چكيده به لاتين
About two-thirds of the fuel energy in the internal combustion engines is lost through exhaust smoke and the cooling system. Usually due to the low input (absorption) of this waste heat, a small amount of this waste energy is recovered in the recovery system (especially from low temperature sources) and the low efficiency of the recovery system.
In this work, two strategies are proposed to increase the heat recovery from the internal combustion engine. In the first strategy, an innovative approach is presented to improve the efficiency and performance of the Rankin cycle. What distinguishes this solution is that in addition to increasing system efficiency, it enables the recovery of two different heat sources of the same quality at the same time. But this solution made little improvement on the efficiency of the system compared to the recovery capacity of the system. But the main and successful idea of this work is to provide a strategy to increase the waste energy absorption in the recovery system implemented by the inorganic low-temperature Rankin cycle strategy. In this solution, by increasing the input energy to the system, the output of the system increases with the same efficiency. One of the strengths of this system is the achievement of the amount of work from the heat dissipation of the cooling system by the Rankine cycle.
In this work, with a holistic view of the system structure, the thermodynamic model and the thermal transfer used to investigate these systems, the model was coded by MATLAB and Excel software. Then the proposed structures were evaluated and their results presented. It somehow presents a process of structural evolution to achieve the ultimate structure. In this work, by reviewing the literature, the boundary conditions of the system are identified and the proposed operating conditions of the system are determined. Then, using the model developed, the proposed structures were investigated. Finally, by optimizing the best operating conditions of the final system, it was calculated and presented.
Since there was no preliminary test information in the design of this system and the steps and methods of designing such a system were unclear, by simplifying the model and preliminary analysis, the idea presented was briefly reviewed and the initial thresholds required The design of a system was determined, and an algorithm was also proposed and developed for a thermal recovery system of an internal combustion engine.
