Evaluation of the energy recovery potential of thermoelectric generators in diesel engines

Abstract

Thermoelectric generation is an alternative to recover some of the wasted energy trough an exhaust of the internal combustion engines. This paper assesses the performance of a thermoelectric generator with 20 modules by implementing a waffle heat exchanger. Experimental results showed a variable range of power recovery from 57.87 W to 71.13 W for B10, B5, and Diesel. The highest energy conversion efficiency of the aforementioned thermoelectric device was of 3% with the highest load and the fastest rotational speed. Also, the recovery process reduced gaseous emissions such as CO, CO2, NO, NOX, and HC. Additionally, the smoke opacity per kWh is reduced at significant levels of operations such as 2.42% when using diesel, 2.65% when using B5 and 3% when using B10. However, when using biodiesel blends, NOx emissions were increased. Overall the biodiesel resulted in a higher power recovery performance versus the diesel.

Economic and Exergo-Advance Analysis of a Waste Heat Recovery System Based on Regenerative Organic Rankine Cycle under Organic Fluids with Low Global Warming Potential

“…However, due to the high contamination rates, environmental protection has been chosen as the main criterion, and numerous investigations report the negative impact on the atmosphere of the chlorofluorocarbon (CFC), which makes the selection of the working fluid for the ORC a complex task [17]. Therefore, different methods have been established in ICE to achieve greater energy efficiency with less environmental impact such as waste to energy technologies based on the ORC cycle operating with environmentally friendly fluids [18]. Thus, better efficiency in the Jenbacher gas engine JMS 612 GS-N.L, can be achieved by waste heat recovery using the ORC [19].…”

“…Direct costs are the expenses that correspond to the purchase of equipment, pipes, the instrumentation, the installation and assembly, and electrical components and materials related to the civil work system and work area. Equations (18) to (20) were used to estimate the acquisition cost of the devices. In this case, correlations were used for each of the equipment in terms of its energy, as is the case for the turbine and pump, and in terms of the heat transfer area, which collect data from constructers and calculate the costs.…”

“…In this case, correlations were used for each of the equipment in terms of its energy, as is the case for the turbine and pump, and in terms of the heat transfer area, which collect data from constructers and calculate the costs. For the turbine, the costs were estimated by means of Equation (18) [18,26].…”

Effect of the Geometric Profile of Top Ring on the Tribological Characteristics of a Low-Displacement Diesel Engine

“…The interaction between the piston rings and the cylinder liner in internal combustion engines is one of the processes of great relevance for the proper functioning of the engine since this has an effect on oil consumption, fuel consumption, losses due to friction, polluting emissions and performance [1][2][3][4][5]. According to the investigations carried out, the losses due to the friction between the contact of the piston rings and the cylinder chamber represent between 26%-49% of the total losses [6][7][8][9].…”

Thermo-Economic Assessment of a Gas Microturbine-Absorption Chiller Trigeneration System under Different Compressor Inlet Air Temperatures

“…The increase in global warming, adding to the scarcity of fossil fuels, has motivated the development of new technologies to improve the efficiency of existing processes in power plants [1,2]. Among the available options, multi-generation processes such as the trigeneration cycle have been widely used as they allow for greater efficiency, lower costs, and reduced emissions [3].…”