can provide more power. Besides being economically beneficial an advantage of using cells is to reduce the vehicle's engine wear and emission of harmful substances into the environment. The conducted calculations show that the most justifiable is the installation of cells in vehicles equipped with multiple electric receivers with low efficiency of the engine. Thermoelectric devices for energy recovery can be used to power small devices such as wifi, sensors, watches. More and more new thermoelectric materials that provide efficient and cheap energy generation on a large scale are looked for [11-16]. In the Google Patents database and in Espacenet there are many solutions relating to waste heat recovery, which -146-PDF Image | The energy harvesting from waste heat
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